[Ki_Power]

What is up with this?

The Chevelle I bought a few months ago had an exhaust leak...so I pulled the headers (Figured I re-paint them too...and they look much better)...and I see the exhaust ports on the heads are [] and the flange ports on the aftermarlet headers are O.

Anyone ever run into this?

My guess is that it is wrong and the headers are the wrong ones.

I have to get this buttoned up and drive-able again at least for now, until I can buy the RIGHT headers...any ideas?

 

[bigmachd]

Liam, I have ran into this alot,especialy "back in the day" get a good copper gasket and it should be fine. Make sure it will seal on exhaust port and header before you put it on. Of course the best solution is to get headers that fit. Hope this helps.:yes:

Mac

 

[marks412]

Measure the exhaust port from corner to corner. Measure the header inside diamiter. If the mesurements are the same, you should be fine.

If this is the case, you could open up the exhaust port on the roof and side, to make a D port. Leave the floor alone.

 

[Green-cars-live-forever]

My hedmans are like that. I've used Spectre round port gaskets from pep boys and hedmans gaskets. Tried a couple of squarish felpros that were a no go.

 

[10secBu]

replace the gaskets and forget about it. Not worth messing with IMO.

 

[RB69SS396Conv]

It's constantly a problem.

Make sure the sealing beads of the headers meet the sealing surface of the heads. I've had some where there was exposed head port outside of the bead around the header port, particularly at the corners; and NO gasket ever made that work. Didn't matter what material the gaskets were made out of, there was still a leak where there was nothing holding the gasket against the hole. If you have that situation you have little choice but to get different headers.

I've also had them where the gasket had a square hole and the bead failed to completely cover that. Again, impossible for that to ever seal. Get a gasket with a smaller hole and enlarge it in places that don't compromise the seal if it covers part of the port.

 

[10secBu]

BTW, you can take a cheap white Mr. Gasket gasket and bolt it down and heat cycle the engine. Take the gaskets off and look at the impression on both sides to see of there are areas in the corner not sealing. I would not use these gaskets for any other purpose though as they are prone to leaking. Just thought they would make a good way to get and impression of the port & header flange for diagnostic purposes.

 

[427L88]

I did that and literally had to port match the heads and headers. Why for a street car? 'Cause I had to. Reversion and turbulence has an effect when you're running for hours at 3300 rpms as well. BTW, port matching can take you close to the welds on the primaries.

 

[65cayne]

I have the same problem and it sucks...I doubled up the Mr. Gasket paper gaskets with some high temp RTV and it has held for quite a while

 

[cv67]

With the others. Long as it covers the port youre good dont worry about the shape.

 

[383ram]

I am glad this was posted. I too have a set of round port headers I purchased and didn't realize my heads were square--this is on a big block. I was just going to check anyways as already been suggested for coverage on the weld of the port and the head. I figured if worse came to worse add weld on the port as needed and file down to match. I have $50 in my headers and they are new and never ran (swap meet special). But more importantly they fit my swap application into my truck so I didn't want to give them up.

 

[Ki_Power]

I got it fixed...

I ended up buying the round port gaskets made of carbon fiber...sprayed some ultra high temp gasket spray on it and bolted her together...no more leak!

Thanks for all your replies!

 

[66 BRONZE]

With the others. Long as it covers the port youre good dont worry about the shape.

Thats the way I am thinking as well. Good call Sheepster !!!!!:beers:

 

[Race ready]

What's the point in headers that aren't going to preform won't increase the h.p.if there's restrictionsi go with camle

hump manifolds

 

[chaze]

sumbodee neads ta lern howe to spel

 

[Pat_McNeil]

Back in 2011, I just used Rams Horn cylinder heads