klumb15

iTrader: (1)

I'm going to build up my 350, to approximately 450 horses...ported aluminem vette heads, all redone and everything, then new cam, rpm airgap intake, and a carb to achieve 450 horses...i'm also gonna do suspension mods like torque arm, lower control arms, reloacation brackets(because its lowered), and panhard rod, i'm also gonna get 265 tires to help me grip up a bit more...i'm running a 700r4 with a shiftkit, and I might beef it up a bit more..i dunno we'll see...If I can get the car to hook up pretty decent, potentially how fast will I be able to run in the quarter??? do you think I can achieve high 11's or low 12's??? i'm also running a auburn posi unit with 3.73 gears....

ShiftyCapone

iTrader: (7)

You would need about 450 at the wheels to run high 11's. What is your target vehicle weight? A lot depends on that. 450hp can get some cars into the 11's but they weigh next to nothing. You are going to need a stout cam to achieve your power goals. I would say that with the right traction/stall and gears you should be in the somewhere in the 12's. I realize that is a huge gap but there are a trillion factors and set-up options where 450ph could put you anywhere in that range.

ljnowell

Now that this is in the right forum......

I dont know that you will get 11's or low 12's with the ported L98 heads. There are a lot better heads to be using, I would start with getting some.

klumb15

iTrader: (1)

well i was gonna...i was gonna get upgraded vortec heads...but everybody was like NO NO NO..you got aluminem vette heads, why dont' you just get those redone...so that was my plan...yes i realize i need a pretty big cam, and i'm gonna run about a 3000 stall also...i wanna get my car down to 3,000 lbes with me in it after this winter.....and I should be able to do that...i realize there is a lot of factors, but if high 11's is possible, and low to mid 12's is a reasonable guess...i'm pleased with that.....they say you can get alot of power outta those aluminem L98 heads, I don't know how much truth is to that, but I have a good race engine builder in my area, so i was gonna go talk to him about it...

freestylzz

If you end up doing what I think you're doing, with the right set up you'll be hittin' 12.3''s. Hit it with a 115 shot and trim another second off that

Ya, ditch the stock L98 heads.

/\/3\/\/l8l3

I bet if you take it to the track right now you'll pull a 13, and have 325 rwhp. Those heads suck change to 2.02/1.96 alum and get it over with.

Orr89RocZ

iTrader: (20)

stock vette heads can flow enough to get 11's. needs a great port polish job but its possible. some aftermarket companies offer services to port the heads and i seen them flow real good. but by the time u put in that money in all that work, you can buy a set of good heads like pro 1's or track 1's or afr's.

450hp should get high 11's if you hook good. just like 355 superram afr 195 lpe 219/219 combo. makes over 400crank hp but runs low low 12's.

vejatabul

thats funny, i made 275hp to the wheels and ran 12.45. my car weighed 3250.
450 to the wheels is enough to get you in the 10's!

Orr89RocZ

iTrader: (20)

what setup was that? what gears and was that on slicks? sounds pretty good. i would say with a 3500lb car tho, thats like high 12.6's or so.

vejatabul

stock 20,000 mile short block out of a chevy truck,
stock vortec heads with manley ss stock size valves w/ 30 degree backcut,
comp 284xe cam ,
gm intake,
flowtech 1 1/2 shorties no cat and 4in mufflex,
holley 650 dp, 1inch spacer,
no ps no a/c ,
stock th 350 with 3200rpm stall,
9 bolt w/ 3.27's,
lakewood control arms , bmr con arm relocation brakets,
sportline springs, kyb struts and shocks, 24mm rear sway bar, 36mm front sway bar,
16x8 gta wheels with bfg drag radials ,
msd 6al, dui hei dist, timing locked out at 32 degrees............and best of alll,
i did it on 87 octane crap gas.
it ran a 1.69 60'.

/\/3\/\/l8l3

We are talking about 1/4 not 1/8th

Orr89RocZ

iTrader: (20)

stock 20,000 mile short block out of a chevy truck,
stock vortec heads with manley ss stock size valves w/ 30 degree backcut,
comp 284xe cam ,
gm intake,
flowtech 1 1/2 shorties no cat and 4in mufflex,
holley 650 dp, 1inch spacer,



thats a big cam with the vortec's. and some small headers. LOL i guess its possible to run very quick times with low horsepower as long as you make a hell of a good launch. LOL 1.69 aint to shabby..

what did it trap? i bet it didnt trap more than 105mph

klumb15

iTrader: (1)

so should I go with new heads or should i get mine redone...i have a really good machine shop that does ALOT of engine work, and they do awesome work, and can extract alot of horses outta the heads, and they are pretty cheap as well.....Is it worth buying a whole new set of heads???

DON 88T/A

I have seen ported vette heads achieve 250+cfm on intake...not far from AFR 190 out of the box...enought to support 450+crank hp..You can't put an e.t. on horsepower alone...otherwise there would be alot of Supra's running 7's out there...
....Like said above,there are cars running 12's making 300 or less at the wheels...its the weight of the car how well its setup for traction ect...Assuming you spec your motor correctly and do the appropriate suspension mods, an L98 Aluminum headed 350 can get 11's...

I had a set of Aluminum L98 awhile back...it had a nice hand port job on the intake/exhaust(though the chambers were still stock)..and stock valves,1.94/1.50..and it managed 230ishcfm on the intake side..exhaust was around 180cfm I think...The combustion cambers could have been ported along with bigger valves(2.00/1.56)..they would have flowed a bit more..if you can get these heads ported for a decent price I say stick with them...if your going to big cubes/power adder down the road...then an aftermarket aluminum head with a thicker deck is better...

vejatabul

doh! is right. i built the motor for $985. how much did your motor cost? and how fast is it?did you build it yourself? in the 1/8 mile my car went 7.99 at 85.2. i built my motor with absolutly no info from anyone, i simply did what i could with what i had. not everyone is some newbie punk kid, some of us have jobs and houses and work for our money.

pasky

Not necessarily. There is a stock 92 thirdgen with no seats except the driver. No heater box. Runs slicks, 4L60E, stock LS1 and he runs 11.7. I know for a fact he isn't at 450 rwhp. I know because I was there when he dynoed, he hit 329 rwhp. All about traction. He has relocation brackets, he made custom subframes too.

Orr89RocZ

iTrader: (20)

yeah and 12.45 in the 1/8 is absolutely ridiculous. thats falling asleep slow LMAO

vejatabul

good lord! what the hell are you talking about? you guys are retarded.....12.45 1/4 and 7.99 1/8. freaks...........

nidyanazo

"..i wanna get my car down to 3,000 lbes with me in it after this winter..."

Dude you are gonna have to shave alot of fat off that car, like no interior style and well check this thread for some great weight saving tips:
https://www.thirdgen.org/techbb2/sho...hreadid=263989

What do you weigh? 150-200lbs? Lots of removing shiz gonna be going on!

Orr89RocZ

iTrader: (20)

i know its in the 1/4. just stating that if it was that would be crap slow! LOL i havent seen a car that slow. LOL

/\/3\/\/l8l3

I know he was talking about 1/4 mile, I was kidding take a joke.

I have a job and a house, and a garage, but no tools since some jack *** stole them.

Anyhow stock camaro running 11.7 with slicks is total outright bs, unless he lightened the car upto 1900 lbs w/ driver that is impossible.

Good day

ljnowell

Dont you read before you flame? He said it was stripped. No seats except driver, no heater box, etc. SLICKS, and an LS1. 329 RWHP. It can happen.

pasky

You really are ignorant you know. Read the post again, it ain't stock.

klumb15

iTrader: (1)

well i got a fiberglass hood, takin out rearseats, a/c delete, hopefully light rims, muffler and cat delete, and a few other minor things....probably some of that other stuff off the list.....its at 3500 with me in it right now, so I'm gonna try to get it down to 3,000, but if I'm not successful, i'm over it....I think I am gonna stick with my L98 aluminum heads, and see what kind of power i can pull outta those....i realize the main thing is getting the power to the ground....thats why i'm getting performance suspension parts like, lower control arms, relocation brackets, all new bushing, torque arm, subframe connectors, panhard bar, also i'm getting 3.73 geras with a 3000 stall, and wider tires, 255 or 265.....so I think i'll be arright....i don't wanna throw too too much money into this thing, but i'm keepin this car forever, so maybe sometime after college I'll rip the 350 out and put a big block in or something..who knows...

pasky

A tubular kmember will also get you closer to your goal on losing weight.

klumb15

iTrader: (1)

alright...thankyou...those cost a pretty penny don't they??? also, a bit off subject, but do racing seats make a dramastic wieght loss or no??

ShiftyCapone

iTrader: (7)

No. But they do offer more saftey with shoulder harness provisions and side bolsters to keep you planted.

ross

Race wt 3500 lbs with 320hp at the tire ran 12.10s same car 425hp at the tires 11.29 The heads will work I would use the 2.00 and 1.56 valves and a good port work but it may be worth the cost. Can always sell this heads and get the vortecs Im a big vortec fan use factory valves and valve job clean up only the sharp edges and cut the valve guides down and add the springs for your new cam. Helped my friends kid out he didnt have much money he bought a discount auto 350 factory roller cam motor it took two trys first motor was a flat tappet cam didnt want that. Any way with the roller motor I had him order the vortec head packages with the performer intake 1.6 proform roller rockers and a 750 vac secondary carb someone gave him and a 2400 stall converter and 3.73 gear car ran 13.00s to 12.90s depending on weather with the stock cam. The vortecs flow as well or even better than the older dart 200cc heads. 230 or 240 cfm at .500 lift

jocww

i say throw some 456 or 488s and be done with it screw the lightening up of the car if its a drag car or the track isnt far away steep gears sticky tires and a good tranny =s fast times

klumb15

iTrader: (1)

how much can I get stock vortec heads for??? and where can I get them for a decent price...what all has to be done to those? just cut the valve guides and what do you mean by cleaning them up a bit??? is there an online place that has them for cheap??? help me out, i'm getting suched mixed replys here...

crazy3rdgen

iTrader: (1)

HAhaha ohhh **** bringing up the vortec heads.. i just got a 350 vortec 5.7 l.. gunna be a 355 vortec- 450 at the wheels.. here i'll post a pic of them just to give a little tease sry :lala:

Orr89RocZ

iTrader: (20)

i hope your running boost or nitrous cuz i dont see 450rwhp on a 355 with vortec heads

ljnowell

Yeah, I think you have your work cut out for you if you are gonna get 450 at the wheels with vortecs. They are going to need A LOT OF WORK to get anywhere near that point.

klumb15

iTrader: (1)

so much for that tease hey

gary sanders

from what ive read vortec heads is the way to go,as far as bang for the buck,lots of these heads are avalable,and all the racers in my area are switching to these heads on street/strip cars.i run dart sportsman heads,205 valves,and 220cc runners,lots of pull all the way to 7000 rpm,even when the cam runs out,probly not making any power after 6500,but it sure fells strong,lol

ljnowell

Vortecs provide decent performance, but they certainly dont out perform aftermarket heads. By the time you pay to have everything setup for performance, you may as well have just bought some aftermarkets.

Vortecs = not all they are cracked up to be.

gary sanders

1 more thing,450 horse is possible,but you will have to do all the little things to get there,what i mean is 450 at the flywheel,my 355 makes 435 at the crank,and some where at 365 to 385 at the wheels,so youl have to do alot of work,heads,balance the bottem end ,so on,but good luck i was a little short,but im still pleased with my little 355!!!!

Orr89RocZ

iTrader: (20)

yeah vortecs are only good to 450inch lift. gonna need to machine it to put in some good springs for.550 or so. even then, they max flow at .500 so more lift isnt necessarily gonna yeild much unless you port it out. your gonna need a hell of a port job and lots of duration on the cam. cranking fairly high rpms and that aint gonna like the street much. i know of some 500crank hp 355ci race cars that arent close to being streetable. just some food for thought. i seen miniram, ported out AFR 195's, big solid rollers on 383's makeing 420-460rwhp so i seriously doubt vortecs will support that on a 355

vejatabul

my vortec's flowed 242cfm @ .500 on the intake and 159cfm @ .600 on the exhaust. no bowl blending, no cleaning them up, just a 30* backcut on the valve and manley 1.94 valves. 242cfm is enough to theoreticly support 530hp, assuming evrything is optimal. i know however that "optimal" is nearly impossible, and 490hp is probly a better goal.

klumb15

iTrader: (1)

well i would like 450 at the crank, but i'd be satisfied with 400 to the crank.....what if I ran like a wieand 144 supercharger(the small one), would that be much easier to achieve HP??? also what would I have to do to my heads to get the compression down??? also with a little supercharger like that, could i still achieve that HP by porting and reworking my aluminum L98's??

Orr89RocZ

iTrader: (20)

i believe 1bad91z or whatever has been working on a vortec head combo that should go 11's. his are completely worked over and flow alot more than 245cfm. might wanna check him out for some advice on that. he seems to love the vortec heads so it may be possible. i think you may have a chance with the right carb intake or Mini Ram III. some magazine did a mini ram III and vortec fastburn heads and made 450hp. fastburns flow alot more than regular iron vortecs. so vortecs are gonna need a lot of port work. especially on exhaust side. good luck with that.

ross

I know of a set on a car that races in cheap street class unported vortecs with a flat tapet cam and a .060 350 with flat tops on motor the car an 11.10 to 11.00 car weight 3200lbs. As a side note he also said told me that the factory valve job would produce the best flow #.

crazy3rdgen

iTrader: (1)

Orr89RocZ quote:
--------------------------------------------------------------------------------
gunna be a 355 vortec- 450 at the wheels.. here i'll post a pic of them just to give a little tease sry
--------------------------------------------------------------------------------

i hope your running boost or nitrous cuz i dont see 450rwhp on a 355 with vortec heads

why you tryen to be an as$ like that .. yeah im gunna hit 450 whp from a stock 350 vortec bored 30 over..are u kidden me. please say u didnt think i meant it like that..

IM getting

new crank
new cam
New pistons
new intake
carb
lifters,rollers,rods,pushrods
comp springs
30 over

how u think im not gunna hit my mark?.. like seriously.. im still learning and would like to take any knowledge you could give me.. but dont act like i'm some idiot.. i have heard very great results from these stock vortec heads

Orr89RocZ

iTrader: (20)

sorry you took me the wrong way. LOL i wasnt trying to be an ***. trying to help you out.. just mentioning that in my experience on these boards and others, i have yet to see 450rwhp on vortec heads. it be easier to run nitrous or boost. see some of my above posts after that one you just quoted and some of the other guys posts. they will tell you its hard to get vortecs to get that power cuz they simply dont flow enough air. your gonna need to do some work on them to gain the airflow necessary

and on any 355 or so, 450 rwhp NA is alot of power. its hard to get there while trying to be streetable. if its not a street car, then go for it. i simply stating that it while be easier getting a good set of Darts/AFR's/Trickflows for a higher price than what you will go through trying to get 450rwhp with vortecs.

450 crank is more realistic, but to each his own. good luck man.

rx7speed

also guys just looking at the peak numbers isn't the whole story

honestly how much time does the cam really spend at peak lift?

that's another good thing about the afr's if I remember right
not only is the peak numbers good but the numbers leading up to the peak are good as well so your getting quite a good airflow over the whole lift range.

DON 88T/A

L98 aluminum are 58cc...you run a piston that will give you your desired compression for supercharging.
Depending on how much boost you run you could easily reach 450+ crank hp,with ported vette heads.
Like I said earlier,the L98 aluminum have an average deck thickness...which when you get into lots of boost/N20 you have more risk of blowing a head gasket..
But I've heard of guys running decent shots of N20 and the heads holding up...A Supercharger is alot of $$$...its up to you of course...I'v always been a fan of just building a big nasty N/A motor...and adding a little spray if you want more...less headaches in my opinion.

anondude13

A well matched NA 355 w/ carb will reach 450 crankhp. Forget about 450 rwhp. Especially if you don't go flat tappet and you want it streetable. And 30 over doesn't do anything for power. My heads flow about like L31 vortecs, and IMHO there are much better options out there.

Rick King

it is al jst opion on the hp to go in the 11's it just depends on the hole setup. I have run in the low 11's with less hp chassis is a lot of it and gearing + air & fuel deliverly---my advice build the best motor you can afford--then make the care able to put all the power to the ground--I would back half the car and use coil overs and a four link or ladder bbars--then use a power glide with a 1.82 1st gear a 4.10 posi rear (9 inch ford) then use the motor you want and it willl be very tunable for street and strip
this would be great if monwy is no objest

later and

GB

rick

klumb15

iTrader: (1)

well money is an option...i'm gonna try my best to get the power to the ground, but its not gonna be a 9 inch rear or anything....i'm getting a auburn posi unit, 373 gears, more than likely a new tranny to hold the power, and a bunch of rear suspension mods...how do you convert it over to 4 link anyways? is there a kit, is it hard??? what heads do you suggest for the supercharger...the supercharger is only 1300 bucks, and thats not bad at all...how much does it cost to get the pistons replaced by a shop if i take everything apart?

ljnowell

You can get 450 RWHP NA out of a 350 quite easily. Its just not going to be the most pleasant cruising vehicle to drive. I still dont think you are going to get it with vortecs though.