Quote:
Originally Posted by olddog
Strangely, as I waited to fall asleep last night and my mind wondered, I was wanting to know what a 4.125 bore x 4.0 stroke Windsor with a Cleveland 4V head would do. The CHI 3V would do and the 0.030" overbore is close enough. Sadly though you went and put a radical cam to far from my idea to compare, and the compression is just shy of a diesel.
Well I know that's because a customer wanted it that way, but what about my curiosity? If you put a nice hydraulic roller cam in the 230-235 duration @ 0.050 range and a modest lift of .575 or so, with a nice 10.5 compression ratio in this engine, what would you expect on the dyno. Appropriate intake and carb of course. Obviously It would not need all the expensive stuff, but cost is not my curiosity.
I know it takes a lot of audacity to ask for such free information, but since you are such a nice guy I thought I would take advantage of you.  |
A factory 4V wouldn't come close to what these heads do. A 4V Cleveland head is a 270-280 cfm head without any work. The 208/225cc CHI heads approach 320-330 cfm out of the box. Now, with that being said, without cam and compression, you probably wouldn't expect much more than the same combination with a set of Trick Flow heads or larger AFR heads.
However, there is indeed a cap to the inline valve heads, whereas the canted valve heads will keep on going. It's not uncommon to see these CHI and BT canted valve heads hitting 400 cfm.