garth285

Hey guys, wondering what size combustion chambers the lt1 heads have stock, thinking about doing a rebuild and looking for the right piston/compression set up.

probably gunna go for 10:1 to keep the nitrous happy.

SILVERZZ28

iTrader: (3)

58cc 58.5cc

96capricemgr

iTrader: (1)

Why would you drop compression for nitrous . IMO get the compression UP some how much depends on the cam and get quench set well to help avoid detonation. The stock 10.4 should be consider bare minimum for anything but boost.

Camaroholic

iTrader: (1)

Agreed. My '98Z runs at about 12:1, and just looooves the juice.

On race gas, of course. If you're going to run pump gas, I'd still shoot for 11:1, and splash it with race gas at the track.

garth285

cool, will do, 11:1 is still very safe with pumpo gas....Thanx guys

96capricemgr

iTrader: (1)

Keep it fueled and appropriate spark retard and you will be fine.

matt94z

iTrader: (49)

I thought the LT1 heads were 54cc.. not 58cc

z_speedfreak

iTrader: (3)

as did I ^^^

monster7

iTrader: (1)

lt4 is 54 and lt1 is 58

lt1taracing

lt4's are 58,lt1's are 54. and yes i have measured them.

SS MPSTR

iTrader: (1)

Confirmed.

monster7

iTrader: (1)

i had a set of lt1 heads they were milled .030 and measured right under 55cc with no kind of porting on the chambers at all
have a set of lt4 heads that have alot of porting and not been milled at all and measure 56cc
explain that

lt1taracing

my stock lt1 heads measured 54cc and had never had anything done to them at the time.

lt1taracing

i know castings can vary and some can more or less than others. ive also checked another stock set and they were slightly over 54. 54.3 i believe.

roughneck427

iTrader: (12)

mine were 54cc's and i thought the LT4's were the same only way the bumped the compression up is by the valve reliefs in the pistons according to this site http://www.grandsportregistry.com/lt1vslt4.htm

whynot

my heads were just under 54cc's, stock 93 alluminum.