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Re: 58 Apache Bagged Cummins
an LE8 common in squarebodies made ~360 ft-lbs. stock 6bt makes 400 ft-lbs.
what's also interesting is the GM granny low was in the 6:1 range and the getrag unit in the dodge was around 4:1, effectively giving the 454 more torque output.
my point is, if this gentlemen was asking about a big block conversion nobody would bat an eye on the frame stiffness.
if the 6bt is going to go in stock it be fine. If you're going to turn it up I would look for a period correct 3/4 or 1 ton frame to use or beef up the original one.
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