Quote:
Originally Posted by unruhjonny
interesting thread here...
This has actually intrigued me some;
I have previously understood that most 1970 400 blocks were drilled and tapped for four bolt caps;
But generally speaking only the "YZ"-L74/at, "WS"-L74/mt, & "WT"-L78-mt blocks received the four bolt caps - and even then, not all received the four bolt caps;
I have read that the likeliness of a WS blocks getting the four bolt caps was pretty much guaranteed;
I have read that the YZ blocks getting the four bolt caps was almost all the time;
I have read that the WT blocks getting the four bolt caps was more common than not...
I have never previously read of post-1970 400 blocks being drilled and tapped for four bolt caps.
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...
I have a 1972 "WS" 400 block (complete & running) as well as another 1972(? maybe 1971) 400 short block that I am now curious to check for main caps...
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This is a 1970 WT block drilled for 4 bolt caps but had 2 bolt caps installed. My 1973 455 in my '66 Tempest Custom wagon came out of a Grand Safari. It has 2 bolt caps on a block that is drilled and tapped for 4 bolt mains. I recently helped another buddy of mine with a '73 455 out a a Grandville convertible that had 4 bolt caps installed.