My favorite was a 4.125 stroke engine.It was in my factory alu V block.I will tell you now,dont expect a huge change in seat of the pants feel!Its just another air pump!You want to build a unique looking pontiac engine,I understand that.Dont be taken back when someone asked you why you put a ford in your pontiac!The 3 Cs are required for a proper package.Carb(induction),cam and Compression.Don did one of my V engines and it was a great package.I could take you for a ride in my 421 tempest,wont fell any diff with V heads or SD heads with the 3Cs being equal.Build your dream,enjoy it and dont look back.Im lucky being old,bleeding RA V and know where the bodies are buried,I can make a call and buy run ing factory V headed engine today.Tom
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