What Bellhousing to use

[William L.]

Have a friend building a hot rod wants to know if he can use a 621 or 421 bellhousing with an 11" clutch?? and I don't know if it will fit with ether or??

[John H.]

Re: What Bellhousing to use

The 621 will work fine with an 11" clutch (and 168-tooth flywheel); the 421 won't - that was a one-year-only housing for 10.5" clutches used only on 63's with a "small" transmission front bearing retainer hole.

[William L.]

Re: What Bellhousing to use

Thanks John. Thats just what we needed to know. Thanks again. Bill

[Joe L.]

Re: What Bellhousing to use

Thanks John. Thats just what we needed to know. Thanks again. Bill

Bill-----


He can also use a GM #464697 IF he finds one with the clutch fork ball stud on the UPPER side of the elongated ball stud boss. These can be picked up cheaply at swap meets since very few folks want them. Actually, a bellhousing with a 464697 casting number and a ball stud boss as described is a GM PART #3899621 bellhousing. Some were used in later PRODUCTION, possibly even on late C3 Corvettes, and many were sold in later SERVICE. Hardly anyone knows that, though. The 3899621 bellhousings usually sell for top dollar because they have the "right" casting number. For a street rod, casting number is about as inconsequential as anything could be, though.