I did some machine work on the manifolds to position and tap 3/4 NPT holes for the fittings. I got 3/4 NPT to 1" pipe 90 degree elbows from Jegs, 1" thin wall tube from a local supplier and 1" heater noose and clamps from NAPA.

The theory behind the modification is to allow the two manifolds to equalize pressure or vacuume between them easier.



Photos later today.