Chevy99

Can I increase the CR with changing the gasket only?

jrp

iTrader: (16)

yes..

obZidian

iTrader: (2)

ok, that given, can i lower the CR with a gasket swap and by how much?

Im at 11.1-.3 and would like to lower if possible in the future for a FI kit

Chevy99

That's good,, which gasket can I use with the stock heads: .030'', .040'' or!! and what CR will I get?

TheMNkid

... And if he did so how much HP will he gain? Does it help?

black_knight

iTrader: (1)

Yes... but?

(Or was that a typo?)

jrp

iTrader: (16)

yes you can lower with a thicker gasket but you'll end up with a less then ideal quench, especially with the thickness of the gasket you'll need to lower 11.1-11.3 to a boost friendly level

just throw on som 6.0 heads to lower the CR.

jrp

iTrader: (16)

.040 will give you a ~.032-.035 quech and 10.7 - 10.8. assuming stock deck height and 66cc chambers

jrp

iTrader: (16)

no typo, just trying to get the 5 charactor limit..

jrp

iTrader: (16)

a full point of CR 10.1 to 11.1 is generally worth a 4% increase across the board. gains are more beneficial with a larger duration cam.

jrp

iTrader: (16)

the thread starter will gain hp though . the other guy will loose power, yes.

2MuchRiceMakesMeSick

Yeah. I read it wrong. I thought he wanted to lower his compression

Chevy99

OK, I will get .040'' gasket, but do I need to tune the PCM for that?

jrp

iTrader: (16)

you could add a bit more timing if you wanted to provided you get no detonation.

Chevy99

Thanks bro......