wondering what would be the best way of capping the secondary fuel injector holes? without effecting performance. Would it be best to tap it with plug then grind the plug out inside of the port? or should i just install the fuel rail with injectors and render that rail useless? would this effect performance? I didnt know my manifold had the secondary fuel rail.

 

Just tap it and plug it. Nothing else would be needed.

 

My dad who is an oldschool v8 guy told me to use cold weld. would this be fine.

 

cold weld/JB weld works fine but if you ever wanted to use those secondary injector positions for something like nitrous direct port, it would be better if they were plugs that you could easily remove. It's not in a critical area where it really matters how you seal it up.

 

i went to tap it. The sizing is weird. 1/8npt is too small and 3/8npt is too big. I am gonna have to drill it.

 

sorry to bring this back from the dead but i have the same issue.

would you know what type of factory/oem fuel injector would fit for the secondary bosses?

 

none. it has to be either a bosch or delphi injector