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Old 02-28-2016, 03:58 PM   #1
71ChevySS(straight6)
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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?
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'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.
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Old 02-28-2016, 04:17 PM   #2
Grumpy old man
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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
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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
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Old 02-28-2016, 04:27 PM   #3
GruntMoanCough
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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.
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