If I remember correctly, the 400 is internally balanced so you have to use the 400 fly wheel. Other SB fly wheels won't work.
 
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'92 GMC Sierra, Sportside, 2wd, 350, Black
'92 Chevy Silverado Extended Cab 4 x 4, Blue
USAFR = 2A674 = Aircraft Fuel Systems Maintenance
i.e. Tank Rat
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