Quote:
Originally Posted by unruhjonny
interesting thread here...
I have never read of non-SD post 1972 455 block being drilled and tapped for four bolt mains;
And have understood that some 1971 non-455HO blocks were drilled and tapped...
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All 455`s I`ve seen are drilled for 4 bolts till `75, when the casting number changed and started with a "5". Even in `74. I`ve got a spare `74 YY block here that is 4 bolt with 2 bolt caps.
All the `75 and `76 455`s I`ve seen have been 2 bolts not drilled for 4 bolts. `73 seems to be the last year for the windage trays also, at least on non sd`s.