66/67 BB Bellhousings

[Richard S.]

Do the 66/67 judging guides not deal with the casting numbers of bellhousings? Are these not judged at all? What are the correct casting numbers for 66 427/390 and 67 427/435 cars. Thanks.

[Mark L.]

Re: 66/67 BB Bellhousings

Rick, The 66 bellhousing is 444 and the 67 is 621 for big blocks. The complete numbers are present in the manuals. Good luck. Mark

[Joe L.]

Re: 66/67 BB Bellhousings

Rick and Mark-----


Yes, most, if not all, 1966 Corvette 427s used bellhousing GM #3872444 and 1967 427s used bellhousing GM #3899621. These bellhousings are, I believe, functionally interchangeable, though. Both are designed for use with a 14"flywheel(168 tooth ring gear)for an 11" clutch.


1964 thru 1967 Corvettes with 327s and 1965 Corvettes with 396 used bellhousing GM #3840383(sometimes identified by the number 3858403). It is possible that some 1966 L-72s also used this bellhousing. This bellhousing is designed for use with a 12-3/4" (153 tooth ring gear) flywheel for a 10.4" clutch.

[Richard S.]

Re: 66/67 BB Bellhousings

Where in the 66/67 judging guides can I find the specifics on bellhousings? Thanks.

[Wayne M.]

[Richard S.]

Re: 66/67 BB Bellhousings

Wayne, thanks for helping me out re. the bellhousing judging. It looks like Dan in Hamilton may have grills I can get in a hurry.