Chevy Bellhousings

Arguably the most popular and consistent pattern of all time, the Chevy Small Block pattern has remained virtually unchanged since 1955. The LS engines introduced an additional hole at 12 o’clock and added structural oil pan attachments, which for most versions are the same. We have several of the latest enhanced castings to meet your needs whether it’s an old school 283 or an LS3 Crate engine.

Product & Features

Chevrolet pattern, Gen I & II small 4-11/16” bore

Chevrolet pattern, Gen I & II large 5-1/8” bore

Chevrolet pattern, Gen III & IV small 4-11/16” bore

Chevrolet pattern, Gen III & IV large 5-1/8” bore

These bellhousings are all cased from the highest quality aluminum alloy and the most current enhanced pattern. All will accept large 168 tooth flywheels and up to a 12” clutch.

All the kits above for Gen I & II include the bellhousing, lower cover and boot
All kits above for Gen III & IV include the bellhousing and boot.
Pivot studs are sold seperatly with regards to your specific pivot arm.

Applications & Compatibility

Engines

Fits 1955 on Chevrolet V8 pattern engines which includes

Chevy Small Block
Chevy Big Block
90 degree Chevy V6 (4.3L, etc.)
Chevy inline 6
LS Gen 3+

The LS Gen 3+ bellhousing has the hole at the peak of the bellhousing (12 o’clock) and the correct holes for most stock oil pans. There are a few applications that use odd locations for those lower holes that will not line up. In that instance, you can replace the oil pan with a standard type or leave those bolts out.

Transmissions

All bellhousings have the standard GM bolt pattern on the rear/transmission side. The large 5-1/8” bore are specifically used with the SM465. Most other transmissions will use the small 4-11/16” bore version. A large bore can be stepped down with our BR4 centering ring available below.

5-1/8” bore versions

SM465

4-11/16” bore versions

Any transmission that accepts the standard GM pattern will work.

Related Products

The BR4 ring is used to enable use of the SM465 5-1/8” bore bellhousing with 4-11/16” retainers.

Adjustable release bearing

While sometimes not needed in this application, it is priceless when clearances dictate its use. With all the variabilities in flywheel and clutch height, we highly recommend its use. Further information is here.