64-66 manifold questions

[jcab]

there was only one casting number for these manifolds, which were:
1739599 (right)
2465857 (left)
correct?

secondly, do these manifolds fit all small blocks, or just the 273?

I have only ever worked on a 318, so I know nothing about the other small blocks.

thanks

 

[HawaiiDuster]

I'm not sure about the exhaust, but the intake on a 64-65 273 use 5/16" bolts that go in at a different angle from the 66 and up.

 

[AdamR]

They should fit 273and 318s but the ports will be to small for 340-360 heads.