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Old 01-08-2015, 02:33 PM   #1
Ross F-1
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Default G-series vs H-series Flat Six BH's

Are the bellhousings from G-series flat-6's the same bolt pattern etc. as the H-series flat-6's?
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Old 01-08-2015, 02:49 PM   #2
cmbrucew
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Default Re: G-series vs H-series Flat Six BH'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
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Old 01-08-2015, 03:12 PM   #3
Ross F-1
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Default Re: G-series vs H-series Flat Six BH's

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.
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Old 01-08-2015, 07:06 PM   #4
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Default Re: G-series vs H-series Flat Six BH's

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!
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Old 01-08-2015, 08:24 PM   #5
Ross F-1
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Default Re: G-series vs H-series Flat Six BH's

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).
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Old 01-08-2015, 09:40 PM   #6
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Default Re: G-series vs H-series Flat Six BH's

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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.
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