As best I can tell where there are two similar motortype numbers, one even and one odd,
the odd number is for the AT version.
I went out to my garage and checked all the blocks I have (B20/30)
and here is what I found:
498284: A 6-bolt D-jet engine in the Yellow Peril (73 145E) NOT the original engine.
498285: A 6-bolt big bore short block I got from Ernie Olsen in Connecticut, 1 bad piston.
498196: Originally an 8-bolt B20A engine. I bought the block bare naked in Panama when the original big bore split a cylinder because of a 5/16" hex nut cocking the piston in the too-thin bore. Now has 6-bolt innards and burnt rod bearings (a long story)
498100 (2 of these) 6-bolt B30E or F blocks believed to be 1972. One came from the mountains of Panama after tradein to the dealer because of FI problems. The other came to me from Bruce Young (Lucid) from a car badly rusted out.
498101: 6-bolt 1972 B30F engine that came to me from Kent in SD. Originally AT but converted to an M410 tranny.
From the above the ONLY 8-bolt one, as best I can tell, is 498196, NOT the latest number.
So apparently later than some arbitrary cutoff number does NOT necessarily mean 8-bolt!
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George Downs Bartlesville, Oklahoma