Engine cast # help

[jonocala]

I have been given a motor(Buick I believe) with casting # 1241765 on the block, B1238094-1 on RH Ex Manifold and B-1247331-1 on the intake.
It also has a Rochester 4BBL. I found reference of Ex Manifold saying it was a '67 Buick 400/430 but can't find the engine block # 1241765 info I need (I found a 1241735 but not 765).
Can someone help me ID this motor? Thanks Jon

[bob k. mando]

if you pull a head, the bore would instantly tell you.

400 = 4.040"
430 = 4.1875"
455 = 4.3125"



with casting # 1241765 on the block


if it's a big block, the displacement should be cast into the saddle right next to the casting number:
http://www.teambuick.com/forums/view...t_engine_where



also useful, if you can find it, would be the two letter Engine Code.
http://www.teambuick.com/forums/view...t_engine_63-75

[jonocala]

Thanks,
It does have 455 cast on the saddle also above the 1241765. I will see if I can find any other numbers that might tell me the date codes or year.
There is a "GM" casting to the left of the engine cast # running up and a big "5" to the right of the cast #'s running down.
Jon