Thread: head flow

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My book shows the same on stock heads ....239/147 @.500 .....but shows the exaust at 160 with pipe @ .500.
All the articles I have read show almost 20 cfm improvement from work to the valve ,with a special back cut, and seat work.But all the articles state keep away from the intake runner if unsure what to exactly do,because with a bigger valve you have to keep the high swirl going.......if not the flow will go down.Most of them say stay away from the short side radius if unsure as it will decrease flow from just opening this up full size on the vortecs.
Can you post some pics and do the valves have back cuts ,if so what are the angles on the back cut and are there 4 cuts or 3?Did they install massive hd seats for the bigger valves or cut down the existing seats ?Did they use oversized valves and hone the guides or install new guides?Whats the stem difference from stock valves to the new valves?Did you flow more than 1 runner on the intake?
I am with Erik those heads would love n2o or a some forced induction the way they are!!!