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miker98038 · 03-07-2015, 07:28 PM

All y blocks with the pan and trans on are 312's. They only become 272-292's when you check the crank or main caps. My 55 bird had the rear intake manifold draft tube, and I'm pretty sure 57's did too. The front canister/short tube was typically pass car. dmsfrr' comments are also correct. Keep posting the info.

03-07-2015, 07:28 PM	#4
miker98038 Senior Member Join Date: Mar 2013 Location: Kent, WA. Tucson, AZ Posts: 1,397	Re: Identify Y block engine All y blocks with the pan and trans on are 312's. They only become 272-292's when you check the crank or main caps. My 55 bird had the rear intake manifold draft tube, and I'm pretty sure 57's did too. The front canister/short tube was typically pass car. dmsfrr' comments are also correct. Keep posting the info.