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I was wondering about that myself rustyBob, with the desciption being "tall" ports, High Riser was the first thing that popped into my head!
I'm running a High Riser and the difference between MR and HR ports is quite remarkable. Different intake gaskets are required due to the size difference.
My setup is a matched set, 1964 heads and 1964 dual four intake. NO HEAT RISER exhaust ports for exhaust flow through the intake on the High Riser's. What about this Offy intake, got heat riser ports?
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