| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,176 Posts1,057,058 Members48,460 | | 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!
| | 
#17145 03/23/2004 5:17 PM | Joined: Jan 2002 Posts: 2,843 'Bolter | | 'Bolter Joined: Jan 2002 Posts: 2,843 | This has been discussed recently but here's a shot of my gasket showing the darkened ends where it is leaking as compared to the still shinny silver area towards the center. To me either I have the exhaust manifold machined flat or replace the guide pin with a bolt. http://community.webshots.com/photo/127846177/127846450zvjGex Just trying to tighten things up here and there.
Craig My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.
| | |
#17146 03/23/2004 5:26 PM | Joined: Sep 2003 Posts: 1,820 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 1,820 | I still think that Chevrolet didn't finish the job on exhaust manifolds. The guide pin is great for installing the exhaust manifold, but after everything is in place and snugged up, I think the guide pin should be removed and a bolt put in it's place to tighten the ends of the manifold. This may not be so much the case with a one piece manifold, but especially the case with a two piece set of headers.
"Truckin' Around .......... Since 1937!" My name is Joe and I am addicted to Classic Country Music. I just can't hep myself.Operators are standing by to take your calls! Now cruising in the Passing Lane | | |
#17147 03/23/2004 6:14 PM | Joined: Apr 2000 Posts: 499 'Bolter | | 'Bolter Joined: Apr 2000 Posts: 499 | Did you try to loosen the two end bolts? They may be over tightened. I don't have the torque specs handy. On the 250 and 292 the two outside bolts are 20# and the center bolts are 30#
Tube header flanges are simply too weak to be clamped without replacing the guide pin with a stud. It's real easy to get leaks from over tightening tube headers. At least it is when you replace all the bolts and pins with studs/nuts(w/fine treads).
'67 GMC 3/4 292 4spd
| | |
#17148 03/23/2004 7:37 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | My cure is to take the manifolds off and clean the surfaces. With new gaskets, put a coat of ultra-copper Rtv on both sides. Assemble, tighten, and let sit for 24 hours to cure before starting. Trim off the excess with a knife. Replacing the pin with a bolt does help.
Fred
52 3600
69 C-10
| | |
#17149 03/24/2004 1:13 AM | Joined: Mar 2004 Posts: 37 New Guy | | New Guy Joined: Mar 2004 Posts: 37 | I had a serious exhaust leak with my 235 before I had the head work done, I had napa remove the studs and replace with bolts, it looks alot better I think, and now I hopefully wont ever have to worry about another exhaust leak | | |
#17150 03/24/2004 6:14 PM | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Craig,
I have a NORS exhaust manifold gasket and it is approximately twice as thick as modern replacements. Try two gaskets and use the copper RTV on all sides of the doubled-up gaskets.
This would work with either the original alignment studs or with studs replaced with bolts.
Tim | | |
#17151 03/25/2004 3:53 AM | Joined: May 2003 Posts: 111 Member | | Member Joined: May 2003 Posts: 111 | what the heck. I'll try any cheap answer. My exhaust gasket has never sealed right.
35 + years of rollin' steel!
| | |
|
|
| |
