Notes on 351 Cleveland Identification

bric — Thu, 05 Nov 2009 02:09:51 +0000

It has recently come to our attention here at Bric Rods that quite a few people do not know the visual differences between four barrel Cleveland heads and two barrel Cleveland heads for the 351. To that effect, here is a quick determination. First off, if it has an aftermarket aluminum manifold on it, most of the 4V variations have that information cast into the manifold, particularly Edelbrock. These will indicate on the top, just behind the distributor whether the manifold is for the 4V or 2V with the appropriate 2V or 4V cast into it.
If the manifold fails to show this, a somewhat more labor intensive process is required, as no significant difference is noted on the outside of the heads themselves. One can tell by removing the valve covers and looking at the intake runners in the heads, as they will be slightly higher/larger, but this is a difficult determination if a comparison is not readily available. Otherwise, removal of the manifold is required, and recommended, at which point one can simply compare the size of the intake ports to the size of one’s fist. Though somewhat non-technical, it is a good determinate, as 4V heads will be close to the overall size, knuckle to knuckle, whereas the 2V heads are blatantly undersized when compared to the average fist.

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Notes on 351 Cleveland Identification