340 Vs 360

I never had luck with a 360. I scattered many LA's 318's , 340's, and 360's. I put 340 top ends. on 318's and 360's. I would constantly take them to the limit with no regard whether they would live or die.

Its not the power they make its the strength they have compared to one another. I had 318's, and 360's. That ran better then 340's. But The 340's always withstood more abuse. I always assumed it was the steel crank . The 360's would always seem to break rods. I don't believe the rod was the problem nor the pressed pin. It always pointed to cylinder wall failure on the 360's I used.

I did have one 360 that was indestructible. That was from a 71 Fury. The rest I used were from later ramchargers and trucks. I believe "block flex" would cause cylinder wall failure and bind the piston causing the rod to break.

Mopar narrowed the left mount ears on the 340 which continued on the 360 on LA motors. I believe to take stress off of the thin area of the block.This was discontinued on magnums and resto 340 replacement block. Also the X Block? Was actually a 318 and used the 318 mount

So this said my opinion is the 360 LA block is great if you fill it half way with hard block or use motor plates. In A mild street car running,( HO slot car tires) this is not needed. Use what is cheapest and hammer it. No loss! Why have them live longer then us ?