312 crankshaft


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By spankymcfairlane - 13 Years Ago
I have a crankshaft that has two dots where a 312 crank normally has one. I have not looked at the main bearing caps to see what is on them. Any help would be appreciated.



Thanks, Spanky
By PF Arcand - 13 Years Ago
From here link to John Mummerts site. There's an engine I.D. list there. However, it's likely a 292.
By speedpro56 - 13 Years Ago
check the two front counter weights and see if their offset or even. If even it should be a 312, if offset then a 292 or 272. Just another way of checking.BigGrin
By Ted - 13 Years Ago
Two dots or multiple dots on the flywheel flange of the crankshaft typically denotes a 292 crankshaft.  What Gary mentions about the front counterweight offsets works also for crankshaft identification.  Let us know if it proves to be otherwise.
By aussiebill - 13 Years Ago
Ted (7/27/2012)
Two dots or multiple dots on the flywheel flange of the crankshaft typically denotes a 292 crankshaft.  What Gary mentions about the front counterweight offsets works also for crankshaft identification.  Let us know if it proves to be otherwise.

Ted, have often noted 2 little pointy dots over the years, would i be right in assuming its not on all 292 cranks and only as a production identifer, as i ,m thinking theres no difference in the cast iron 272/292 cranks ?? other than the steel ones.Smile

By Ted - 13 Years Ago
aussiebill (7/27/2012)
Ted, have often noted 2 little pointy dots over the years, would i be right in assuming its not on all 292 cranks and only as a production identifer, as i ,m thinking theres no difference in the cast iron 272/292 cranks ?? other than the steel ones.Smile
Bill.  You are correct in that 292 cast crankshafts in general are not marked the same at the flywheel flange and many are not marked at all.  The only given is the 5/16” dot on the flywheel flange being a positive identifier for the 312 cranks; but not all 312 cranks have this dot meaning no dot at all can represent either a 292 or 312.  While many 292 crankshafts are identified by having no dot, a single small dot or multiple dots can also represent a 292 shaft.

 

The 272 and 292 cast cranks are essentially indistinguishable from each other.