The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Leaky Header-to-Block Gasket, What's the Best Fix? Chevy 250

71ChevySS(straight6) · 02-28-2016, 03:58 PM

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?

02-28-2016, 03:58 PM	#1
71ChevySS(straight6) Registered User Join Date: Mar 2013 Location: McPherson, KS Posts: 96	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.