Head and piston combination Help

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Jul 19, 2009 | 11:39 PM

kikass_z28

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From: Lino Lakes, MN

Head and piston combination Help

Im in the process of planning a build and was curious what would work better. I would like to run a 9:1 comp ratio but would it be better to run a larger chamber head and less dish on the piston or smaller chamber and more dish? Would either way affect drivability or power?

Jul 20, 2009 | 12:06 AM

TurboAv

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From: Tonopah, AZ

I've heard that larger chamber is better, but that being said I'm using my stock 243's with -16cc dished pistons.

Jul 21, 2009 | 05:23 AM

kikass_z28

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From: Lino Lakes, MN

anybody else?

Jul 21, 2009 | 09:27 AM

elias_799

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From: toronto ontario canada

use bigger combustion chamber heads. your motor will be less prone to knocking then with 241 heads and bigger cc pistons.

317 lq4/lq9 heads will work great.

Jul 21, 2009 | 12:21 PM

79mike

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when you start using smaller pistons you start losing meat for the piston rings too.. lol I can't remember how somebody else put it but its much better to run a larger combustion chamber head than smaller piston

Jul 21, 2009 | 12:41 PM

ChevyChad

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^^ right. You will have more meaty ringlands with a smaller dish. +1 for bigger cc heads

Jul 21, 2009 | 02:40 PM

pwrtrip75

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Larger chambers = less valve shrouding = better flow.

Just visually looking at the LS1 flat top piston vs the 5.3 dished, the dished has more meat around the outside edge, a place I see a lot of pics on here of the flat tops breaking the edge off. Also a smaller flat area will have more structural integrity than a large flat area, so theoretically given the same material thickness a smaller diameter piston would be stronger. But aftermarket stuff it would all depend on the manufacturer... to each their own and all are different probably.