Direct Connection ( Mullen LA ) heads

moparallen said

I think a 15 degree angle on the valve face will also bring the numbers up but I haven't tried that yet. These are tulip style stems and the port work is impressive. But I can see only 2 angles on the valve face and the 15 degree back cut may help? Maybe one day I will get to it.

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If you are talking about a 15 degree top cut on the intake valve do not do that. You will kill power so fast your head will spin.

You can put a radius on the exhaust valve but never do that or a cut on the intake valve. Some call it clipping the valve. That’s a big power loser, but it looks good on the flow bench.