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SEALING HEADERS TO HEAD

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Sep/11/2020 at 6:08pm
Headers on a plow truck???
Headers only provide more HP at the top end of the RPM range (they do provide a little gain in the middle but not much, 1 to 5 HP). Unless your doing the 1/8 or 1/4 mile pass on each plow run your not gaining anything with headers.
Some manifolds and new pipe to the mufflers would be the long term solution. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PROSTOCKTOM Quote  Post ReplyReply Direct Link To This Post Posted: Sep/11/2020 at 6:51pm
Originally posted by Trader Trader wrote:

Headers on a plow truck???
Headers only provide more HP at the top end of the RPM range (they do provide a little gain in the middle but not much, 1 to 5 HP). Unless your doing the 1/8 or 1/4 mile pass on each plow run your not gaining anything with headers.
Some manifolds and new pipe to the mufflers would be the long term solution. 
With the exception on vehicles like a plow truck or something that doesn't move very fast yet has a serious load on the engine having headers will make the engine run cooler.

Tom
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Greyhounds_AMX Quote  Post ReplyReply Direct Link To This Post Posted: Sep/11/2020 at 8:06pm
Which Remflex part number are you using? I ask because they offer one with more coverage to help with crummy header flanges.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Greyhounds_AMX Quote  Post ReplyReply Direct Link To This Post Posted: Sep/12/2020 at 8:28am
PN 1001 -- AMC (Jeep), 304 ('70-'79), 360 ('70-'93), 390 ('70), 401 ('71-'76), 2/Set




PN 1003 -- AMC (Jeep), 304 ('70-'79), 360 ('70-'93), 390 ('70), 401('71-'76) "Weld Bead" Header, 2/Set




Edited by Greyhounds_AMX - Sep/12/2020 at 8:32am
1968 AMX 390 w/T5
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Sep/12/2020 at 11:19am
It's a plow truck which indicates to me air temperature is colder. You normally don't have to worry about a plow truck engine overheating unless there is something wrong with the cooling system.

Here, depending were you are and outside temperature, they don't turn them off so they stay warm.

Agree, if the truck is being use in the summer months for heavy work, headers would help keep the engine cooler.
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Post Options Post Options   Thanks (2) Thanks(2)   Quote Have2SC's Quote  Post ReplyReply Direct Link To This Post Posted: Sep/13/2020 at 10:06am
  Who cares if its got headers on a plow truck?? I would run open headers and wake up the neighbors!!   Find some stock exhaust manifold gaskets and double them up and your problems should be solved.  done it more than once and a easy fix!!  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 70series70 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2021 at 9:29am
My headers that i have had for close to 30 years had the same problem, the tops of the exhaust outlets were almost visible over the flange. About 1/16” overlap. Always had leaks along the tops. Blackjack headers, I believe. I finally figured it out & got a welder to add 1/4” to the top of the flanges. Remflex gaskets.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote motorhead_1 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/22/2021 at 7:49am
i bet part of the problem is vibrating loose.
use nord lock washers
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BrotherBamc Quote  Post ReplyReply Direct Link To This Post Posted: Apr/22/2021 at 5:42pm
Originally posted by Lenni AMC Lenni AMC wrote:

Remflex gaskets have worked better for me than any silicon

I agree with this statement 100%... 
The only thing that I didn't care for is sometimes the gasket will stick to either the header or the side of the head and once they tear, they're kind of expensive to replace. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Apr/22/2021 at 6:23pm
Has anybody tried and/or had success with copper gaskets?

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