V6 Chevy 90 degree engines
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Production 1992 4.3L with RPO L35 had modified cylinder blocks where a balance shaft are used. The balance shaft are gear-driven off the front camshaft gear; camshafts for use with balance shaft motors have a longer dowel pin, which cannot be interchanged with non-balance shaft engines. The current engine block in production since 1995 eliminated the front and rear freeze plugs with extra strengthening ribs, whereas the oil pan used was changed from stamped steel to aluminum alloy. The engine block has 10 oil pan bolts, making the early and late oil pans incompatible. | Production 1992 4.3L with RPO L35 had modified cylinder blocks where a balance shaft are used. The balance shaft are gear-driven off the front camshaft gear; camshafts for use with balance shaft motors have a longer dowel pin, which cannot be interchanged with non-balance shaft engines. The current engine block in production since 1995 eliminated the front and rear freeze plugs with extra strengthening ribs, whereas the oil pan used was changed from stamped steel to aluminum alloy. The engine block has 10 oil pan bolts, making the early and late oil pans incompatible. | ||
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| + | ==Cylinder Heads== | ||
| + | The cylinder heads used on the 200 and 229 had 58cc combustion chambers using perimeter-bolt valve covers (valve cover bolt pattern same as the SBC). 1985-present 4.3L cylinder heads came standard with 64cc combustion chambers, swirl port intakes and centerbolt valve covers. 1996-present had the use of the Vortec head (similar in design to the one used in small blocks). | ||
==Displacements== | ==Displacements== | ||
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