There is an exhaust Air Check Valve that goes from the bottom of the air cleaner to the rear of the right exhaust manifold.
The 440 will be getting a throttle body EFI system.
Is there something to block that port on the exhaust manifold off?
Also, Would I be better off getting exhaust...
We just had the same issue with 906 heads going on a 1978 440.
There is plenty of meat around those holes.
So here is what we did:
Ordered Dorman ST-39 studs.
These are 7/16-14 x 3/8-24. They come 12 in a box. We only needed one, so gave the rest to my builder. $20.00
Dorman-Rockford Catalog...