Editing V6 Chevy 90 degree engines (section)
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==Blocks== The Chevy 90ยบ V6 is formed by the removal of the #3 and #6 cylinders of a SBC. All three V6 engines share the same 4.4" bore spacing and 9.025" deck height of the SBC engine. Production 1992 4.3L engines with RPO L35 had modified cylinder blocks where a balance shaft is used. The balance shaft is 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. The oil pan used was changed from stamped steel to an aluminum alloy casting. The engine block has 10 oil pan bolts, making the early and late oil pans incompatible.
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