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Can I put Chevy valves in my small block Ford heads?


Yes. This is a pretty common swap for early 289-351W heads. Both Ford and Chevy heads use 11/32" valve stems and are very close in length. The 1.94" and 1.50" Chevy valves fit nicely into the athsmatic Ford heads. A little pocket porting and gasket matching goes a long way with this swap. The trick is though, you MUST un shroud the valves in the combustion chambers. Bigger vales do NOT mean you'll get more flow. In fact, you can actually LOSE flow by having valves that are too big and shrouded by the walls of the combustion chamber. The bigger the valve, the closer it gets to the wall of the combustion chamber. The area between the valve and that chamber wall MUST be machined for more clearance so the incoming fuel and air charge can get around and past that chamber wall and into the cylinder. I show this pretty extensively and clearly in my "Heads, Porting & Valve Trains" DVD set.


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