Reply to "engine number on ID tag"

coreypriceMember

Not to beat a dead horse, but the Ford Performance book quotes Roush as saying "virtually any 351-C block can be used, since there are no differences in materials or strength. In fact, the two-bolt main cap block is just as good as the four-bolt block. Even the caps seem to be equivalent in strength. So, unless you already have a four-bolt block, don't spend the extra bucks for this feature" (Ford Performance, quoted from Car Craft, Aug. 1976). Doug Cook also said that he feels it does help to control walking... though it's not necessary. Ford Performance warns against drilling the 2-bolt caps as it might weaken them.

I think that there is a logical reason why the blocks are the same for 4-bolt and 2-bolt mains after a while. I understand that both use the same block casting with provisions for 4-bolt mains (probably used the same casting for economy); and I would bet that the holes for the mains were drilled after.

12/31/097:52 PM

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