"350" Chevrolet Bolt Pattern from the introduction of the V8 in 1955 untill the LS1. Note the lack of the top cernter bolt.
"BOP" Buick iron blocks after 1966, Oldsmobile after 1964, Pontiac after 1964(See 389-350), Cadillacs after 1964
"Unicase" General Motors multiple bolt pattern case for Chevrolet and BOP
"350MT" After 1955 on GM cars/trucks. Most often trucks have a 5 1/8" center register cars measure 4 66"
"Cad Lasalle" Long input, bearing retainer not bolted to trans. top shift or side shift. Fort must be sealed to bellhousing.
"318" Small Block Mopar. Starter bolts to the case on the drivers (US) side. Ring gear is on the torque converter.
"426" Big Block Mopar.Very similar to "318" but will not interchange. One engine bolt hole just below lower starter bolt.
"A833" Mopar used a multitude of bolt patterns and transmmissions, Best not to guess on these. One charateristic is a very long pilot diameter.
"302" 6 bolt pattern small block Ford. Starter bolts to passenger side (US).
"FE Ford" Starter is high on Pass. side.
"460" Largest BH bolt pattern of the bunch. Pass side starter.
Ford "Modular" motor
"292" 1949-1964 Ford Tall and narrow pattern. Can have 1 3/8" or 1 1/16" input shaft diameter.
"EFM" Early Ford Mercury. 1932-1948 Ford V8. Round with 8 bolt holes and 2 3/8" dowel pin holes. 1 3/8" input.
"T56" Borg Warner 6 speed. Common bolt pattern but multiple input shaft lengths. GM, Ford and Chrysler all used this transmission. Best bet is to identify original application and year. Versions that originally had the "Pull" clutch styles can be difficult to adapt.
Borg-Warner built this transmission beginning in the early 80's and another company under licence continues to do so. Multiple applications including imports. The left unit is a GM 4 cylinder version with the fine spline input and the tall narrow pattern. There are 2 main bolt patterns; The GM versions mated to the V6 and V8 up to 1991 used the standard Muncie or "350MT" pattern. The GM 4 cylinders and Ford applications used the tall narow pattern. Except for the ones with the "350MT" pattern, input shaft length varies according to the application and year so it is best to call with a measurement if using the Ford T5 or GM 4 cylinder version.
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