Standard Factory Compression Ratios
4age
16v Bigport - 9.4:1
16v Small Port - 10.3:1
20v Silvertop - 10.5:1
20v Blacktop - 11:1
Gze
Supercharged GZE Bigport - 8:1
Supercharged GZE Smallport - 8.9:1
7a
7afe - 9.5:1
Standard Factory Compression Ratios
4age
16v Bigport - 9.4:1
16v Small Port - 10.3:1
20v Silvertop - 10.5:1
20v Blacktop - 11:1
Gze
Supercharged GZE Bigport - 8:1
Supercharged GZE Smallport - 8.9:1
7a
7afe - 9.5:1
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