ZZ4 compression ratio...
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Supreme Member
Joined: Aug 2001
Posts: 2,136
Likes: 2
From: Costal Alabama
Car: 1989 Iroc-Z
Engine: 350, ZZ4 equivalent
Transmission: Pro-Built Road Race 700R4
Axle/Gears: 3.23 Dana 44
ZZ4 compression ratio...
The ZZ4 is rated at 10:1 compression ratio, I can’t figure out how they got that. The pistons are 6cc valve relief’s, the head gasket is .051, and the heads are 58cc. According to this calculator: http://216.121.161.76/files/EngineCalculator.xls that should make the compression ratio of the ZZ4 9.73:1. Can anyone shed some light on this?
The reason I would like to know I bought a GM goodwrench caprice engine which comes with ZZ4 pistons and I am putting ZZ4 / corvette heads on and I am trying to figure out what my compression ratio will be.
The reason I would like to know I bought a GM goodwrench caprice engine which comes with ZZ4 pistons and I am putting ZZ4 / corvette heads on and I am trying to figure out what my compression ratio will be.
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Are you sure about the gasket compressed height? (I have no clue, personally).
Going to .040" compressed height makes 10.0:1.
Going to .040" compressed height makes 10.0:1.
Thread Starter
Supreme Member
Joined: Aug 2001
Posts: 2,136
Likes: 2
From: Costal Alabama
Car: 1989 Iroc-Z
Engine: 350, ZZ4 equivalent
Transmission: Pro-Built Road Race 700R4
Axle/Gears: 3.23 Dana 44
Originally posted by five7kid
Are you sure about the gasket compressed height? (I have no clue, personally).
Are you sure about the gasket compressed height? (I have no clue, personally).
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WhteRbt
Tech / General Engine
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Sep 21, 2015 09:48 AM
101, 1988, calculator, cam, chevy, comp, compresion, compression, engine, increased, iroc, ratio, stock, zz4, zz430
