Hey guys, Here are the flow figures from my PORTED 364 heads. I could not remove material in some of the critical areas due to lack of thickness in a couple of ports. Anywho, here is some flow for the 889 casting I have. 1.9 intake valve, under cut, back cut and only 11/32 stem. 1.5 exhaust valve, under cut, back cut, and 11/32 as well. .100- 61.8- 50.1 .200- 129.1- 88.9 .300- 175.5- 115.8 .400- 204.4- 130.1 .500- 213.4- 133.0 .600- 216.9- 135.3 .700- 219.5- 136.1 Nothing great but not bad considering the minor amount of bowl work, guide and stem size. Mike :3gears:
Do you have the stock numbers for comparison on intake and exhaust? I'm pretty dim on porting, so forgive my foolish questions. Is the minor flow increase at higher lift indicating valve shrouding, or limits of valve and port area? Any before/after pictures indicating where the gains were achieved? Thx!
I don't have the initial flow numbers here with me. I do remember that they peaked around 500 lift and never saw over 195 on the intakes. Exhaust never gained over 110 or so. That's all the way up past 700 lift too. Mike
Is the stock flow for the 364 heads the same as 401/425 heads? I've seen the numbers for those. See this post.
