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Purchased an unknown crankshaft for my 396.
Casting number is 6223..according to documentation I've found online,it's an early 396 crank made from 1053 steel.
The crank has been turned .020 on rods and mains,but not polished.
Does polishing actually accomplish anything?
The surfaces are smooth,but not perfect.
How much power can this early forged crank handle?
Any other info appreciated.
Thanks.
 

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I reground cranks for 6 years,, not sure why they did not polish the crank,,, :dontknow: but it has to be done,, you must have a smooth surface,, can you post some close up pics?? I would mic the journals and check the mains for straightness,, did they radius the ends of the journals and chamfer the oil holes?? Matty man
 

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you should always polish it .cuts down on friction and makes the bearings last longer.being a steel you might consider haveing it cross drilled for full time oiling of the rod bearinge. i do this on all bb cranks and high rpm sb engines
 
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