will a 87 307 intake manifold, work on a 72 olds 350?

 

Nope. Port mis-match.

 

Just to clarify, the A5 intakes used on the 1985-1990 roller cam 307s have smaller ports than on other small block Olds motors. The A5 will physically bolt up to the 350, but the port mismatch makes that a worthless swap. On the other hand, the A4 intake used on the 1981-84 307s has full size ports and is a cheap way to lighten a 350 (though the manifold is no better flow-wise than the stock cast iron unit).

 

Thanks guys