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Aluminium Bell Housing Fit For 1959-1988 Chevy 621, SBC, BBC, 11 Manual 3899621
This bellhousing is a replica to the GM 3899621. This Southwest Speed 11" Performance Cast Aluminum Bellhousing is a reproduction of the original 3899621 bellhousing used on GM models with Big Block & Small Block engines equipped with an 11" clutch. This performance aluminum bellhousing does not have the GM Part # 3899621 casting number but will look, fit, and perform just like original. If you are doing a restoration of an early muscle car, or just want the correct bellhousing to finish that rod project, this bellhousing is the perfect part! Replaces GM Part # 3899621.
Works with GM transmissions with a 4.675 O. Clears 168 tooth 14" Flywheels with factory 11" clutch discs.
1/2-13 tapped hole for z-bar manual clutch linkage, if needed. Fits ALL Small Block & Big Block Chevrolet engines regardless of factory clutch size. With Manual Transmissions & 168 tooth Flywheel.
The bellhousing was used with 4 speed transmissions in 66-72 Chevelle, 66-81 Corvette, 67-72 Camaro, 68-72 Nova, & 64-81 Impala, but with any GM transmission that measures 4.675" and an 11" clutch, it will fit great in all of the additional applications shown above, as well as many different types of projects. This will make it a snap to get that big GM bellhousing in your muscle car or rod project. This new Chevy high performance 11" style aluminum bellhousing was issued on Camaros, Chevelles, Impalas, Corvettes & Nova's with big block 396, 427, & 454 engines, as well as Yenko, Copo, & ZL1 and also small blocks like 302, 327, 350 & 400 with the 168 tooth, 14" flywheels and 11 clutches, including Z28, Yenko, & Deuce models.
Will accept your original Muncie or Saginaw Manual Transmission with a 4.675 O. Will even work with the Tremec 5 & 6 Speed Transmissions. You can use one of the new bolt-in Classic Car Conversion Transmissions and still use all of the Stock 4 Speed Pedals and Rods with this bellhousing.
Will not work on Monza or Vega as they both used a cable operated 10.5 clutch with the pivot on the other side. The clutch fork was also angled about 45 degrees, not straight across.