72 (C3) Clutch

[Rob C.]

Could any one tell me if my 1972 LT1(non close ratio trasmition) has a 10" or a 11" clutch in it with out taking it apart? Thank you, Rob

[John H.]

Re: 72 (C3) Clutch

Rob -

It was originally built with a 10.5" clutch and 153-tooth flywheel, and should have a 3858403 bellhousing - number is visible on the passenger side; if it has that bellhousing, it has a 10.5" clutch, as the 168-tooth flywheel and 11" clutch used beginning in 1973 won't fit in a 403 bellhousing.

[Joe L.]

Re: 72 (C3) Clutch

John-----

I think you must have your "Camaro hat" on. For Corvettes, virtually all LT-1s used an 11" clutch with 14", 168 tooth flywheel and bellhousing GM #3899621. The only exception was 1970-72 Corvettes with ZR-1. With that option, the 10-1/2" clutch with 12-3/4", 153 tooth flywheel was used with bellhousing GM #3858403. 1970 used a 10 spline input shaft and clutch friction disc for all applications; 1971-72 used a 26 spline input shaft and clutch friction disc for all applications.

For Camaros, all 302 Z-28s used the 10-1/2" clutch with 12-3/4", 153 tooth flywheel and 3858403 bellhousing. However, 1970+ Camaros with LT-1 used the same set-up as LT-1 Corvettes (except ZR-1).

[John H.]

Re: 72 (C3) Clutch

Joe -

Yup, had the wrong hat on - brought the '69Z out of winter hibernation yesterday, must have had it on the brain. So many hats, so little time

[Joe L.]

Re: 72 (C3) Clutch

John------

Well, it's ok if you wear the Camaro hat once-in-awhile, but if I ever see you wearing it with the bill facing rearward, I'm going to be very disappointed in you.

[John H.]

Re: 72 (C3) Clutch

Joe -

Not likely - I have it on good authority that wearing a ball cap backwards automatically reduces the I.Q. by fifty points, thus causing orange spiked hair and body piercings to appear