| |
Click on image for the lowdown. 
====
|
| | Forums66 Topics128,052 Posts1,055,727 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
|
| THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
|
| | | Joined: Sep 2016 Posts: 17 New Guy | | New Guy Joined: Sep 2016 Posts: 17 | I have an 84 292 head that has egr ports.I want to eliminate the egr . cannot find plugs for these threads. they seem to be 11/16-18tpi. Next step is to drill and tap to 1/2npt. Is this the right move? | | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | 1/2" is too big- - - -3/8" pipe plugs work very well, and if you use pipe plugs with Allen wrench holes instead of square heads the fix looks a lot better. There's no need to drill- - -just chase the existing threads with a 3/8 NPT tap. Tinker with the threading depth a little until the plugs tighten well just as they get flush with the head casting
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2016 Posts: 17 New Guy | | New Guy Joined: Sep 2016 Posts: 17 | | | | | | Joined: Sep 2016 Posts: 17 New Guy | | New Guy Joined: Sep 2016 Posts: 17 | 3/8 plug falls through the existing threads. there is enough room below the threads to tap for 3/8 pipe to get the plug closer to the exhaust port , which would be better anyway. | | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | Hmmmm- - - -interesting! I haven't encountered that type of head, apparently. Is it the one with the integral intake manifold? If so, have it magnaflux-checked for cracks before you invest a lot of time and money in it. They're notorious for warping and cracking.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | That is the real late style. I have used a flare fitting on those & welded the opening up.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Sep 2016 Posts: 17 New Guy | | New Guy Joined: Sep 2016 Posts: 17 | it doesn't have the integral intake. its a 1984 crate motor, with jasper id on it. I bought it apart , and amazingly its std bore. Thinking of going w/a 4 bbl, and if I need heat for the intake, one of these ports would work well, I suspect. the 3/8 plugs are working well , down closer to the port, too. thanks for the help, Ed | | |
|
|
| |
