Dibbons
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The aftermarket side hood bumpers do not match factory equipment.
The bottom crank is forged for sure and the top one looks like a cast crank. The forged cranks have a wide parting line like what's on the counterweight....same on the 'face' of the journal. Cast cranks have a thin parting line.Update: The 340 (.040" overbore) I purchased evidently came with a 273/318 forged crankshaft (ground .020" undersize) being the fact there are no holes drilled through the connecting rod journals (see photo for comparison). I purchased a 340 crankshaft (ground .010" undersize) to replace it to avoid any balance issues. I have no idea how the engine would have run with the previous owner using the other 273 crankshaft.
Now I need to have a machine shop inspect the 340 crankshaft to find if it needs a regrind or only a polish. I believe the bearing set I already purchased is for a .020" undersize re-build.
When struck with a metal object, both crankshafts give a very similar "ping" sound. The 273 crankshaft is obviously forged and I am not sure yet whether the 340 crankshaft is forged or cast.
View attachment 1720838
I know what you mean, but I am still not positive about the 340 crank. It has signs of a wide parting line in places.The bottom crank is forged for sure and the top one looks like a cast crank. The forged cranks have a wide parting line like what's on the counterweight....same on the 'face' of the journal. Cast cranks have a thin parting line.