CB350 : 312 sprocket on type 1 FAT camshaft ???

S

sandman28

Been Around the Block
have fat cam, with matching rockers for my rebuild. Just noticed my cam sprocket has 312 stamped on it. so im gussing its for a later model camshaft?
having a hard time finding a definitive answer on whether I can use this sprocket with my fat cam.
HELP!!
 
the sprocket marked 312 is bolted on to fat camshaft, waiting to finish up.... the 312 sprocket bolted on just fine and appears to seat normally on the camshaft. have a skinny camshaft with 312 stamped rockers. will use that if needed, just curious of the differences in cam sprockets if I dont have the correct one installed for fat camshaft ??
 
unbolted and removed the camshaft, did a test fit on the 312 sprocket vs. 312 camshaft. can clearly see the difference I couldnt see when it was in the cam box, fat cam wiggles a little on the 312 sprocket. guess ill be switching to the skinny cam for the now and maybe put it in the fatty over the winter.
 
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