ProComp/Speedmaster aluminum heads

PRH said

I’m not going to say, however it can be whatever you want, but no flycutting of the pistons is allowed.

I will say...... it’s probably less duration than you might think.

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LOL..... I have a friend that went 11.3's in a full size dodge truck/360 in stock eliminator. Starts with 5k stall converter, 5.13 gears, and duration that only opens and closes the valve twice down the track... LOL But cast intake, TQ, and factory lift cam breathing through 1.88 valves :)