P-dude said """"""Personally I don't know why the shop 4 bolted that block? Makes it even weaker in that area.""""""
Matches my sentiments.
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Overall, Thusfar, I have not seen a so-called "stronger PMD block" in this thread. My examples: 425A, early SD, 73SD, Ram V.
I dare to summarize that the "stronger STOCK blocks" of folklore are not better-enough in the Main Web to be siginficant. My non-methodical pathetic homework was to compare MAINs by visual inspection on the 68-350, 67/68/69-400, 67/68/68-428s, and the 70/71/72/73/75-455s. The 60s-68 showed more meat behind #1 than the 69s'-75s' thin front wall. We're not crackin the front wall are we.
My only valuable opinion on this is the 67-400 showed a bit more in #2 #3 #4, while even my YK 428 4-bolt blocks (Nov 1966, Dec 68) did not show a real value in #2 #3 #4. My 67 428 block had a casting-breach (a gaping hole) in a #3 Main Cap inner bolt-boss. That held together with a 455 N-crank and Stock Caps to 12's over 200+ runs just fine. That as-cast "gaping hole" would fail everyone's visual inspection if it got photo'd and posted.
We can be glad the MRs and IAs are out there...
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