Editing V6 Chevy 90 degree engines (section)
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==Cylinder Heads== The cylinder heads used on the 200 and 229 had 58cc combustion chambers using perimeter-bolt valve covers. 1985-'95 4.3L cylinder heads came standard with 64cc combustion chambers, swirl port intake ports and centerbolt valve covers. The 1996-present 4.3L engines use the Vortec head, similar in design to the L31 5.7L V8 head.
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