Determining displacement

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   Assuming you don't have 360 or 401 cast into the side of the block,
or assuming it says 360 but you still think it could have a 401 crank/rods/etc:

If the engine seems within balance now,when you pull the flex plate you should be able to determine if it's a 360 or 401 flex plate.

Then, even if the flexplate seems like it's not stock and has been rebalanced,
you should be able to have a shop match balance the new flywheel to be the same as the old flex plate.

1970 & 71 360's used 390 flywheels,
so, worst case scenario if you started with a 401 flywheel, and found the engine was a 360,
 I suspect you could still match balance it to your 72 360 flex plate.

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jpnjim Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752	Post Options Post Reply Quote jpnjim Report Post Thanks(0) Quote Reply Posted: Oct/19/2018 at 12:57pm
	Assuming you don't have 360 or 401 cast into the side of the block, or assuming it says 360 but you still think it could have a 401 crank/rods/etc: If the engine seems within balance now, when you pull the flex plate you should be able to determine if it's a 360 or 401 flex plate. Then, even if the flexplate seems like it's not stock and has been rebalanced, you should be able to have a shop match balance the new flywheel to be the same as the old flex plate. 1970 & 71 360's used 390 flywheels, so, worst case scenario if you started with a 401 flywheel, and found the engine was a 360, I suspect you could still match balance it to your 72 360 flex plate.
	71 P-code 4spd Javelin/AMX some Jeeps and some Fords