[steve25]

Tim do it right but to do that you need to pull the head(s), that’s the hardest part.

Next drill the hole with a new 1/2”
Drill bit.
Get some 1/2” OD brass tubing from a hobby shop or order it from Grainger or micro mark.

Cut it to length full coat both the hole and tubing with JB weld and install it.
Let it harden for a full day and then cartridge roll sand away what you don’t need.

Sorry for your issue, but atleast you did not harm anything in a new motor.

Here in this photo of a max ported D port 16 head you can see how I did it.

[johnta1]

If there is no rag or vacuum leak in that port on the intake, probably need more info. Hard to do this stuff over the internet.

Glad you found the problem. As said, without all the info on your engine, it's hard to determine the cause.
(nothing about head work being done)

[Tim Corcoran]

Originally Posted by steve25

Tim do it right but to do that you need to pull the head(s), that’s the hardest part.

Next drill the hole with a new 1/2”
Drill bit.
Get some 1/2” OD brass tubing from a hobby shop or order it from Grainger or micro mark.

Cut it to length full coat both the hole and tubing with JB weld and install it.
Let it harden for a full day and then cartridge roll sand away what you don’t need.

Sorry for your issue, but at least you did not harm anything in a new motor.

Here in this photo of a max ported D port 16 head you can see how I did it.

Steve
Thanks for the great info on how to fix this. Fortunately, only one head will need to come off the other head is OK. Can this be drilled by hand or will it need to be done in a mill? I have a drill press but getting the head at the proper angle would be almost impossible.

[Gach]

Hand drilling would be tough, have to go slow and easy. But it could be done.