Hi guys is the intake opening on the 5.3 heads the same dimensions as the LS6? I'm not talking about the runners or design, but only the opening itself. I have a FAST intake ported to the LS6 openings, and need to know if the intake matches the 5.3 ports as well.

Thanks

 

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Yes they are both cathedral port heads.

 

Thanks John! They looked similar in pictures, but I wanted to be sure they were the same dimensions. For the record I did first