I have the engine just about apart right now. It is going to the machine shop fist off. I'm looking at about 10:1 comprestion when I'm done using forged pistons, NOS in the future. I'm new to this game and have been researching alot. I was woundering if I was to get 10:1 with 64cc or 76cc. What is the biggest diff I will see? What is the best way to go. The car will be driven on the street and at the strip. I'm just looking for a little clearity on the whole head thing chamber size and runner size, will someone show me the way?

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87 Z28 305 TPI, Auto, LT-1 cam (@.50 418/430, 194/199, LSA 111), roller timing set, 2.73, Gutted air boxes, K & N fillters, Dyno Max 3" cat back, 8.8 mm spirals, air foil, BFG Drag radials,170* Stat and TB bypass.
Old Best 15.414 @ 87.47.
new best 15.006 @ 89.55.
w/ drag radails 14.6 @ 93
“Fallen But Not Forgotten”

 

are going to be using the stock heads or after market?
World Products offer a stock replacment head that has bigger valves and larger runners called S/R TORQER 305.they run a $700 for the pair

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1991 banditt2 #130 of 600
Project 350 TPI Banditt II
http://www.street-dawg-racing.cityslide.com
http://discussion-board.com/GreaterC...dyAssociation/
http://www.cincyspeed.com/

 

you can get 10:1 with the smaller chamber heads using flat top pistons ,you'd need domed pistons with the larger heads. flat tops will give you better flame travel and less sharp edges to heat up and cause detanation problems.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

No I'm building a 350 to replace the 305.

 

For a 350 go with the 64cc heads unless you are turbo/supercharging...

The 76 heads are too big for the 350 and more suited to 383's & 400's set up for pump gas and cast heads, compression is easy to get out of hand on the big motors, and hard to attain on the smaller sb's

Dome pistons should only be used as a last resort to achive your desired compression (after angle milling the heads and zero decking the block) These pistons block the flame propogation and cause a loss on wedge head chambers. Hemi chambers are a different story though...

Is your machine shop going to zero deck the block for you? This is like adding free hp by raising the compression without needing higher octane fuel (because of the better quench) Also use the thinnest composition head gasket you could. If your using FI and aluminum heads and don't mind spending a little more for premium gas (92 or better) you could get away with even a little more squeeze by using flat tops with two valve reliefs instead of the standard 4 "claimer pistons"