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Old 09-10-2003, 09:33 PM
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piston ?

I've read a post or two about dome piston's being not so good to use,in faver of the flat top piston's because of flame travel.Now im just wondering about the piston's i got from summit,wich are a set of Speed Pro-.030 hyper's with a .120 dome on top to coinside with the 76cc chambered head's that are for a 350 chevy s/b,witch will make atleast 9.3 c/r.I dont see were i'll notice the difference on the street in a daily driver pickup truck.This thing will problebly never see anything over 5,500 rpm's.(please advise)

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Old 09-10-2003, 09:37 PM
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Those new hyper/coated SpeedPros are awesome pistons. Good choice.

Those were the exact same piston I had picked for my new 350. 76cc heads too! LOL The machine shop is going to deck my block so the pistons are dead flush with the top of the block, so I had to go down to the flat top/ 2 valve relief. If you are using the stock block height, you should be fine on pump gas.

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Old 09-10-2003, 09:45 PM
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You might want to recheck the going down flush with the block due tto the fact that the pist does rock in the cylinder,plus depending on your gasket's your quench could get to tight.Now Summit told me that the 9.3 c/r piston's should be atleast .020 deck height.
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Old 09-11-2003, 07:53 AM
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I deck a lot of engines with steel rods to a "0" deck, using at least a .039" thick head gasket. The theory is that with the deck that close you get much more "swirl" in the combustion chamber. It is supposed to cut down on detonation and requires less ignition timming.

Seems to work, and the exra compression with a a flat top is a real plus (some rules require a flat top). The reduced deck clearance is usually so replacement oversize pistons will not increase the static compression ratio over stock ( if the bore gets bigger with the same deck clearance the compression will be higher).

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