368 sleeves and pistons??

[flyin ryan]

Originally Posted by lbszr

Can pump gas still be ran with the 12:1?

Anybody know what the highest CR and still be on pump gas? Just
curious.

LT-5 specifically or just any engine in general?

[lbszr]

Originally Posted by flyin ryan

LT-5 specifically or just any engine in general?

Was just curious on lt5, found out the hard way 383 with hypereruetic keith black pistons dont hold up up to 10.5cr in a boat on pump gas, it still lasted quite(years, roller cam went in, it lasted 5 hours) a while till it broke the top land off the piston and wasn't room in cyl for it at 6000.

[blackjack]

kb pistons will do that once in a while,if the rings are set too tight
bj

[rkreigh]

Originally Posted by flyin ryan

LT-5 specifically or just any engine in general?

12-1 is pretty high for a "non lt5" engine

the new direct injection and efficient combustion chambers help

as does the variable cam timing

the lt5 of course benefits from an efficient clover leaf combustion chamber and a dished piston at high CR and is pretty detonation resistant even at high CR

[blackjack]

you must also remember that you reach a point of diminishing return,with compression ratios;
you get more hp by going from 8 to 9:1 than you get
going from 11 to 12:1
bj
91/1735
98 c5
2002 z06 w/procharger