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