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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2010 Posts: 17 'Bolter | | 'Bolter Joined: May 2010 Posts: 17 | I am building a 54 chevy half ton pickup. I am building up a gmc 302 for it and want to use the original 235 chev. bell housing. I am told that I need a flywheel from a gmc 270 or 248. Is this correct and does anyone know where to get one or have the casting no. for one Thanks. | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Partially correct.
Is your truck going to be 6 volts or 12? That makes a difference for the flywheel. The 302 has a 6 bolt flange. Only 1955 and possibly 1954 248 flywheels are 6 bolt 6 volt. The later 1956-1959 270 flywheels are 6 bolt 12 volts.
Look up James Larowe. I'm sure he has the flywheel you need. | | | | | Joined: May 2010 Posts: 17 'Bolter | | 'Bolter Joined: May 2010 Posts: 17 | my truck was a 12volt. So I guess I need the newer one. Thanks | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Your truck may have come to you as a 12V but it came from the factory as a 6V. It's possible you still have a 6V starter. Count the teeth on your current flywheel. If it's 139 then you have a 6V starter. You'll need a 6V GMC flywheel to use it. | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Or you might have to pony up for a 12 volt starter. Cletis is correct, you don't want to mix 6 volt starters with 12 volt flywheels. | | |
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