300+hp 305 Has it been done?
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300+hp 305 Has it been done?
Ok well i did some figuring and a mustang gt 4.6l puts out 300 hp and 320lbft Which would be about 65 hp/Liter and 69 ft lb/ Liter.
While the 5.0l tpi(1987) puts out about 190 hp and 295 lbft. Which would be about 38 hp/Liter and 59 lbft/Liter.
Is it possible to make a 305(without boost) make 325 HP and 345 lbft?
This would be the same amount of power/displacement as the GT.
Just wondering its an odd goal of mine but the way i see it if they can make it that efficient why cant i? Or has it been done?
While the 5.0l tpi(1987) puts out about 190 hp and 295 lbft. Which would be about 38 hp/Liter and 59 lbft/Liter.
Is it possible to make a 305(without boost) make 325 HP and 345 lbft?
This would be the same amount of power/displacement as the GT.
Just wondering its an odd goal of mine but the way i see it if they can make it that efficient why cant i? Or has it been done?
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Car: 1983 G20 Chevy
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Re: 300+hp 305 Has it been done?
Ok well i did some figuring and a mustang gt 4.6l puts out 300 hp and 320lbft Which would be about 65 hp/Liter and 69 ft lb/ Liter.
While the 5.0l tpi(1987) puts out about 190 hp and 295 lbft. Which would be about 38 hp/Liter and 59 lbft/Liter.
Is it possible to make a 305(without boost) make 325 HP and 345 lbft?
This would be the same amount of power/displacement as the GT.
Just wondering its an odd goal of mine but the way i see it if they can make it that efficient why cant i? Or has it been done?
While the 5.0l tpi(1987) puts out about 190 hp and 295 lbft. Which would be about 38 hp/Liter and 59 lbft/Liter.
Is it possible to make a 305(without boost) make 325 HP and 345 lbft?
This would be the same amount of power/displacement as the GT.
Just wondering its an odd goal of mine but the way i see it if they can make it that efficient why cant i? Or has it been done?
You can make the power numbers you are looking for with TBI if you are so inclined.
#3
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Car: 1991 Firebird
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Re: 300+hp 305 Has it been done?
VERY EASILY.....With the advent of Vortec heads and aggressive grind roller cams it is vey possible. Honestly the GT is WEAK for a 4.6 liter engine. Chrysler is making more power and torque per liter displacement out of their 4.7 engine in the 2008+ trucks.
You can make the power numbers you are looking for with TBI if you are so inclined.
You can make the power numbers you are looking for with TBI if you are so inclined.
Whats the cheapest it could be done for?
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Re: 300+hp 305 Has it been done?
300 hp out of a 305? i'd like to do that to my LB9... subscribing!
#5
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Re: 300+hp 305 Has it been done?
you can get good power out of a 305, its really not that hard, you can go with new heads, cam, porting the intake, a full exhaust, a nice rear axle ratio etc.
I started with exhaust, i went with Edelbrock TES headers/ypipe, 3 inch all the way back, really woke it up over the stock alternative, and also a rear axle ratio swap helps ALOT with the torque. Once you get into swapping heads/cam and possibly porting your intake those numbers are easy to hit.
Anything is possible with the right amount of $.... and you can throw that same $ at a 350 and make even higher numbers with the parts listed.
I started with exhaust, i went with Edelbrock TES headers/ypipe, 3 inch all the way back, really woke it up over the stock alternative, and also a rear axle ratio swap helps ALOT with the torque. Once you get into swapping heads/cam and possibly porting your intake those numbers are easy to hit.
Anything is possible with the right amount of $.... and you can throw that same $ at a 350 and make even higher numbers with the parts listed.
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Re: 300+hp 305 Has it been done?
Subscribed!
I was interested in doing something like this as well. Looked into Vortec heads from Edlebrok and one thing to remember. If you go vortec style heads and want to keep the TPI then you will need a new TPI base made for the Vortec heads. Otherwise go with a TBI off of a newer vortec motor.
I hope to do my potent 305 vortec/tpi build this next winter (god willing). I get so sick of the 'do a 350' jabbs... I want people to flip when they find out its a 305 smoking them.
I was interested in doing something like this as well. Looked into Vortec heads from Edlebrok and one thing to remember. If you go vortec style heads and want to keep the TPI then you will need a new TPI base made for the Vortec heads. Otherwise go with a TBI off of a newer vortec motor.
I hope to do my potent 305 vortec/tpi build this next winter (god willing). I get so sick of the 'do a 350' jabbs... I want people to flip when they find out its a 305 smoking them.
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Re: 300+hp 305 Has it been done?
As much as id like to share your enthusiasm its never going to happen. Dollar for dollar the money you put into a 305 could go into a 350 and make completely different numbers, yeah you may take out a stock iroc, but that's it at best. Not trying to be a damper or flame you but that's just unrealistic. The reality is displacment is key, you can only push a build so far and as time has shown the 305 will forever be over shadowed by its 350 counter part. Say for example you've got a 305 pushing 200hp, throw some underdrive pulleys on and you gain 10hp( just an example not accurate numbers). Your neighbor has a 350 and puts the SAME pullies on, guess what...he's stiiiiill faster they just have a better margin on our powerband and numbers
In any case, for those who want to have a good 305 build the key to getting new parts (heads, cam, intake etc) is going to be using parts that compliment each other, go to your local shop and get the numbers, flow test parts, whatever, its all about research and finding the parts that work well together, you can have a brand new set of heads, incredible numbers...match them with a crappy intake and you'll shoot yourself in the foot. My number one piece of advice is RESEARCH before you go click insane on summit and jegs, no sense in throwing down hard earned money on parts that are gonna fight each other
In any case, for those who want to have a good 305 build the key to getting new parts (heads, cam, intake etc) is going to be using parts that compliment each other, go to your local shop and get the numbers, flow test parts, whatever, its all about research and finding the parts that work well together, you can have a brand new set of heads, incredible numbers...match them with a crappy intake and you'll shoot yourself in the foot. My number one piece of advice is RESEARCH before you go click insane on summit and jegs, no sense in throwing down hard earned money on parts that are gonna fight each other
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Re: 300+hp 305 Has it been done?
Vortec heads have a different intake bolt pattern which will not accept the stock TPI base, and the only company that made a compatible base is Scoggins Dickey as far as I know (very pricey). Besides, from what I've read the Vortec chambers are too large to for a 305 and I doubt the valves will clear the smaller dimensions
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Re: 300+hp 305 Has it been done?
Vortec heads have a different intake bolt pattern which will not accept the stock TPI base, and the only company that made a compatible base is Scoggins Dickey as far as I know (very pricey). Besides, from what I've read the Vortec chambers are too large to for a 305 and I doubt the valves will clear the smaller dimensions
I believe edelbrock offers a tpi base, don't wquote me on that tho birdtojag picked up one for his firebird and matched it with a set of edelbrock runners, it will accept the factory runners too tho
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Re: 300+hp 305 Has it been done?
Edit: Edelbrock makes a hi-flow base, I've never seen one to adapt the TPI to a 96+ Vortec head. Not trying to be rude, and if you have a link PLEASE let me know. I really want to build a 385/TPI/Vortec setup for Fathers car
Last edited by hoogiesngrinder; 09-08-2010 at 04:10 AM.
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Re: 300+hp 305 Has it been done?
Yup Edelbrok sells a TPI base for Vortec heads.
Last edited by Banksy; 09-08-2010 at 04:10 AM.
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Re: 300+hp 305 Has it been done?
As much as id like to share your enthusiasm its never going to happen. Dollar for dollar the money you put into a 305 could go into a 350 and make completely different numbers, yeah you may take out a stock iroc, but that's it at best. Not trying to be a damper or flame you but that's just unrealistic. The reality is displacment is key, you can only push a build so far and as time has shown the 305 will forever be over shadowed by its 350 counter part. Say for example you've got a 305 pushing 200hp, throw some underdrive pulleys on and you gain 10hp( just an example not accurate numbers). Your neighbor has a 350 and puts the SAME pullies on, guess what...he's stiiiiill faster they just have a better margin on our powerband and numbers
In any case, for those who want to have a good 305 build the key to getting new parts (heads, cam, intake etc) is going to be using parts that compliment each other, go to your local shop and get the numbers, flow test parts, whatever, its all about research and finding the parts that work well together, you can have a brand new set of heads, incredible numbers...match them with a crappy intake and you'll shoot yourself in the foot. My number one piece of advice is RESEARCH before you go click insane on summit and jegs, no sense in throwing down hard earned money on parts that are gonna fight each other
In any case, for those who want to have a good 305 build the key to getting new parts (heads, cam, intake etc) is going to be using parts that compliment each other, go to your local shop and get the numbers, flow test parts, whatever, its all about research and finding the parts that work well together, you can have a brand new set of heads, incredible numbers...match them with a crappy intake and you'll shoot yourself in the foot. My number one piece of advice is RESEARCH before you go click insane on summit and jegs, no sense in throwing down hard earned money on parts that are gonna fight each other
Very true. But for those of us not looking to blow the doors of a viper, and don't want to do a complete engine swap. It's possible, through proper research and planning to build a potent 305.
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Re: 300+hp 305 Has it been done?
yeah i just found it on their site, P/N 3817 but like stated above putting 350 vortecs on a 305 is a dangerous move,
and my build istn gonna blow doors off any vipers, i just went for the 350 because theres more room for improvement later on, and im sick of 305's to be totally honest, but that just me, and if youre gonna be increasing the power output of your 305, im willing to bet its old and a bit tired out, you'll have to pull the entire motor anyway to rebuild it to hold up to the new goodies, so you can just build a seperate motor while still running on the 305 lol thats what sold me, and i got a free L98 block....so i couldnt exactly say no i wanna keep my 305, i just put the money into mine because i didnt have the money for a 350
btw im done jacking this thread lol im startin to feel bad for wammac
and my build istn gonna blow doors off any vipers, i just went for the 350 because theres more room for improvement later on, and im sick of 305's to be totally honest, but that just me, and if youre gonna be increasing the power output of your 305, im willing to bet its old and a bit tired out, you'll have to pull the entire motor anyway to rebuild it to hold up to the new goodies, so you can just build a seperate motor while still running on the 305 lol thats what sold me, and i got a free L98 block....so i couldnt exactly say no i wanna keep my 305, i just put the money into mine because i didnt have the money for a 350
btw im done jacking this thread lol im startin to feel bad for wammac
Last edited by BluFBdy; 09-08-2010 at 04:17 AM.
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Re: 300+hp 305 Has it been done?
They made a 305 vortec. Kinda hard to find and dont know how good the heads were on them.
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Re: 300+hp 305 Has it been done?
Oh, and 305 Vortec heads aren't even close to the 96+ Vortec heads. Should have mentioned that earlier. Sorry :/
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Car: 95 Z85 S10, 99 Formula
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Re: 300+hp 305 Has it been done?
"In 99 they did an in depth dyno test on a 305 with over 80k.
Step 1, had dyno readings just headers.
Step 2, added Edelbrock Performer gained 20 hp.
Step 3,changed to 750 holley w/no chg in hp.
Step 4, Added Comp Cams XE262H-10 "Xtreme Energy" gained 53 hp.
Step 5, Chgd heads to World Products 305 S/R Torquer made 300 hp.
Step 6, Changed heads to Vortec GM P/N 12558060. and got 325 HP from a stock 80k 305."
Step 1, had dyno readings just headers.
Step 2, added Edelbrock Performer gained 20 hp.
Step 3,changed to 750 holley w/no chg in hp.
Step 4, Added Comp Cams XE262H-10 "Xtreme Energy" gained 53 hp.
Step 5, Chgd heads to World Products 305 S/R Torquer made 300 hp.
Step 6, Changed heads to Vortec GM P/N 12558060. and got 325 HP from a stock 80k 305."
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Re: 300+hp 305 Has it been done?
there was an article in 93, in the carcraft magazine about the 305/350 tpi engines.
clains that only changing headers, cam, and intake runners you get "just over 300 hp and 380 lbs.-ft torque.I tried to post the article but it wont let me for some reason.
clains that only changing headers, cam, and intake runners you get "just over 300 hp and 380 lbs.-ft torque.I tried to post the article but it wont let me for some reason.
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Re: 300+hp 305 Has it been done?
i believe with the right parts it can be done, in the late 60s early 70s the chevy 302 that was used in races was a friggin beast
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Re: 300+hp 305 Has it been done?
This topic really gets beat to death on a weely basis. Doing a search will yeild about a million threads that have been started.
The basics of it are....
Yes it is possible.
Yes, you can make more power with a 350, or a 383, or a 400, are a 454... (get the hint, theres always a bigger motor)
F1 engines were making near, or over, 900 horsepower with a 3 litre V10. Anything is possible.
The basics of it are....
Yes it is possible.
Yes, you can make more power with a 350, or a 383, or a 400, are a 454... (get the hint, theres always a bigger motor)
F1 engines were making near, or over, 900 horsepower with a 3 litre V10. Anything is possible.
#24
Re: 300+hp 305 Has it been done?
They might have one, but I would NEVER put 350 Vortec heads on a 305.
Edit: Edelbrock makes a hi-flow base, I've never seen one to adapt the TPI to a 96+ Vortec head. Not trying to be rude, and if you have a link PLEASE let me know. I really want to build a 385/TPI/Vortec setup for Fathers car
Edit: Edelbrock makes a hi-flow base, I've never seen one to adapt the TPI to a 96+ Vortec head. Not trying to be rude, and if you have a link PLEASE let me know. I really want to build a 385/TPI/Vortec setup for Fathers car
https://www.thirdgen.org/forums/engi...take-base.html
1.94/1.5 valved heads can will and do work on a 305. This includes the L31 Vortec heads. Search. This has been covered a few times.
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Re: 300+hp 305 Has it been done?
I have a worked up 305. I got the stock motor fresh of a rebuild for $300 with 1000 miles on it. Seeing as how i was in college and had very little money that was all i could afford. So i swaped on some alum l98 heads, bigger cam, new exhaust. It moves to say the least. I ran 14.8 on crap street tires and horrible 60'. Not to mention i recently changed the ignition coil and what a difference that made. Also thats on the stock tune. I believe once i get it tuned properly i dont see why i couldnt be low 14s or high 13s with better tires.
go for it. pm me if you want some more details on my build. I am happy with it for now, once i get a real job and some money im doing the lsx swap.....
go for it. pm me if you want some more details on my build. I am happy with it for now, once i get a real job and some money im doing the lsx swap.....
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Re: 300+hp 305 Has it been done?
does anyone on this site know how to search?
its not like this hasnt been discussed 15 times a week for the last 20 years....
its not like this hasnt been discussed 15 times a week for the last 20 years....
#27
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Re: 300+hp 305 Has it been done?
Here is the basics....
1980 C10 Truck...4,500 lbs with driver and passenger
312 CID....Flattop pistons....059 Vortecs with porting a 1.94/1.60....Crane 272H10 cam advanced 4*, GMPP Vortec intake, Q-Jet carb, L30/L31 shorty headers, 2 1/2" duals, 2,600 stalled TH 350, and highway gears with 29.5" tall tires.
The truck SCREAMS up top.
http://www.youtube.com/watch?v=VxJmvWAlIQQ
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Re: 300+hp 305 Has it been done?
305 Vortec heads are GREAT heads for a 305......In fact for a 305 they are better than the 350 variant....Anyone that says otherwise doesn't know what they are talking about.
Here is the basics....
1980 C10 Truck...4,500 lbs with driver and passenger
312 CID....Flattop pistons....059 Vortecs with porting a 1.94/1.60....Crane 272H10 cam advanced 4*, GMPP Vortec intake, Q-Jet carb, L30/L31 shorty headers, 2 1/2" duals, 2,600 stalled TH 350, and highway gears with 29.5" tall tires.
The truck SCREAMS up top.
http://www.youtube.com/watch?v=VxJmvWAlIQQ
Here is the basics....
1980 C10 Truck...4,500 lbs with driver and passenger
312 CID....Flattop pistons....059 Vortecs with porting a 1.94/1.60....Crane 272H10 cam advanced 4*, GMPP Vortec intake, Q-Jet carb, L30/L31 shorty headers, 2 1/2" duals, 2,600 stalled TH 350, and highway gears with 29.5" tall tires.
The truck SCREAMS up top.
http://www.youtube.com/watch?v=VxJmvWAlIQQ
But, no offense, that truck accelerates like a turd, doesnt seem impressive at all.
#29
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Re: 300+hp 305 Has it been done?
Cell phone video will do that. Take note that it wasn't even floored until around 40 mph...And it is no turd. It runs mid 14s with 3.08 gears. Thats 65 mph @ 6,000 in 1st gear and 105 mph @ 6,000 in 2nd.
Last edited by Fast355; 09-16-2010 at 12:14 AM.
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Re: 300+hp 305 Has it been done?
I love how everyone of these "acceleration" videos, nobody ever has it "floored"....
but like i said, mid 14s is nothing impressive..even if it does weigh 4500 pounds.
#31
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Re: 300+hp 305 Has it been done?
You can listen to the damn movie as bad as the quality is and hear the Q-Jet get slammed on after the truck crosses the intersection.
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Re: 300+hp 305 Has it been done?
For nothing more than it is....Mid 14s is quick for a daily driver truck with non performance tires, highway gears, a 3spd automatic, and a carbureted 305.
You can listen to the damn movie as bad as the quality is and hear the Q-Jet get slammed on after the truck crosses the intersection.
You can listen to the damn movie as bad as the quality is and hear the Q-Jet get slammed on after the truck crosses the intersection.
to each his own, but sorry ,it doesnt impress me.
My grand cherokee runs the same numbers with boltons..
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Re: 300+hp 305 Has it been done?
video of what?
since this is THIRDGEN.org...
heres a video of my formula for the hell of it...
http://www.youtube.com/watch?v=6mUWjTQj2Ps
since this is THIRDGEN.org...
heres a video of my formula for the hell of it...
http://www.youtube.com/watch?v=6mUWjTQj2Ps
#35
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Re: 300+hp 305 Has it been done?
I bet the dual jet carbed 130 hp LE3 305 and 3spd stick NEW in 1980 would have struggled to break a 20 second 1/4 mile and 15 second 0-60 run.
Its all what you use for a comparison.
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Re: 300+hp 305 Has it been done?
A 305 running mid 14s is impressive if you ask me and there aren't too many of them out there. It would be even more impressive in a 3400# thirdgen.
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Re: 300+hp 305 Has it been done?
It would also be more impressive with a 700r4 and 3.73s, even in the same truck. Consider that was the factory setup for many of the L69 cars.
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Axle/Gears: 2.73, 2.73
Re: 300+hp 305 Has it been done?
Yea it is impressive you have a mismatched 1st/rear/motor it would probably run nasty in a 3rd gen with a decent rear and trans. It's certainly a 300+hp long block I think the TPI on there that you dyno'd before showed that.
#40
Re: 300+hp 305 Has it been done?
As much as id like to share your enthusiasm its never going to happen. Dollar for dollar the money you put into a 305 could go into a 350 and make completely different numbers, yeah you may take out a stock iroc, but that's it at best. Not trying to be a damper or flame you but that's just unrealistic. The reality is displacment is key, you can only push a build so far and as time has shown the 305 will forever be over shadowed by its 350 counter part. Say for example you've got a 305 pushing 200hp, throw some underdrive pulleys on and you gain 10hp( just an example not accurate numbers). Your neighbor has a 350 and puts the SAME pullies on, guess what...he's stiiiiill faster they just have a better margin on our powerband and numbers
In any case, for those who want to have a good 305 build the key to getting new parts (heads, cam, intake etc) is going to be using parts that compliment each other, go to your local shop and get the numbers, flow test parts, whatever, its all about research and finding the parts that work well together, you can have a brand new set of heads, incredible numbers...match them with a crappy intake and you'll shoot yourself in the foot. My number one piece of advice is RESEARCH before you go click insane on summit and jegs, no sense in throwing down hard earned money on parts that are gonna fight each other
In any case, for those who want to have a good 305 build the key to getting new parts (heads, cam, intake etc) is going to be using parts that compliment each other, go to your local shop and get the numbers, flow test parts, whatever, its all about research and finding the parts that work well together, you can have a brand new set of heads, incredible numbers...match them with a crappy intake and you'll shoot yourself in the foot. My number one piece of advice is RESEARCH before you go click insane on summit and jegs, no sense in throwing down hard earned money on parts that are gonna fight each other
#41
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 300+hp 305 Has it been done?
Certainly not the first mis-matched setup I have done....This setup is practically identical save the 125 lbs of rolling mass I saved by switching out 32" tall 20s to 17" wheels with 26" tall drag radials (dropping my effective gearing from 3.55 to 4.37!!). I also took out an extra 100 lbs by removing the back seat. The weather was a little cooler. The result, I picked up 7 tenths in the 1/8!!! Thats right, I have been playing with more modern engines lately. I still have the van though, building a 4L80E and a 8.5" 10 bolt with 4.56 gears for it as we speak, then will spray it 125 hp.
9.66
http://www.youtube.com/watch?v=vOKiimp8WwA
8.95
http://www.youtube.com/watch?v=6OjA5nq-BjQ
#42
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Car: 95 Z85 S10, 99 Formula
Engine: 4.3 CPI , LS1
Transmission: NV3500, T56
Axle/Gears: 3.08, 3.42
Re: 300+hp 305 Has it been done?
in the end if i was going to build up a 305, i'd do it in a way that i could either use parts for a bigger engine and/or sell them. that being said i'd do the build that i mentioned earlier and slap a supercharger on it
#43
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Car: 1985 El Camino SS, 2004 Trailblazer
Engine: Hybrid 305, 91 SD TPI, lots of mods
Transmission: 200-4R
Axle/Gears: 3.42
Re: 300+hp 305 Has it been done?
Yes, It can be done! And there ARE good, affordable VORTEC chamber heads with old style intake flanges that can you can bolt a TPI base directly to. EQ makes these heads in 305 Chamber sizes. The problem is that the TPI base will not always cover the intake ports without welding and porting the manifold base. How do I know, you ask? I BUILT ONE! Is it Easy? NO! IS it Cheap? NO! Is It worth it? Yes, If you want to do something that no one else is doing! I can give more details if you like.
#45
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Location: Houston
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Car: 86 Iroc Z
Engine: Built 305
Transmission: 700R4
Axle/Gears: 3.73
Re: 300+hp 305 Has it been done?
I have a built 305 in my car. I would'nt doubt that I am close to the 300whp range. Don't know yet havn't had it dyno'd. forged rods,pistons, 10:5:1 comp, Ported stock 305 heads.2.02/1.60 valves. Doesn't run too bad. Need a better intake and exhaust system though. Tuned running a tpi setup.
#46
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Car: '86 Z28, '91 RS
Engine: 305ci, 305ci
Transmission: TH200c (no kidding), TH700r4
Axle/Gears: 2.73, 2.73
Re: 300+hp 305 Has it been done?
I don't know I have never heard a single good thing about those heads from someone who used them. Even the flow testing looks bad with them. Maybe someone with good results can correct me but I've never read a good review.
#47
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Car: 1987 Iroc Z28/ 1982 Z28
Engine: 355 TPI IP/ 305 CFI
Transmission: T-56/ 300C
Axle/Gears: 3.42 Open/ 3.73 Posi
Re: 300+hp 305 Has it been done?
I have a 305 TPI in my car, and it keeps up with the my girlfriend's 70 LT1 in her 84.
88 roller block
87 MAF TPI
9.5:1 comp
L03 heads
94 LT1 Cam
95 LT1 24# injectors
Ported plenum
descreend MAF and modded air box
9* BTDC timing advance
1 5/8" headers into 3 inch system
T-5 5speed
3.42 rear gear
It runs like a raped ape on a factory tune, new heads, full port and polish, and tune coming this winter
88 roller block
87 MAF TPI
9.5:1 comp
L03 heads
94 LT1 Cam
95 LT1 24# injectors
Ported plenum
descreend MAF and modded air box
9* BTDC timing advance
1 5/8" headers into 3 inch system
T-5 5speed
3.42 rear gear
It runs like a raped ape on a factory tune, new heads, full port and polish, and tune coming this winter
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