340 Crank question?

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Scubakuda19

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Anybody have any ideas what these grooves are from in pic 2? Is it a way of removing weight for balancing? Any and all input appreciated.

Its def not a forged crank

I'm trying to decide to what extent I want to go on this engine, and we all know were that leads. Stay safe!!

15872383820593021810154455782638.jpg


15872384095459073198897877299030.jpg
 
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Holes drilled in the counterweights were used for the "rough" factory balancing. I've seen them som some and not others. I would bet that those "grooves" are likely just marks from the forging /machining process.
 
pic 1 shows a block cap cast 1 12 1971, and a crank with a , more pics would help, casting number ?83588? - not forged
 
Locomotion said:
Holes drilled in the counterweights were used for the "rough" factory balancing. I've seen them som some and not others. I would bet that those "grooves" are likely just marks from the forging /machining process.
Click to expand...


This^^^^^ It’s tooling marks after they faced off the counter weight.
 
cast crank. not forged steel. get some light pistons and internally balance the assembly
 
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Good eye on the cast crank. But THAT early? Did they have a cast date? Dated bearings, VIN on the block or any other clues? It is almost 50 years old, but...?????
 
it is a 71 block, definitely not a 71 crank. cast 340 crank 1st year was 72, casting number can be looked up, and look for a raised cast date on crank
 
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