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This is a big port conventional 23º head designed for nitrous or larger NA engines. Special Jesel rocker system custom made for it. Pro-Filer USA made core. Oil drain back machined in.

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2.140/1.580
265cc port
3.05 in² pinch
3.02 in² MIN @ throat
50º seats










 

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The port still has .100 of material in the PR area. I think with a bigger lifter and some tweaking you can get a big pushrod with a .450 offset.

Two port are touched like this.


I got 1,000 lbs of aluminum coming, I see some .550" offsets in my future....
 
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