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Compression Question

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Old Jul 28, 2005 | 05:42 PM
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KagA152's Avatar
KagA152
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From: Roscoe, IL
Car: 1991 Trans Am
Engine: LQ4
Transmission: T-56
Axle/Gears: 3.70
Compression Question
I was supposed to be getting a set of AFR 210s with 66c chambers, planning to run wiseco pistons (-5.4cc) and a .040 head gasket, yielding 10.8:1 compression. the shop i ordered the heads from fell through, got my money back, and now i found a deal on a set of 210s with 76cc chambers. i figured i would have to change the pistons to the 8cc domes, and run a .060 head gasket to yield a 10.7:1 compression. is there any harm in doing that, or should i just get them milled?
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Old Jul 29, 2005 | 02:16 AM
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ME Leigh's Avatar
ME Leigh
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From: Valley of the Sun
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Is this a 400 or 383? It is generally better to run the smallest combustion chamber as possible. Some of the premier engine builders are using 30-33cc chambers on 400+ cid's so...
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Old Jul 29, 2005 | 03:06 AM
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KagA152
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From: Roscoe, IL
Car: 1991 Trans Am
Engine: LQ4
Transmission: T-56
Axle/Gears: 3.70
383. looks like milling would probably be the way to go then
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Old Jul 29, 2005 | 12:20 PM
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ME Leigh
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Joined: Jan 2002
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From: Valley of the Sun
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
I would never run domes.
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Old Jul 30, 2005 | 03:16 AM
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F-BIRD'88
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From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Just bolt a blower to it, with the 76cc heads and stop worrying.
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Old Jul 30, 2005 | 03:25 AM
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rgarcia63
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From: Houston, Texas
Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
Quench will suffer with a .060" gasket.
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