"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.
Best time to do this is before assembly. If you do it after
it's assembled, make sure you keep the shavings out of the block. Rags and
a magnet are needed. I should be using a tap handle at least or better yet
a tap fixture to keep it square and straight.
Passengers side hole is partialy covered by the gasket but
it will leak if not plugged. There is a water passage on the head that almost
lines up with this hole which is why it also needs to be plugged.
Use sealant rated for water contact and high temperature.
Make certain you are below the deck with the installed plugs.
This hole needs to be drilled to the R drill size (.339").
Again use good sealant on it. Pretty simple but don't get in a rush or you
could end up with a leaker or worse yet you could break the tap off in the
block or the head.
Wilcap Company
P.O. Box 763 Pismo Beach CA 93448
(805) 481-7639
FAX (805) 481-9367
EMAIL pmcguire@wilcap.com
NOTE; Please Put "Wilcap" or "Sharp" in subject line of email