i am gathering parts for a 509 build.i have a set of the eq 320s on their way to me.also just got some 525 efi cams.going to go with app 9.5 to 1 c/r.i have a nice 850 carb but also have a 1050 dominator to try.joe,if you get a chance can you enter the info on your desktop dyno and see what it sais.i am thinking 600 hp.

You gotta love Mike at High Flow! Your intake #`s is better than mine and a smaller head should have more velocity.. I don`t like this at all!!!
Can`t wait to see what they dyno at, should be a killer combo.



Mike, these things are not going to install themselves, stop thinking about a 509 and EQ heads

starboard short block will be finished by the end of day tomorrow.

rockin and rollin!

I must say pretty good flow numbers! im impressed

That should be a nice combo! I am interested to see how that dyno's. My next boat engine refresh will be very similar to this plan except possibly efi.

I must say; I'm pretty impressed with those numbers.... Alex; told me last week, that was a decent head out of the box....
Cast iron port work, not very fun at all....

Joe, No back cut....... Laziness.... just imagine someone taking the time to dye the valve and lap it to find the edge, then grind the valve at 30 degrees...

Mild, how many hours of port work went into one head ?

Still havent got a total on that.

Also, fwiw, flowed with no pipe on exhaust.