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Remflex.com
They seal issues like that.
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Remflex.com
They seal issues like that.
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99% of exhaust leaks from headers does not come from poor gaskets.
Warped flanges that do not lay flat against the head are #1. The simplest solution is to split the flanges between each cylinder. That way you pull down one cylinder at a time with no interference from adjacent tubes. As long as each tube's weld is flat it will seal fine.tubes with surfaces not parallel to the others are the cause of leaks
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Roadhazard's header gaskets are very nice, now I need to talk him into making them for 360-1s
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Didn`t know he made those............they will be my next choice since his valve cover gaskets rock.........
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99% of exhaust leaks from headers does not come from poor gaskets.
Warped flanges that do not lay flat against the head are #1. The simplest solution is to split the flanges between each cylinder. That way you pull down one cylinder at a time with no interference from adjacent tubes. As long as each tube's weld is flat it will seal fine.tubes with surfaces not parallel to the others are the cause of leaks
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Metal expands when heated.. we all know this... so
give it the room to expand and dont let it warp the
flanges... if you give each tube a slip area it will
slip instead of warping.. by that I mean drill one
of the mounting holes larger(per tube).. if you have
3 holes per tube drill out 2 of the holes to slide..
you keep 1 hole to locate the tubes..I like
a gragfoil (graphite on stainless material) to let
it slide easy... cut each flange from each other
(ends are cut from the center tubes)... all it takes
for a leak is just a small amount of compression loss
at the flange to get it started and it progressively
gets worse with each heat cycle... cheapo (thin) flanges
make it much easier to warp... thats why I use 3/8"
flanges on all the headers I build
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Metal expands when heated.. we all know this... so
give it the room to expand and dont let it warp the
flanges... if you give each tube a slip area it will
slip instead of warping.. by that I mean drill one
of the mounting holes larger(per tube).. if you have
3 holes per tube drill out 2 of the holes to slide..
you keep 1 hole to locate the tubes..I like
a gragfoil (graphite on stainless material) to let
it slide easy... cut each flange from each other
(ends are cut from the center tubes)... all it takes
for a leak is just a small amount of compression loss
at the flange to get it started and it progressively
gets worse with each heat cycle... cheapo (thin) flanges
make it much easier to warp... thats why I use 3/8"
flanges on all the headers I build
Heat wasn't an issue this time as it leaked from frist fire up. These are pretty thick, they are Hooker Supercomps. They are 2 piece and 1-3 flange is cut and 7 is t he slip-fit tube. But I'll try and drill one hole a tad bigger on the 3 side of the header.
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99% of exhaust leaks from headers does not come from poor gaskets.
Warped flanges that do not lay flat against the head are #1. The simplest solution is to split the flanges between each cylinder. That way you pull down one cylinder at a time with no interference from adjacent tubes. As long as each tube's weld is flat it will seal fine.tubes with surfaces not parallel to the others are the cause of leaks
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I`ve tried those gimic metal gaskets and unless the flanges are perfectly flat they leak. I use the blue Fel-pros w/grease and they never leak.
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I`ve tried those gimic metal gaskets and unless the flanges are perfectly flat they leak. I use the blue Fel-pros w/grease and they never leak.
Same here.
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99% of exhaust leaks from headers does not come from poor gaskets.
Warped flanges that do not lay flat against the head are #1. The simplest solution is to split the flanges between each cylinder. That way you pull down one cylinder at a time with no interference from adjacent tubes. As long as each tube's weld is flat it will seal fine.tubes with surfaces not parallel to the others are the cause of leaks
these are cut... don't see how you can cut between 3/5 thou (were the leak is).
Roadhaz... I don't mind the $43 for the Rem's I just don't want to put off what might need to be done anyway. The 1st set of Fel-pro 1414's lasted a good 100+ miles and were fine until the 5 run of the night when I noticed a slight leak, 2nd round of elims blew it all the way out. The percy's leaked at 1st start up. FWIW they seem to be blowing out at the top on 3/5...pass side still has the original Fel-pro 1414's.
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Sorry to hear that Yuck....I've had great results with the Percy's gaskets. Been using the same set on 2 different motors for 6 years.
If the welded up exhaust is preventing the flange from sitting flush against the head....I would think that could be a problem. I would disconnect the head pipe and because it sounds like the flange isn't sitting perfectly flush with the head surface.
Ron
