original GM 3899621 bell housing

[Bill Pritchard]

Correct for second gen Z28s thru 73, and probably 74 as well.

[BARRY]

Originally Posted by Bill Pritchard

Correct for Z28s thru 73, and probably 74 as well.

HI correct for big blocks 1967-1971

[Lynn]

Originally Posted by Bill Pritchard

Correct for Z28s thru 73, and probably 74 as well.

Actually, not correct for Z/28, 67-69. They use the 403.

Also not correct for ZL1. For some reason that application uses the 403.

70 and later (at least through the early 70s) Z/28 does use the 621, as does 70 and later LT-1 Corvette.