Smog pump holes in the rear of stock heads

[flyingtexan]

Anyone know of a great way to plug these holes in the rear of stock heads? All my smog stuffs gone, just need to plug the holes, or do I?

Thanks

 

[Desperado]

can use a bolt. i melted down old pistons to fill them

 

[harley02]

Ok, here's what I did and it works perfectly. When I took off the air tube where it connects to the back of the heads there are those two blocks. Take a hacksaw and cut those off. Now, take some high temp gasket stuff and flip the blocks over so the flat side plugs the holes. Remember the left side block will now go on the right side and vice versa. Take the bolts and screw them bad boys back in.
I've also heard that the threads on a spark plug are the same so you can screw one in and bust the rest off.

 

[88-GT]

Yea lots of good ways to do it. What I did was take the blocks off the back and hacksaw the lines off, then put a bolt in the open lines and welded around them, works great and no leaks. The putting them on backwards sounds like a great alternative though.

 

[cjman15]

Flipping the pipes works the easiest... that's what i did with mine and have had no problems

 

[racerraj]

I used a bolt, works perfect and it's clean. Long time ago, so I don't remember the bold size. But if a spark plug fits, you could take one to the parts store to check the thread size.

 

[86bluecobra]

i put brass pipe plugs in mine. no leaks. worked great.

 

[$uperstang]

Get thermactor plugs from Summit for like $3

 

[Duro5341]

i put brass pipe plugs in mine. no leaks. worked great.

This works great, put some 1/2" copper caps, and braze them on
no leaks

Duro

 

[retro50]

The thread size is 5/8x11". Any machine shop should sell these thermactor inserts for a couple of bucks.

 

[stang22]

Same size as a spark plug.

Tim

 

[88GT4u2nv]

i know this is a dumbquestion but what if the pump is still in but your using an o/r/h pipe is it now non-functional? if so, would not just having those holes blocked off cause any noticable problems?

 

[shttygtstang]

Anyone know of a great way to plug these holes in the rear of stock heads? All my smog stuffs gone, just need to plug the holes, or do I?

Thanks

easy way take an old plug it fits right in . put it in the hole tighten it down . snap the porsiln off with vise grips. worked for me and 100s others