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Author Topic:   sb 400 questions/ help this dummy
neil rucker
Member
posted October 18, 2004 10:03 PM
do you have to use a diffirent flywheel and dampener on a 400? why? what if you have the assy. balanced? (just like you would a 350 or anything else, with the crank, rods, and pistons) do you need the dampener and flywheel you plan to use when you balance it or can you run any flywheel and dampener? why? shoudn't you also have the clutch asy. too? thanks in advance, neil


chomme
Member
posted October 19, 2004 05:43 AM
Like Chomme said, they are externally balanced. But, if you're going with internally balanced components, or if you're going to balance the stock components, then I would think you could eliminate offset balancer and flexplate. You can then run the 350 stuff and everything should balance out.


19J
Member
posted October 19, 2004 08:33 AM
I would go with all internal balanced rotating assy, the 400 external balance stuff is junk pretty much. That external balancing piece that bolts on the flywheel / flexplate is scary looking in and of itself.

Also as others said make sure all your pulleys, couplers and flywheel are balanced to neutral. We just had a short-block balanced and he wanted everything that bolted onto the engine there to balance it as an assembly, just to be sure nothing was out when it was all assembled, including hardware.

neil rucker
Member
posted October 21, 2004 05:21 PM
thanks guys


chomme
Member
posted October 21, 2004 09:45 PM
On a funny note though...I sold a motor I had for a spare to a guy this past year. It was a balanced/blueprinted 406. 2 bolt mains, 10/10 stock gm crank, 5.7" polished rods (did myself) and put ARP bolts in them...and KB domed pistons. All decked and such, he ran it over 35 nights, took the track championship, and won over 16 mains with the motor. The first two nights, he missed gearing and was buzzing 7300rpm's. Then he re-geared and turned it about 6400 the rest of the season...so if properly done, it can work and be successful.