1980 olds had 307 and 350 put in

[oldolds]

are the vacuum lines the same? I think the engines are the same year but I have noticed extra vacuum port on the intake and the intake says olds on it but it is aluminum.

 

[oldolds]

are the vacuum lines the same? I think the engines are the same year but I have noticed extra vacuum port on the intake and the intake says olds on it but it is aluminum.

i got the number off the intake if that would help it is 2252621 does this help?

 

[MrSony]

Is it an olds 350 you're putting in?

 

[oldolds]

not sure that's what I was told. how do I find out. the guy who installed it passed a while ago.

 

[fleming442]

There are numbers cast into the flat behind the water pump, next to the oil fill tube, that will tell you what the block is. A large 2 to the right of the smaller numbers denotes a 350 whereas a large 4 or 4A is a 403 according to Bill Travato's book.

 

[olds307 and 403]

The 1977 and later blocks also have displacent in big numbers on the side.

 

[oldolds]

The 1977 and later blocks also have displacent in big numbers on the side.

i will clean off that area and see,how can i tell what year?

 

[olds307 and 403]

They used 7/16" head bolts on 76 and older and 1/2" bolts on 77 and newer. An A or B in casting number behind the water pump below the oil fill tube is dead giveaway to a 77 and later block, along with the displacement cast in the side of the block in big numbers.