lead69
hopeless car junkie
I get it but this has been discovered before. I don't remember where but when we encountered this we searched and found discussions on this with the same results (including this forum iirc). The ones we dealt with were unturned factory 340 cranks that were early 67 with small registers. The assumption is the factory must have carried over the 273/318 cranks small register for a limited number of early 67 built 68 340s. It was chrysler lol, look at the stuff they have done.
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I can only go by my own experience until I see proof of something different. A "carry over" from a 273 or 318 doesn't make any sense to me as the 340 used a total different billet. Same bearing specs, sure, but, weight and design is different...and with different forging marks to go with it. I'm assuming you're talking about calendar year when you say early '67, as there were no 340's in a '67 model year. And there again, I've never seen a 318 crank with a small register either, so, what are they carrying over? I owned a Mopar wrecking yard for 32 years, tore down hundreds of small blocks, and the only crank I ever saw with the small register (not counting the slant 6) was the '64-7 273 crank. I'm not saying that it's impossible some weren't made, but, show me one with good photos and some forging marks, or a Chrysler tech bulletin, and I'll happily acknowledge it as a true factory item. A genuine 340 crank will have a hole through the first and last rod journal. Solid journals are 273 or 318.
