360 Main Bearing difference

[lemondana]

I've been looking for a set of .020 under main bearings for a 1973 360. A couple places specified 71-73, and 74 up. On Rock Auto, the part numbers are different. Anyone know what the deal is? I looked in the 1973 Parts Manual and they listed up to 1-15-73, and after 1-15-73 with different part numbers. The after 1-15-73 listed as Heavy Duty. Anyone???

 

[Jadaharabi]

The center bearing main cap and block is machined different in the block.
All the other bearings are still the same it's just the center thrust bearing has a bigger flange. Now I believe you can use a small flange bearing in the later blocks. If you want to.

 

[Hellrats]

360 main bearing differences by years?

Post #11 This will help you understand the difference

 

[lemondana]

Thank you! I had seen this described just the other day somewhere. Thanks again!

 

[Hellrats]

You are welcome

 

[Jadaharabi]

Chrysler also changed the 318 thrust bearing size at the same time as the 360.