rschoner

Hi,

I posted awhile back about a rebuilt 302 long block that I got from Kragen that had 351 heads on it and wondered it it was ok.

Based on what I learned here and from the manuals I decided that if they were 351W heads they were ok (except for bolt size that could be fixed by bushings). However, I decided that 351C heads would not work because their combustion chamber volume is bigger then the 351W heads and I would get a lower compression ratio. Also, I think the 351C heads have different water flow (not through the intake manifold).

In trying to verify what I head I have I find that the valves are in-line (351W I think), the valve cover is held on by 6 bolts (351W I think) BUT the spark plugs are small (351C I think). I can not find a casting number anywhere.

Does anybody know if 351W heads ever came with small sparkplugs? Or, what head do I have? Or, how do I find out?

Thanks in Advance,

Bob Schoner

84 Turbo stang

351 w spark plug holes are big. Ther has to be a casting number on the head. Top of the head in one corner.

wythors

Also, Cleveland heads don't fit on a Windsor block without some major machining work. If this has been done, you've basically got yourself a poor man's Boss 302. From your description of the heads, you've definitely got Windsor heads on there.

zemog

actually that would be a poor mans boss 302

tinman

The 351 'casting' number does not mean they are for a 351W. Dunno why Ford did this crap.......

quickGT

"Now a 351 Windsor is really a slightly enlarged 289/302, as it's name implies it comes from Fords "Windsor" engine family (a.k.a. the 90-degree V engine family). The thin-wall cast SMALL BLOCK accepts regular sized spark plugs, uses a timing chain in the block, routes water through the intake manifold, features thin main-bearing caps, a very good oiling system, and uses the same heads for 2V & 4V versions. The heads are are small, utilizing in-line valves with relatively small ports. The valves are 1.78" intake and 1.54" exhaust, i.e. the same size as a 289/302. The valve covers are straight (front to rear), attached by 5 bolts, and when removed you can see 351 cast in the lifter valley. The small side-by side (in-line) valves are the dead give-away."

"The 351 Cleveland, on the other hand, belongs to Ford's 335 engine family. This thin-wall cast BIG SMALL BLOCK uses the smaller 14mm spark plugs, has a separate front cover (bolted to the block) housing the timing chain and routing water - so that water does not go through the intake manifold, features beefy main caps (wide enough to drill for 4-bolt mains), a poor oiling system, and uses different heads for 2V & 4V versions. The heads make all the difference and these fire breathing babies make this motor the legend it is. On the 4V, the valves are HUGE, measuring 2.19" intake and 1.7n" exhaust (don't remember exactly). Valves this large are only possible via a canted valve arrangement, forming what Ford refers to as a "poly-angle" combustion chamber. The valve covers are not straight - the front is flat and parallel to the ground, but a curve twists the rear parallel to the head. They are attached by 8-bolts and when removed, there is a 4 cast into the corner of the 4V and a 2 cast into the corner of the 2V (at least in 1970). The canted valves are the dead giveaway."

musclemustang94

Clevlands had monster valves in 'em too, big block size.

hellas85stang

i think tryue windsor heads got name windsor on them..not sure... whats casting#s ill run them in my books

Blckstng93

Clevelands had canted valves and the valve cover is held on with 8 bolts. The Windsor uses 6.

rschoner

Hi,

Thanks for all the feedback. I think I have some thing unusual, maybe a late model.

My heads have 6 bolt valve cover(like a W), in-line valves (like a W) but small plugs (like a C). I can't see any casting numbers. From a Google search I find that the casting nos. are on the bottom of the head and can not be seen once they are installed. At this point I'm going to put the small plugs in and fire it up. I'll report the results (especially if they are loud and spectacular) :-)

Bob Schoner