[Daniel Jones]

> The Cleavor was originally a combination of the 351 Cleavland heads
> with a 351 Windsor block (yes they would bolt on).

Yes but that is quite different than the Fontana aluminum block
which is a true hybrid of Windsor and Cleveland features.

> Also, I believe there was a special pistion required

You needed pistons with valve notches to match the canted valves of
the Cleveland heads and a pin height to match a 9.5" block.

On the Fontana block you can run either Windsor or Cleveland heads
and the pistons need the corresponding valve notches. The high
port Motorsport heads (A3/B351/C302) were the racing head of choice
for the sprint cars.

> A special intake manifold was required to mate the two.

The intake company was B&A though they are now sold through Bush.

> I never heard of a special block, however, the Cleveland heads needed
> to be modified (coolant holes drilled and plugged).

For the Fontana, the high port and Yates heads are set up for either
(come with screw-in plugs). Windsoe heads bolt right on.

Dan Jones