For 20 years I thought I had a 1961 283 but now I'm thinking it's a 62-67 327. On the front pad I think it reads 1T215D and on the rear near the distributor it reads 3789817. The only D code I can find is for 61 283 but it seams that 3789817 is a 327. Can anyone help identify the Cubic Inch and year?
I checked the usual suspects on the web and discovered block casting number 3789817 comes back to:
62-64.……283.……………2 Bolt mains
62 - 64…..327…250 hp…..2-Bolt mains…Truck/Pass
What you have is a 283 block that has very thick cylinder walls that can be bored out to four inch bore 327. This is because the 327 was not introduced to the public until the 1962 production year. Your motor is unusual in this regard as it can be whatever you want it to be. It is a two bolt block because Chevrolet didn't introduce a four bolt main block until 1965 with the BBC (the SBC didn't get a four bolt production block until 1967 when they switched over to large journal blocks with the Z/28 302, and 350 in the Camaro).