Exhaust leak at manifold
 

i have a exhaust leak at the header where it bolts to the block. i have, changed the gasket, and still leaks. i won't to get the header resurfaced.its the cast iron one. do i need to get the intake resurfaced with it, so they can take off the same amount

Re: Exhaust leak at manifold
 

this is the set up i have

Re: Exhaust leak at manifold
 

Would using muffler cement for gasket sealer work?

Re: Exhaust leak at manifold
 

Photos added while I was typing. My suggestion was about original type setup.

Re: Exhaust leak at manifold
 

i would think you need the same amount of material from both. would that be right?

Re: Exhaust leak at manifold
 

Re: Exhaust leak at manifold
 

Measure the tabs on the manifolds,if the intake and exhaust are different thicknesses it will affect your clamping force.You can avoid the machine shop as well.

Re: Exhaust leak at manifold
 

The problems with stock cast iron manifolds is that over time the rear cylinder port will droop. When this happens you can never line up all four ports anymore. The only fix is a new manifold.

Re: Exhaust leak at manifold
 

Do you have a way to hold the two together so you can straight edge the block mating edge? . The key is as mentioned, the ears the concave washers go on, have to be the same height, as well as the two manifolds have to be flush.

Re: Exhaust leak at manifold
 

The cast header and weber intake are stout,no 'droop'like on an A exhaust manifold. Im doing a vacuum leak on one lashed to a Miller/Serr head..the washers provided dont bridge as well as stock A ones do.the tab height is critical for a good seal.

Re: Exhaust leak at manifold
 

Buy the repro exhaust and intake manifold setup. They are well worth the money and along with an Aries muffler you will achieve a leak less setup that sounds like a Model A should.

Re: Exhaust leak at manifold
 

I concur with Ron on above post. I saw a young fellow last week who spent a lot of money in a Weber and header setup like that and in all honesty he would have saved a ton of money and ran better for his stock worn out engine than the setup. Unfortunate advice and way to much unnecessary funds spent from the forum here in my opinion.

His appeared to havechecsamd issue. I think it should be surfaced the same but agree the larger face washers would pull in better then he small ones supplied.

My vote would be a stock manifold but you’ll most likely have to find someone willing to surface them to get them to seal properly
Larry shepard

Re: Exhaust leak at manifold
 

Here is something you might try with the manifold. I know he is resurfacing a head, but it may be worth a try.
https://www.youtube.com/watch?v=SK2R2LdkLKs&t=7s

Re: Exhaust leak at manifold
 

Last Fall, I took delivery on a cast iron header as you show in your photo in Post #2. It was warped right from the supplier. I noticed it before I installed it and Snyder's promptly shipped me a replacement that was straight.

Something happened during the machining...Maybe you received one from the same batch!

The photos you show look like new product...Maybe you could exchange it for a straight one.
Good Day!

Re: Exhaust leak at manifold
 

i took the manifold off today. took it to the Machine shop, he checked it with a straight edge. it was straight. the gasket dose not fit right. you can see where it dose not fit. there was a bad casting. i had it on the car where it did not leak. i have to order a new gasket and fit it right

Re: Exhaust leak at manifold
 

Use muffler caulk (cement)! That is what I used for joining the exhaust pipe to the manifold, been that way now for over a year. No reason the same will not work between engine and exhaust manifold!