340dartswinger
Well-Known Member
I am having trouble sealing my Headman header gaskets. I have tried 3 different gasket sets and i am still getting a leak. Any suggestions?
Headman Header Gaskets
- Thread starter 340dartswinger
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68gts340
Well-Known Member
are the headers new or used? used headers tend to have bent flanges, right at the bolt hole, if that is the case try to straighten them, i have doubled up gaskets before also , but they dont last to long that way. ..some one else here may be able to recommened a better gasket too....
cudachaser
Well-Known Member
I used 2 Mr Gasket thick cardboard type gaskets on each side and it did the trick. Peace
dgc333
Well-Known Member
I am using two per side of Fel-Pro composite header gaskets with some hi-temp RTV. 4k+ miles so far with no leaks.
I tried a bunch of different gaskets including the solid copper ones but always had a leak between the ceneter two tubes. The Fel-Pro's a relatively thick with a metal reinforcing core.
I tried a bunch of different gaskets including the solid copper ones but always had a leak between the ceneter two tubes. The Fel-Pro's a relatively thick with a metal reinforcing core.
Don't know what gaskets are best, but I try to do on all my header bolt's, is to use the biggest diameter "hardend" washer you can get on each bolt and tighten the good. The ole saying "not with out a washer". Washers spread the load out, just like on valve covers. Try that.
Dave C.
Dave C.
mikedevore
Well-Known Member
what type of engine & brand of heads?
340dartswinger
Well-Known Member
i have a 340 engine with J Heads...i am also running used headers so the flanges might be bent...thanks guys!
Just a thought. Here's what I've done for years, with good results. And I presently running Heddman W2 gasgets.
1. I'v always cut the flanges between the front, centre and rear ports to just 1/16" left to allow flex.
2. And this is a must for me. I use studs almost entirely, instead of those small-headed cap screws that all manufacturers give. Studs, with never-sieze, will always give a higher torque value than the screws. Yes. They are a pain, but it minimizes the leakes for me.
1. I'v always cut the flanges between the front, centre and rear ports to just 1/16" left to allow flex.
2. And this is a must for me. I use studs almost entirely, instead of those small-headed cap screws that all manufacturers give. Studs, with never-sieze, will always give a higher torque value than the screws. Yes. They are a pain, but it minimizes the leakes for me.
64dartwagon
Walking in Circles
With my early hookers I have to run the small port gaskets as the others are just a little to wide and don't seal. I don't know if the later hookers go with the wider set. The early Hookers are setup for the smallport 273.
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