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Compression Ratios

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Old 05-17-2000, 06:55 PM
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Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Compression Ratios
The 90-92 L98 cars have a compression ratio of 9.6:1, not 9.3:1 like is shown.

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1991 Camaro Z28
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13.32 @ 105.27 MPH
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Old 07-11-2000, 03:00 PM
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My 1992 GM Service Manual says the compression ratio for the L98 is 9.75 to 1
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Old 07-22-2000, 03:00 PM
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Car: was: 1984 Camaro Z28
Engine: was: L69
Transmission: was: 700-R4
LG4 ('76 - '87?) = 8.6:1

L69 ('83 - '86) = 9.5:1



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Old 07-24-2000, 09:50 AM
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I believe, but don't quote me on this, that in '85 the LG4 got a compression increase to go with the addition of the knock detection stuff.
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