318 LA Thrust Demensions

1Badcolt said

So using an early model 318
1968 model I can use a 340 steel crank casting # 2532457

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Yes.
You can use a 273 crank, 340 crank , 318...they will all work when balanced/rebalanced.
So the crank and block are pre 74, use pre 74 bearings.