Engine upgrades, advice please!

[BrockGrimes]

That's an option to, which ever is least expensive.
Hell a drill and tap could be done at home.
Those 2 are good options along with welding, I'd never epoxy them shut.

 

[Ggg]

As much welding it would take, and as susceptible cast iron I6 heads are to warping I would do as GEPR has done and tap and plug the water passages.

 

[BrockGrimes]

Here's good link with info:
Tim Weavers 40 Head Article

They use a copper/brass weld or some shiz.
"Both Hesco and Clifford Performance weld these areas on their 4.0 head conversion kits."

 

[GPER]

That's an option to, which ever is least expensive.
Hell a drill and tap could be done at home.
Those 2 are good options along with welding, I'd never epoxy them shut.

I never liked the epoxy idea either and wanted something that would last a long time( in uses and not mounted on an engine stand for years) It is there when I need it though.