Do I Need a Bushing for the TC for a 273/318 Swap?

pishta said

@yellow rose Perhaps they were forged 273 or 318 poly cranks (2128278 2128869 2205700) balance drilled to 340 specs? PAW used to sell them that way. Is there a stamped number evident on those small register 340 cranks? 68 production year transmissions were also built from june 67 production dates and they all had larger registers for 68 model years. a 1 year only 67 LA 318 would have the small register too, it may even have a forged crank.

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I've never seen a 318 with a small register either. I'd sure like to see one if they exist. Even the 273 in an A100 van didn't have a small register crank. They used a 318 crank in them.....or maybe machine the register to the bigger diameter for use with the 727. Without weighing them, a 273 machined to the bigger diameter and a stock 318 forged look the same. They may have different stampings on them though. Never got that deep into it.