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Late 400 Main Bearings #2950124 08/03/21 07:11 PM 08/03/21 07:11 PM
Joined: Nov 2012 Posts: 53 T Torq37 OP member
Torq37 OP member T Joined: Nov 2012 Posts: 53	I thought all low block engines used the same main bearings until I started looking at new old stock bearings. Looks like 1974 and later 400 engines used a different main bearing set. Is this due to a difference in the block or crank or both?

Re: Late 400 Main Bearings [Re: Torq37] #2950139 08/03/21 07:48 PM 08/03/21 07:48 PM
Joined: Dec 2012 Posts: 257 Alberta 4 440_Offroader enthusiast
440_Offroader enthusiast 4 Joined: Dec 2012 Posts: 257 Alberta	74 and later had a larger thrust bearing surface. I think you can use the older bearings in the newer blocks, but not vice versa. Both the block and crank would be different in the thrust area. Perhaps someone here, will know for sure.

Re: Late 400 Main Bearings [Re: 440_Offroader] #2950164 08/03/21 08:34 PM 08/03/21 08:34 PM
Joined: Mar 2011 Posts: 3,075 Michigan A A727Tflite master
A727Tflite master A Joined: Mar 2011 Posts: 3,075 Michigan	Originally Posted by 440_Offroader 74 and later had a larger thrust bearing surface. I think you can use the older bearings in the newer blocks, but not vice versa. Both the block and crank would be different in the thrust area. Perhaps someone here, will know for sure. You are correct about interchangeability. The later block has a larger relief cut for the larger radius bearing. The crank has a larger surface are for the thrust.

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