|
Register or Log In To remove these advertisements. |
|
|
|
|||||||
 |
|
|
Thread Tools | Display Modes |
|
|
06-30-2019, 06:57 PM
|
#1 |
|
Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
|
Replacement Exhaust manifold plug size
Truck is a 1968, C20 with the factory 396. Left exhaust manifold cracked so I bought a replacement and installed it. The new manifold has the AIR holes and the large threaded home near the exit point. I have straight pipe plugs in the 4 AIR holes, and that works great.
Any idea what size and thread the hole is near the exhaust exit? Posted via Mobile Device |
|
|
|
06-30-2019, 08:10 PM
|
#2 |
|
Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,783
|
Re: Replacement Exhaust manifold plug size
Do you have a picture? I'm not familiar with anything but the 4 A.I.R. ports and the exhaust port. Maybe it's for an Oxygen sensor?
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
|
|
|
|
06-30-2019, 08:23 PM
|
#3 | |
|
Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
|
Quote:
Posted via Mobile Device |
|
|
|
|
|
06-30-2019, 09:13 PM
|
#4 |
|
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,678
|
Re: Replacement Exhaust manifold plug size
Actually for the smaller tube holes, the size is 5/16'' tubing plug. If you tighten the pipe plugs too much you can crack the manifold. Yeah, big hole is for an O2 sensor. Size as stated---should have had a plug in the box when you purchased it, just like mine did
|
|
|
|
|
06-30-2019, 09:55 PM
|
#5 | |
|
Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
|
Quote:
I didn’t use tapered pipe thread I used straight pipe thread. So it wouldn’t tight and has to use something to lock the threads in place. Posted via Mobile Device |
|
|
|
|
|
06-30-2019, 11:29 PM
|
#6 |
|
Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,783
|
Re: Replacement Exhaust manifold plug size
There are 5/16" plugs that have the same thread as a tubing B-nut, and have the inverted flare on the end to match what is machined into the exhaust manifold. Straight pipe plugs will probably work fine, though I haven't ever done it that way. Looks like you have a universal manifold that fits a ton of years.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
|
|
|
|
06-30-2019, 08:12 PM
|
#7 | |
|
Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
|
Quote:
Looking for the plug that is pictured on the left side of the photo. Posted via Mobile Device |
|
|
|
|
|
07-03-2019, 09:37 AM
|
#8 |
|
Registered User
Join Date: Jan 2004
Location: Whitehorse YK Canada
Posts: 2,651
|
Re: Replacement Exhaust manifold plug size
Found a oxygen sensor plug yesterday and it fits great. One quiet ride again.......
__________________
Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is! |
|
|
|
|
07-03-2019, 09:49 AM
|
#9 |
|
Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,783
|
Re: Replacement Exhaust manifold plug size
Excellent!
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
|
|
|
|
| Bookmarks |
|
|
Hybrid Mode
