The 312 muffler isn't the same. The end that clamps to the engine nipple on a 314 is 90 degrees compared to about 60 degrees for a 312 and the exhaust end has an integral pipe extension that goes through the hood support on a 314 and the exhaust end on a 312 doesn't have that pipe extension rather just perforated where the exhaust gases leave the muffler body. Also the bracket that is welded onto the 314 mufffler for support is different on the 312 muffler...................Gary
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