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oh... i remember asking now about propane setups. Hey that's cool, wish I'd a had a dad like you to set me up with a labor of love like your truck must be.
crawlfish, on the flexplate thing, there is no difference between the 351M and the 400 flex or flywheel. the dampers are different because of the differences of the energy the damper is absorbing from the two different engines.
I would spend the $$ to balance it- cost about $200 typically. It makes sure everything is right. They typically take the crank, pistons, harmonics and ???
