Thread: 454 flywheel size question

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Pat, Not sure I follow... What you are saying is that I should stick with only 454 flywheels...? Any other chevy flywheel (though it may fit) should not be used...?

When you mention the mark 4 and 5 454, I am confused..

The flexplate on a 400 sbc and the flywheel from a 454 bbc are externally balanced. To my knowledge eveything else in Chevy's inventory is internally balanced.

Originally Posted by Gusaroo

Pat, Not sure I follow... What you are saying is that I should stick with only 454 flywheels...? Any other chevy flywheel (though it may fit) should not be used...?

When you mention the mark 4 and 5 454, I am confused..

mark 4 is on it own 4 is the only one for a 454 that will work and mark 5-6 are not the same as a mark 4. i would not use one of them cheap plates .they all will bolt up but just not bal to your engine the mark 5-6 one pice rear seal so they have no counter hub for add weight gm makes a#3963537 for a 1970-90 outside dia 12.3/4 and #3993827 fro 1970-90.11 clutch outside dia 14. ,gen5-6 #1409687 454/502 11clutch and nodular iron #14096805 the weight i am talking about is the counter or bob weight on the wheel not the same on a 454 from 1970-90 to mark 5-6