alright so I'm going to be putting around 3g's into my 75 here shortly and want to make some more power. my combo right now is a 350 gm 260hp crate motor with an performer egr intake"egr blocked off" and a pro-form 650 carb. I'm waiting on my headers to arrive and they should be here by Friday. the car is going to be a street warrior I'm not caring about gas millage and its only going to be driven on clear days and at the track every now and then. i know this is a long post but I'm really board and am looking for some good advice. thanks Jeremy

Heads, compression and cam.

The GM crate has 76cc heads and lower compression, along with a tiny cam..

I would look into the vortec head kit from SD parts. IIRC around $1,000-1150 for vortec heads modded for higher lift, edelbrock RPM vortec intake, head gaskets, head bolts, etc etc.

Not only does the vortecs run circles around your stock heads in the flow numbers but they are also 64cc which will bring your compression up.

Then with that, myself I would run a crane powermax 272/284* cam kit ($150)

Recurve your dist ($6.50) to bring in the full mech. advance between 3,000 and 3200 rpm.

Put headers, dual 2.25" to 2.5" pipes and dual high flow mufflers like dynomax super turbos, ultra flos, or summit turbos.

ive ordered my headers and they shoould be here by friday. as for the compression should i go ahead and throw in a set of piston while i have it turn down that far?

Just get your CR. up to about 10 to 1 and you will run great with that cam and combination, imho...

pdq67

OK but how would i get my compression up. i kinda new to actually building a motor.

for approx 1200 bucks you could bolt on trick flows 23 degree head and spank a vortec with your eyes shut.
we've done many 4 bolt crate-based shortblocks and added good heads and cam.
one of my emplyees has a basic longblock, still stock junk heads and 8:1, witha particular cam, and he's running 102 mph with no traction in a monte carlo ss with a zf 6 speed and no posi.
so if 102 is quick enough for you in a 3600 lb car, you can get off way cheap.
it wont be, so preparre to spend bucks.
nobody should ever recommend a cam to someone without knowing trans and stall if auto, rear gear, tire height, intended use, desired idle quality, etc.
so provide that info, after deciding about heads and therefore compression ratiom abd check back in.

monte carlo ss with a zf 6 speed and no posi.
so if 102 is quick enough for you in a 3600 lb car.

nobody should ever recommend a cam to someone without knowing trans and stall if auto, rear gear, tire height, intended use, desired idle quality, etc.
so provide that info, after deciding about heads and therefore compression ratiom abd check back in.

I do NOT agree with your comment on how to pick a cam out.. Yes your gears and converter needs to match cam, but unless the cam matches the compression and heads on engine it will not make good power.

The cam has to be sized IMO to the cid of engine, compression ratio (mostly) of engine, heads and intake used and the useage of engine once its put into a car.

Then match your gears and stall to the engine. Heck you can do ok with a mild mis match of gears and stall but you can't do that with cam/compression.. Over cam it and its a dog, under cam it and you get detonation and run out of breath.


Now 75camaro.... Heres all the ways to get compression up
1) smaller chamber cc's on the heads
2) thinner head gaskets
3) deck the block
4) pistons with lower cc's (like flat tops vs. dished pistons)

That crate was built with the these specs..

head gaskets used .026" to .028" thick x 4.100" bore

- 8.3435 cc pistons

Cylinder Heads- part # 14034808, casting #33417369, 1.94" Intake valve, 1.50" Exhaust Valve, 76cc Combustion Chamber, 7 Bolt style Exhaust Flange Standard, 85' and prior intake manifold bolt pattern. Perimeter bolt style Valve Covers. This head is very similar to the old #882 castings

Hydralic Flat tappet Camshaft- #14088839
Intake Lift-.383" Exhaust Lift-.401"
Intake Duration @ .050"- 194
Exhaust Duration @.050"- 202
Lobe Seperation-112


If you was to use a fel pro 1094 or 7733sh1 .015" x 4.100" head gasket with your 76 cc heads it would bring compression up from 8.5:1 to 8.73:1.. If you was to use those gaskets and a 64 cc head your compression would be 9.88:1

With most street performance engines you want 9.5:1 to 10.5:1. So 9.88:1 would be real good IMO

alright cool its 2:17 here and i cant sleep so i figured i can answer some questions. The trans is a th350 with a stock stall but am planning on a 2400 stall. as for the rear the plan is a 3:73 or 4:10 posi. the rear tires will be 315/35-17. the car want be a daily driver or anything but would like to be able to make a cruise ever now and then without having to worry if its going to brake something. if there is anything else please post it up. i want to this the right way first for a change and get the car back on the road.

Well i got my headers on this afternoon but in the process broke my starter. anyway going to get my exhaust done probably on Friday if i can get the car legal tomorrow. I'm planning on 2.5 with an "H" pipe dumped under the doors but i cant decided on which muffler. any ideas? thanks for the info so far its being useful.

well now Ive got a real question for everyone...i put a new starter on and it does nothing. what i mean is it will turn like 4 teeth on the fly wheel and stop. i cant figure this out. any ideas? I'm going to pull the headers of tomorrow and see if something may have fallen in but i doubt it. please if anyone has a suggestion post it up. thanks Jeremy

Did you get the right starter for your flexplate. The teeth on the plate has to match up with the starter

GM used a 153 tooth and 168 tooth flexplate/flywheel.

The starter for the 153 tooth will have a nose cone on it with the 2 bolts stright inaline..

The starter for the 168 tooth will have a nose cone with the 2 mounting bolts offset from each other.

Also hows your battery cable ends. It theres a loose connitions then it could cause that.. Along with battery voltage. If the voltage is too low it could do that...


To your other question on mufflers.. Myself I would say dynomax ultra flows, super turbos or summit $14.75 turbo mufflers which are dynomax super turbo blems

ithe starter i had on the car had the offset bolts so thats what i got. im going to get some new cables and shims to day and see if i can get it all to work. Ill post up here in a few hours when i get back from the shop.