Hello everyone, This question was actually asked 8 years ago, but I did not find a response. I ordered the Ram Air Restorations oversized manifolds for my 67 GTO with a 400. RAR doesn't mention it, but on Butlers website there is a note that states, " WILL NOT FIT 1964-67 FRAME WITHOUT...

Hello everyone. I recently purchased a 1967 GTO. The car originally had a 400ci with 335 hp “YS” code with an automatic transmission. However it now has a 455ci the engine based on the numbers next to the timing cover (starting with 22P) it was originally in a 1972 Pontiac. This 455ci has “YC”...