Re: Identify Y block engine
Yes, thunderbird Cars had the rear draft tube, not side, front. Pass cars with tbird special engine option had front' side crankacase vent.
All said-This has nothing to do with it being a particular displacement
The aspirin dot thing on the crank flange is correct MOST of the time. Otherwise you have to drop the pan and look for numbers on the main caps. Or measure the bore.
As the Rev said they're all 312's!
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