88GTAbandit

i was wondering what the stock compression was on an L98??anybody know..if so i would like to know..lol

thanx

dave

91Z-28

9.3:1

91Z-28

http://www.team3rdgen.com/modules.ph...=3rd_Gen_Specs

That same info is also on thirdgen.org but that site is down right now. A great source on engines each year and production totals.

88GTAbandit

yea, im on thirdgen.org, and noticed it was down so i asked on here....thanx for the help guys, im building my motor, and am leavein stock rotating assembly in...thanx again

dave

Kevin91Z

87-89 L98's are 9.3:1, while the 90-92 L98's got different pistons, raising the compression to about 9.75:1.
The LB9's are all the same compression, 9.3:1.

1991l98g92

In the Mitchell, Domestic Car Service and Repair, Engine Performance, Electrical, Engine, Chassis manual for 1991 General Motors Volume 2, it lists the L05 TBI 5.7 (vin code 7) as 9.75:1, 185 HP, 290 LBS torque. The L98 TPI (vin code 8) is listed as 10.25:1, 245 HP, 345 LBS torque.