Need to replace the flywheel on my 70 NOva 4 speed. Does anyone have the GM part number for a Externally Balanced, 168 tooth flywheel for a 454 ?

454 external balance flywheel, PN 3993827, and casting # 3993457.

pdq67

Thank you very much

There are different 454 flywheels depending on what year your 454 block is. There is the 1970-1990 blocks and the 1991+ blocks. They use different flywheels. make sure you get the correct one.

There are different 454 flywheels depending on what year your 454 block is. There is the 1970-1990 blocks and the 1991+ blocks. They use different flywheels. make sure you get the correct one.

I am not sure what year it is from. Is the year stamped somewhere on the block if its one of the 1991 + blocks ?

One piece main seal? or Two piece?

Take a look at this. http://www.northernautoparts.com/ProductModelDetail.cfm?ProductModelId=16404

Much cheaper than buying used and having it resurfaced and/or new ring gear installed. Don't think shipping was all that bad from these guys either. I have bought several items from them with no complaints at all. Good luck!

Right.

Sorry, I posted back for a Mark IV block like I have is all!

pdq67

454 external balance flywheel, PN 3993827, and casting # 3993457.

pdq67

I need a flywheel for the 1970 to 1990 two piece rear main seal. Is the one you mention here the right one ?
Many thanks again for the help

The one in my link is for a two piece seal and external balance. Is a replacement for the GM flywheel you need.

Yes, it's for a 454 2-piece seal crank.

pdq67