[rcross55]

i have an engine with the casting number of 3959532, there are two lines of numbers stamped on the pad in front of the r/h head that read CE6N251 and under that number is the So824XO number any idea on how to decipher would be appreciated

[1ownerT]

The CE designates it as a crate engine.

[68NovaSS]

Originally Posted by 1ownerT

The CE designates it as a crate engine.

Armed with that, take a look at this site.

[rcross55]

i have looked at the site and sort of confused:the casting number says it is a 69 283 block but the numbers on the landing indicate it is a ce crate engine the next number being a 4 i am assuming it is a 74 since ce was not used till 1968 now the rset of the number says it is a saginaw built engine in aug and that it is a 350 truck engine. Do they use the 283 block to build 350 truck crate engines?that i guess is the question

[1ownerT]

That code is a 1956-67 283 number. A 283 would take a .125 overbore to make a 350, not impossible but not doable on all 283's, the main bearing size of a 283 is smaller than a 350 also.

[cobalt327]

Originally Posted by rcross55

i have an engine with the casting number of 3959532, there are two lines of numbers stamped on the pad in front of the r/h head that read CE6N251 and under that number is the So824XO number any idea on how to decipher would be appreciated

To add fuel to the fire, the suffix "XO" shows a 1969 350 cid truck engine, 255 hp, RPO LS-9 w/a TH400 trans, 4-Bbl and 4-WD.

You might need to check the bore and stroke.