GM / Ford / Chrysler Bellhousing Patterns

GM / Ford / Chrysler Bellhousing Patterns

GM bellhousing patterns

Chevrolet V8 pattern
So named because it began with Chevrolet's V8 engines.
* Chevrolet big-block V8's
* Chevrolet small-block V8's
* GM Vortec 4300 90° V6
* GM Iron Duke RWD inline 4 (Early RWD Variants, later versions may use a FWD pattern, and have two possible starter locations)
* Jeep with GM Iron Duke inline 4 2.5L/151 in³ (1980-1983). 
These use a Chrysler custom Torqueflite 904 automatic transmission with an integral Chevrolet bellhousing.
Do not confuse with later AMC 2.5 L engine that uses GM small corporate pattern (see below).
* Chevrolet Inline 6 (post-1962)
* Chevrolet 153 Inline 4 (Chevy II, pre-Iron-Duke - includes the Vortec 3000/181 industrial/marine crate motor)
*GM Atlas engine
*Detroit Diesel 6.2/6.5L V8
*Duramax V8
*Generation III V8's

GM metric pattern
Also called the GM small corporate pattern and the S10 pattern.
This pattern has a distinctive odd-sided hexagonal shape.
Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block than front wheel drive.
The 2.2l S10/Sonoma had the starter located in the same position as front wheel drive cars.

* GM 60-Degree 2.8/3.1/3.4/3.5/3.8/3.9 L V6 (also used by AMC)
* Buick 3300/3800 V6
* Cadillac HT4100/4.5/4.9 L V8
* Isuzu 3.5L DOHC V6
* AMC/Chrysler 2.5L I4 found in Jeep Cherokee, Comanche, Wagoneer, CJ and Wrangler and Dodge Dakota
* GM Iron Duke/Tech-4 2.5L I4
* GM "122" 1.8/2.0/2.2 L I4
* GM 5.3L LS4 V8
* GM 3.5L LX5 "Short Star" V6

Northstar pattern
Nearly identical to the GM small corporate/metric pattern, except that the starter is located between the cylinder banks, and the lower right bolt hole is moved outward by roughly one inch. Being nearly identical, it too has the distinctive odd-sided hexagonal shape.
These engines can be fitted in Rear Wheel Drive vehicles with the right bellhousing and are used in hot rods, kit cars, sand rails and late model engine swaps.

* All Cadillac Northstar V8's
* Oldsmobile Aurora L47 V8

Pre 1964 Buick and Rover V-8 Round pattern
* 1961 through 1963 Buick/Oldsmobile/Pontiac 215 Aluminum V-8
* 1967 through 2004 Rover V-8 based on the GM 215

Buick, Oldsmobile, Pontiac (BOP) V8 pattern
* Post-1965 Buick/Oldsmobile/Pontiac RWD V8's
* Buick Big Block's and post-1963 Small Block V8's
* Buick pre-3800 90° RWD V6's
* Jeep "Dauntless" 225 in³ oddfire V6 (1967-1974) and Buick 350 V8 (1969-1970)
* Cadillac cast iron V8s after 1967 (1968-85 472 and 500, 368 and 425)
* Starters are on the left (drivers) side on Olds 350-455 and Pontiac and the right (passenger) side on * Cadillac 425/472/500 and Buick 225/231/3800/300/340/350/400/430/455.

Cadillac V8 pattern, pre-1967
Early Cadillacs manufactured before 1965 used a "round top" bellhousing very similar to early Buicks; around 1965, the bellhousing pattern was revised until the BOP bolt pattern was adopted in 1968.

GM 4-cylinder pattern
* GM Quad-4 Engines

GM Ecotec 4-cylinder pattern
* GM Ecotec Engines (L850 Engine )

GM High Feature V6 pattern
* GM High Feature Engines ( HFV6 )


Ford bellhousing patterns

Ford Flathead engine pattern
* 221 V8
* 239 V8 (pre-1949 cars, pre-1948 trucks, post 1947 trucks with factory adapter housing)
* 239 V8 (post-1948 cars, post 1947 trucks)
* 255 V8

Lincoln Y-block pattern
* 317 V8
* 341 V8
* 368 V8

Ford Y-block pattern
* 239 V8
* 256 V8
* 272 V8
* 292 V8
* 312 V8

Early MEL pattern (1958-1960, Same as FE)
* 383 V8
* 410 V8
* 430 V8

Late MEL pattern (1961-1968)
* 430 V8
* 462 V8

FE Gen 1 and Gen 2 pattern
* 330 FT V8
* 332 V8
* 352 V8
* 360 V8
* 361 FT V8
* 390 V8
* 391 FT V8
* 406 v8
* 410 Mercury V8
* 427 V8
* 428 V8

Early Windsor V8 pattern
* 221 V8
* 260 V8
* 289 V8 (made before August 3, 1964) - had five bolts holding bellhousing to block

Later Windsor V8 pattern
Note: this is commonly called the Ford Small-block V8 pattern, though it is used in some "big block"-sized V8's as well as some V6's and I6's.

* 200 I6 1978-1983 only, partial (4 of 6 bolts) pattern.
* 250 I6
* 255 V8
* 289 V8 - (made after August 3, 1964) - had 6 bolts holding bellhousing to block
* 302 Cleveland (Australia)
* 351 Cleveland V8 (not the 351 Cleveland M-block engine)
* 351 Boss
* 351 Cobra Jet
* 302 Windsor V8
* 351 Windsor V8
* 400 Cleveland M-block V8 aka 400FMX (certain 1973 casting numbers D1AE and D3AE, mated to the FMX transmission)
* 3.8/3.9/4.2L Canadian Essex 90° V6 (RWD only)
* 240 I6
* 300 I6
* 4.6L Modular V8 (first two casting runs, numbers F1AE and F2VE)
* 5.0L V8
* 5.8L V8


335/385 Big Block V8 pattern

335-Series (M-Block)
* 351 Modified M-block V8 (Not to be confused with the 351 Cleveland which uses the small block V8 pattern)
* 400 V8 (except some 1971 and 1973 late Windsor-style castings)

385-Series
* 370 V8
* 429 V8
* 460 V8
* 514 V8

Taunus pattern
* 1.2/1.3/1.5/1.7L Taunus V4
* 1.8/2.0/2.3/2.6/2.8/2.9/2.9 Cosworth/4.0L Cologne V6

Falcon Six pattern
* 144 I6
* 170 I6
* 200 I6 (through 1977; 1978-1983 have partial late Windsor pattern)

Early OHV Six pattern
* 215 I6
* 223 I6
* 262 I6

UK Essex pattern
* 2.0L Ford Essex V4
* 2.5/3.0L UK Essex V6

Pinto EAO I4 pattern
* 1.6L/2.0L EAO I4

Pinto OHC RWD pattern
* 1.3/1.6/1.8/2.0/2.3/2.5L OHC I4 RWD

Vulcan V6 pattern
* 2.3/2.5L HSC FWD I4
* 3.0L Vulcan V6 (FWD and RWD)
* 3.0/3.2L SHO V6
* 3.8L Canadian Essex 90° V6 (FWD only)

Duratec pattern
* 2.5L/3.0L Duratec V6
* 3.4L DOHC SHO V8

Modular V8 pattern
* 4.6L SOHC/DOHC V8 (later castings, F3VE and up)
* 5.0L Coyote DOHC V8
* 5.4L SOHC/DOHC V8
* 6.0L Navistar Power Stroke DI turbodiesel V8
* 6.2L Boss SOHC V8
* 6.4L Navistar Power Stroke DI twin-turbo diesel V8
* 6.7L "Scorpion" Ford Power Stroke DI twin-turbo diesel V8
* 6.8L Triton SOHC V10
* 7.3L Navistar Power Stroke DI turbodiesel V8 (1994.5-2003 only)[citation needed]

IDI/early Power Stroke pattern
6.9L International Harvester IDI diesel V8
7.3L Navistar IDI and IDI turbodiesel V8


Chrysler bellhousing patterns

A/LA/Hemi pattern
* 241/260/270 in³ "Semi-Hemi" A-series V8
* 277/301/303/313/318  in³ "Plymouth Poly A-series V8
* 326 in³ Red Ram 326 A-series V8
* 273/318/340/360 in³ small block LA-series V8
* 238 in³ LA-series V6
* Magnum 3.9 liter LA-series V6
* Magnum 4.7/5.2/5.9 liter LA-series V8
* Viper 8.0/8.3 liter LA-series V10 (This engine has similar bolt patterns to the LA/Small Block except that the top holes on the Aluminum V10 will not align with any other LA/Small Block transmission.)
* Ram Tough Magnum LA-series V10 (This Engine has a bolt pattern that does not match any other * Chrysler/Dodge, it WILL NOT bolt up to any other transmission other than the iron block V10.)
* 2000–present 5.7/6.1/6.4/6.6 liter Hemi V8

B/RB pattern
* 350/361/383/400 in³ big block B-series V8
* 413/426/440 in³ big block RB-series V8
* 1965-1971 426 in³ Hemi V8

G/RG pattern
* 170/198/225 in³ Slant Six I6
* Chrysler extended block pattern[edit]

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