Air pump feeds from exhaust on block

[Inkncraig]

I need to cap them and wondering who makes the parts and where I can buy them

 

[stangg]

You can use just about anything with a 5/8-11 thread. I had originally used a 5/8-11 "set screw" that eventually backed out. At the momenet I've got a short 5/8-11 hex bolt capping the hole. If your heads are used there's probabaly a lot of carbon built up in the holes that you'll need to clean out before you can screw the cap in. Be sure to use some thread locker to keep them in place.

Edit: Your title says holes on the block... The holes I'm referring too are on the back of the heads... I'm assuming you meant the heads.