Thanks, was not sure when the exhaust port changed.'87 engines are Gen 1 SBC's. Those ports are pretty close to being the same from '55 to the current Gen 1 crate engines. Only differences would be the addition of the 7th exhaust manifold bolt (after '75), change to center bolt valve covers ('87), the change with intake center bolt angles (sometime after '89), the removal ot the intake center bolts (Vortec's). Believe exhaust manifolds for Gen 2's (LT's) can work on the Gen 1's heads.
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