1966 GTO Headers advice
I am somewhat new to engine mechanics so please bear with me. Recently purchased a 1966 project GTO, and have a couple of questions. Does D port refer to the shape of the opening in the cylinder heads? My heads are 78 and the two middle openings are shaped like back to back D. The other two are more oval in shape. The engine is a 389 out of a 1966 B body. Any suggestions on headers? Thanks
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