G-series vs H-series Flat Six BH's

Ross F-1

Ross F-1

Well-known member
Are the bellhousings from G-series flat-6's the same bolt pattern etc. as the H-series flat-6's?
 
Ross
G is part # 6394 41-47 pass, com, truck 6 cyl G
H is part # 6392 47-48 pass 6 cyl H, 47 trucks 6 cyl H
Bruce
 
Thanks Bruce! Do you know if they are physically interchangeable? I know some were steel, some cast iron, which could mean a different P/N but they could still interchange.
 
I don't know about passenger cars, but truck transmissions use the 78- series case for trucks '42 - '50/51 with both G and H sixes. After that they used the similar side-shifter case for column shift. So, I would say they are the same as far as matching the transmission, but don't know about the engine side. Hope this helps!
 
A member of the truck forum is swapping out one flat 6 for another, and the BH doesn't appear to align with the new engine's rear face holes. It's a cast iron BH, which would be Truck. It has the two lowest holes for the large bolts (at about centerline) tapped, meaning the bolts come from the front. Only two of the upper holes align with holes in the block. The old engine is gone, so we can't tell if it was a G series engine.

There's no issue on the BH-to-trans side, he's keeping the trans that was hooked up to the old engine and BH. (And it's a truck trans).
 
Ross, The photo he posted of the old engine has the distributor on the side, so I believe that would be an H. Apparently the G sixes had their own transmission case, as the half bell on the transmission was a different shape. It has a bump sticking out of the side of the bell to cover the starter drive.
Mark
 
The G series engines used a bell housing and transmission case specific to those engines. However, the G series had a removable bell housing. The G bell housing assembly can be installed on a later H or M series engine block and the later engine bolted to a G series transmission. 25 years ago dad had a 46 sedan with an H series engine bolted to a G series transmission using all factory parts.
 
If I remember correctly, the H series six cylinder engines had a plate that bolts to the engine and the clutch housing bolts to the plate. The G series had a full clutch housing that attached to the engine. The fit there is likely the difference. The transmissions didn't change much in the years from 1932 up through 1950. In 51, the gears changed in all the Ford 259 series transmissions to what was referred to as the diamond shaped gear tooth. For pickups, the top shift was used for one more year period which was changed over in 1952 at some point.
 
552435


552436


1942 Ford Six Cylinder Engine and Gear Box.
 
Had to take all my G transmission internals and put them in a v8 case . Putting an H into a 1946 coupe
 

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