Olds 7A Head Question

[SSDiv6]

Originally Posted by Jeff Stout

Im finding 7A heads for my car but have different part numbers. All the specs are the same. My question is do I have to run the part number for the 87/88 car or can I run the 7A head from 85 to 90?

Jeff,

There are two 7A castings:

1972 Olds 350, P/N 409147, and 1985 through 1990 Olds 307, P/N 0142.

The difference between them is obvious because the Olds 350 has larger valves, a smaller combustion chamber, and larger ports, does not have the receded center exhaust port and the rocker arm pad is different.