Starfury

Ok, fair enough, but the cleveland heads are still a great design for producing power, especially for something built 40 years ago.

And Pascal, I bet that Torino had a 351M in it

THUMPIN455

If the bolt pattern was different it was not a Cleveland. I am using the C4 that was behind the 302 in my Cougar with a 2V Cleveland from the pit of despair. It bolted in like it was meant to be there. Same mounts, same transmission, different headers. I am using the headers from the 71, since they fit no problem. It has a 302 flexplate as well.

One thing about Clevelands that is annoying when building them is the pedestal rocker arms that lack adjustability with some cams. An easy fix is milling them flat and using screw in studs and poly locks. The BOSS351 had adjustable valve train so it isnt needed with those heads.

The 4V ports have dead spaces in them, filling this space in results in improved airflow and velocity. Here is a pic of the spot. This pic also illustrates the difference betwen the 2V and 4V heads.

The 2V heads flow well enough to achieve 400 hp relatively easily, the 4V can do quite a bit better and they allow more RPM if you build a rev engine. A stroker with the 4V heads does not have the problems of velocity that a 302 with 4V heads has. Dodgestangs 410 needs more airflow and for the price of some epoxy and the exhaust plate he has a serious race engine with mostly stock parts.

The Cleveland head fits the smallest engine I will consider for a performance build, and its the only one under 400ci, and even 400s are small to me. The truth of the matter is the Cleveland, with the right cam, a set of headers, and a good carb will make very good power, much more than a comparable Windsor with stock heads, intake, and stroke. There is no need for an aftermarket Cleveland head unless it is a CHI head or you just cant find one in your area. The stock heads and blocks are not expensive, although some people think they are gold. They are a good engine when building with stock parts and no forced induction.

67mustang302

Yeah, the Clevelands were the only small block engine Ford produced that had a half way decent head. Nothing spectacular by modern standards, but on a decent sized engine they can make good power. For an all out assault on street performance you have to start looking into aftermarket heads, whether it's a W or a C.

REAVER117

I think the 351CJ also had adjustable rockers. The Aussies ('3v') are the best street performers unless you are are installing a serious stroker kit and need a lot of airflow.

pascal

Could very well be then.
Hard to tell what people did to these cars over the years anyway.

Thanks guys.