Quote:
Originally Posted by KO
very very common in 1970 blocks, I have not seen a 1970 400 block that did not have the extra holes.
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I have a spare 400 (XH code) engine out of a 1970 Grand Prix that only has 5 of the 6 extra drilled and tapped holes. The 6th hole is only partially drilled. Drill bit must have broke during the drilling operation and because it was to have 2-bolt caps it wasn't worth reprocessing the block to complete the drilling and tapping of that 6th hole.