I've got 2 of them and have been told 11. inch and 10.5
I can't find any info on the net for #'s on these units. I think they are 11.'s.
Any input would be great..

Hey redrider I saw this post a while back. I hope it does something for ya.

http://www.camaros.net/forum/Forum9/HTML/000567.html



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1968 Coupe (http://www.camaros.net/cgi-bin/xchange/xchange.cgi?search_and_display_db_button=on&db_id=313&exact_match=on&photo_size=full), 327/210hp project in process.
PS/PB, Factory AC

I also read this coming from the same guy:

"#3899261, is said to be an 11” bellhousing"

If we're talking first gens, the XXXX403 is a bellhousing for 10.4 inch clutch and 153 tooth, 12.5 inch flywheel. It uses the starter with 'in-line' bolts/mounting. The XXX621 is for the larger 11 inch clutch and 14 inch, 168 tooth flywheel and is coupled with the starter that has the offset mounting bolts.

Hope this helps.

Guy's, does the bellhousing for the little flywheel have a wider flange and is smaller in the "bell" area when it is compared to the big flywheels b/h??

I plain don't think I've seen a little f/w b/h! pdq67