The head with the casting number ending with 848 is the best one to use with either block it has the smallest combustion chamber. This was a first for the Chevy and GMC sixes.Īs Kustm52 pointed out, any 235 from 55-62 is a good one, same goes for the 261, which only came with solid lifters. Learned something new myself from '58 on, the 261" had a screw-on oil filter. Also, read the short article about the 261" they have. Someone had just posted a new tip on the Stovebolt page on I.D.ing a 235 or 261 engine by the serial #. The number on the pad behind the distributor is the SERIAL #, not the CASTING # (big diff). Go look for some more info on these engines. Inliners also has an article about the 261" in their Tech Tips, but I had trouble getting that page to come up. Print it and take it with you while you're looking through this stuff. Hey, choptop30, I got your PM, but I'll answer over here.įirst, I was going to send you over to the Inliners site to look at their casting numbers list.
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