318- Intake plug question

[enforcer505]

Hi Guys!

I have rebuilt my engine and noticed these two plugs were removed by the previous owner. Does anyone know the size of these plugs? I was thinking of just closing them up.

Any thoughts? (the pic isnt mine but it shows the same holes I have)

 

[Chryco Psycho]

pipe thread so maybe 1/4 & 3/8 or 3/8 & !/2
sorry not much help ...

 

[challenger6pak]

Close them up. I believe it is 3/4 pipe thread. They are part of the early EGR system. They let exhaust back into the intake.

 

[enforcer505]

i see one is 3/4 and notice the right side is just a hole... no threads. how would you recommend to remove it?

 

[Rapidfire]

Just run the appropriate size pipe thread tap in and put a plug like the other side. That's what I did on my stock big block manifold.

 

[enforcer505]

makes sense! I will try that!

 

[enforcer505]

I dont think these holes go anywhere anyways because the egr is plugged off.