The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-28-2016, 03:58 PM   #1
71ChevySS(straight6)
Registered User
 
Join Date: Mar 2013
Location: McPherson, KS
Posts: 96
Exclamation Leaky Header-to-Block Gasket, What's the Best Fix? Chevy 250

Hello again! I finally got my 250 put back in and she runs like a champ, but doesn't want to idle very bad when cold, there's a fairly loud hissing/sucking noise (vacuum leak??) and an extremely definite exhaust leak around the front exhaust port, and possibly the number 4/5 ports as well (I think that bolt hole is stripped... What do I do there?).

What's the best way to seal up those exhaust leaks? I've heard good and bad about Remflex Gaskets, and I also heard someone say JB Weld lol but what do you guys suggest?
__________________
'71 Custom-10 2wd longbed, 250 inline-6, NP 435 four-speed. Medium Bronze Iridescent. Farm truck deluxe.

Rat rod build: 1949 Crosley Station Wagon body on 1993 Dodge D350 chassis, Cadillac 500 powerplant.
71ChevySS(straight6) is offline   Reply With Quote
Old 02-28-2016, 04:17 PM   #2
Grumpy old man
Senior Member
 
Grumpy old man's Avatar
 
Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
Re: Leaky Header-to-Block Gasket, What's the Best Fix? Chevy 250

Well...pull the intake and exhaust manifolds and re tap the threads if there just completely wiped out re drill and install helicoils .


JB weld to seal intake and exhaust leaks ? maybe as a last ditch effort when your stuck o the side of the road .

a little info

http://www.inliners.org/ubbthreads/u...t&Number=44551
__________________

1967 Factory short bed - Old school
'71 - 350 / 4bolt / 487 heads / Edelbrock C3BX
Muncie M-22 4 speed / Hurst Comp plus
Factory 12 bolt posi 3.73 / 255-70-15
Smoothed firewall / Factory cowl induction
Power disc brakes / power steering / 3.5-5" drop
Grumpy old man is offline   Reply With Quote
Old 02-28-2016, 04:27 PM   #3
GruntMoanCough
Registered User
 
GruntMoanCough's Avatar
 
Join Date: May 2009
Location: Pemberton, BC
Posts: 1,075
Re: Leaky Header-to-Block Gasket, What's the Best Fix? Chevy 250

Red (high heat) Silicone works well in place of an exhaust gasket.
__________________
My goal in life is to be as good a person as my dog already thinks I am - Unknown
GruntMoanCough is offline   Reply With Quote
Reply

Bookmarks

Tags
250 6, exhaust, vacuum


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 05:29 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com