Part number help

[Jerry G.]

I've been digging through my old storage site and came accross a couple of small block heads that have part numbers I don't recognize. The first is 3837064 casting date H 76. The second one is 3884520 casting date I 24 5. Any of you number gurus recognize these? jerry

[Joe L.]

Re: Part number help

Jerry----

GM casting #3837064 was used only for 1956 passenger cars with 265 cid engines. It has 1.72" intake and 1.50" exhaust valves. Chamber size is 67.5 cc, nominal. It was GM PART #3729786.

GM #3884520 was used for 1966-67 Chevrolet passenger, Chevelle, and Chevy II with 195hp (2 BBL) and 220hp (4 BBL) 283 cid engines. It also uses 1.72" and 1.50" valves, but has a chamber size of 60.5 cc, nominal.