alright guys, i am holding off on project 4" bore for now, cause i really like driving my car everyday. i am solidifying the drivetrain with a new tranny and converter next month. ATI converter and a 700r4 that will handle 400+hp. hope to get a 9" or 12 bolt by the end of the year too. once that is done, i am going to play a little more with the 305, just to see how close i can get to that 12 second barrier. i have already gone 13.75@100 w/ 3.73's and 28" tall tires. i now have 4.10's and am 125 lbs. lighter, should be close to 13.5. here is what i want to do:

do a cam/head swap.

current setup:
crane blue racer cam 214*/224* duration @.050 w/ .442i/.465e
BONE STOCK 416 heads with fresh STOCK valves.

here is what i want to do:

COMP xe268 cam with complete kit (cam/lifters/springs/retainers/timing chain/etc.)
either 416's with 1.94/1.50 valves with some home porting/bowl blending OR a set of 113 corvette aluminum heads with fresh valves.

questions:
which head is more economical?
with the aluminum heads, how much would my 9.5:1 c/r drop? (they have the same combustion chamber size: 58cc)
is the cam i have selected too big for the 305 regardless of head selection?

link to specs in sig at cardomain site.
thanks for your help!

 

Your not going to gain any power with those heads, they do not flow more then 416 heads, and you will lose all your thermal effeciency. I'd just port the 416 heads up, and play with those. That cam isn't too big if the rest of the the drivetrain is built to support it.

 

think those high 12's are close with the cam/head upgrade? car weighs around 3050lbs.

 

The 416 heads may need better springs with that cam.

 

yeah, i know, i am buying the complete cam kit that comes with matched springs.

 

How high of a converter are you going with? Personally, I'd like to see a bit bigger cam in there. Something about 230 intake and 235+ exhaust duration-wise and somewhere about 2800-3000 stall. Especially since you're carbed.

I've got a single profile .465/.465 234/234 duration cam in my otherwise stock TPI and I got nearly 60 HP over stock with no cat as my only other mod (no headers!!!) O.K., I take that back... I got a home built CAI too, but that mainly just helps with heatsoak problems...

 

converter was built for my current cam by ATI and i am not sure what it stalls at yet as it's not installed. but it should work just fine with the new cam as well. i am planning to play with this motor a little more as is, but i want to go ahead and start gathering parts. hope to do this by the end of the year, even better would be early Sept. as i have a big grudge match in Oct. against a 74 cuda with a 360 in it.

 

Well if you like driving it every day that kinda kills the week or so it would take to get the heads done up. Ive used the 416's & 601's 305 Iron heads worked over and they were fine. I'd suggest you run to the bone yard and pick up a set of 416's or 601's and work them over so when the time comes it will be a weekend project. I like the (truck) 601's better they have a slight advantage in stock form, the runners are cleaner but this doesent mean squat once you port them. I dident read what type of compression you have now since you have bored your engine, the comp XE 268 doesent like over 10:1 so that may be somthing you want to call comp about before you put $$$ down.

 

i already have a sorce for some 416's, it's just a matter of going and getting them. if i stick with the 416's, i can keep my very streetable 87 octane loving 9.5:1 c/r.

 

If you're going to work over a set of 416's, then you're REALLY small on the cam. Worked 416's can flow upto .500 lift pretty easy before they stall out...

 

I'm sure you're aware of it, but '416 heads can be a little tricky with 1.94 intakes. You have to open the chamber perimerter quite a bit to maintain edge flow, and that's going to drop CR just a bit.

As long as you're starting with a spare pair of heads, the time is great to fit up studs, plates, and good springs to handle the lifts you'll want.

I'm thinking that bnoon is right. With the higher stall RPM and the gearing you're looking toward, the even smallish displacement will live with more cam. You're not running a PowerGlide, after all.

 

true, i am sticking with the 700r4. i am just really into low end torque. with those worked heads, what would you suggest i do for a cam? i am afraid to get too wild, cause i like the streetability of the car as is. i drive it EVERYDAY that i can. i have another vehicle when my parents are out of town, (75% of the year), but i still love to drive my camaro. i would also like to stick with the 600 cfm vs(don't worry, it's a NICE 4150 series carb) i have for ATLEAST a little while. haha.

 

so anyone wanna suggest an off the shelf cam? i'd like to stay with COMP but am open to others (heck, my current cam is a crane and works fine)

 

It's time to go nuts. Solid XE274.

 

STREETABLE comes to mind

 

thats perfectly streetable,

Sounds like you need to man up about it

 

I'm in about the same situation as you mw66nova. But I'm putting my LG4 heads on a 350, and using the Comp XE268h K-Kit that Comp offers (when I get the money that is... the rotating assembly is killing my wallet lol).

I love the low-end torque that my car offered in stock form, and want to stay there, and just build from it... the beautiful thing about the xe268h is that it's as high as you can go w/ a stock converter...

but since you dont have a stock converter, you should go a bit lumpier. I dont expect my ported out 416's and K-Kit w/ 350 cubes and 9.5cr to be putting me anywhere near 12's even with gears. I'll be using the stock intake (worked a little bit too), and trick out my q-jet to 750cfm though.

You have a much better set-up than I do, and are planning to go about the same route as me... I think you're better off going a little more wild and up the cam a bit... your head choice is fine. Your MPG and idle quality wont be too stricken by a bigger cam, as long as you pick a good one.

 

i would like to keep it hydraulic, i admit. solid cams just kinda scare me cause i don't want to have to set valve lash all the time. if it saw less street driving, then i would be cool with it, but i drive this thing everday.

 

I used to drive a solid lifter cam every day for 2 years. Minimum of 1500 miles per month. I adjusted the lifters when I changed the oil, but probably didn't need to do it that often (many times didn't touch an adjustment nut). That was before the days of synthetic oil. Sold the car for reasons other than having to adjust lifters - wish I would have kept at least the engine.

Buck up, dude! Time to get serious!

 

There are other things to consider about the 113 heads,such as saving 25 lbs. of weight per head, angle plugs, hi flow D shaped ex ports,and raised rocker cover rails to eliminate leaks.With some porting these heads with the above added in should outperform th 416 heads hands down,mine do............

 

i don't want to go too crazy on the cam cause i just bought that nice new ATI converter. i can have it re-stalled by having them fiddle with the stators, but would rather not spend all that time getting stuff into the car, only to drop the tranny to pull the converter a week later cause it's too tight. with p/p work on the heads (if i find a set of 113 heads that aren't outragously priced, i will consider them) and a better cam, is that 12 second mark close? i guess i really need to get the new tranny and converter in the car and get some sticky tires on it and get some real passes made, huh? just got shoulder surgery so it's gonna be a little while before i am back underneath the car, unfortunately.

 

Remember that the 113's are 58cc for a 350 engine. The static CR is raised with aluminum heads in order to offset the heat loss through the aluminum vs. iron. Even though the static CR would remain at 9.5:1 (assuming it's 9.5:1 with 416's), the effective CR would be lowered. Therefore, you should shave them for the best results on a 305. However, if you plan on putting them on a 350 later, leave them alone and live with the loss on the 305.

You are going to have to choose between 12's with the 305 and the street if you aren't willing to use a power adder.

Why would your converter be incompatible with the XE274? What's your real goal, 12's, or using what you've got? Restalls are like tuning - a little more involved since you have to drop the tranny, but it's still tuning. Solid lifters are also "tuneable", unlike hydraulic lifters. Millions of street cars have run solid lifters - it's just that Chevrolet made SBCs hydraulic from the get-go.

 

after doing some research, i think that if i do some porting on my 416's and keep the stock size intake valve at 1.84 and go up do a 1.5 exhaust valve, it would actually flow more, and i wouldn't have to deal with shrouding. trick is, finding some higher flowing 1.84 valves.

five7kid, thank you so much for all the input on this, but i think that for right now, i will go a bit milder on the cam (xe268/274 range) and stay with my converter. this is getting a bit outta hand. i want a solid car that can run relatively fast. a low 13 second car (which i think it will be) that is reliable will be just cool enough for me for now. i still gotta get this thing painted yet! it's taken me a while to get the car to where it is right now and i don't make a ton of money so, the crazy 305 build will have to wait till probably sometime next year. i really need to get another car. a little four banger/5speed s-series pickup or something of that nature before i tear into this motor. i still want to be able to drive the car too and from the track, which is why i am beefing up the drivetrain w/ the heavy duty 700r4 and the 9" to be installed before next winter.

 

Check out the lift and RPM range of the Comp XS262 solid vs. XE268 hydraulic cams. Tell me why that isn't the perfect answer to power and streetablilty.

There is nothing "unreliable" about a solid cam.

 

trick flow p/n 3030005

175cc intake runners
58cc combustion chambers
1.94/1.50 valve combo
aluminum (duh, they're trickflows)

price: $1005.99 for the pair from summit
supposed to be released in March/April time frame.

what do you think? i don't have flow numbers yet, hope to by the end of the day tomorrow, gotta call TrickFlow.