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Can someone please enlighten me to the difference between Impala rams horns, 63 Corvette rams horns etc. Is it just the alternator bracket cast on ? etc
Before you decide anything, suggest that you also look at Speedway Motors TRU-RAM exhaust manifolds. These are 2 1/2 inch cast, smooth, and available in either cast iron or stainless, plain or polished.
Another good option is C4 manifolds. The TPI cars have a true 2 1/2" outlet shorty header. The LT1 cars have a cast iron manifold with 2 1/2" outlet. Both will fit a C3. I have the TPI manifolds on my car.