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  #16 (permalink)  
Old 11-30-2006, 06:59 PM
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Quote:
Originally Posted by onovakind67
The best header gasket is one that seals between two flat surfaces. If your headers are not flat, you will probably have difficulty with the sealing. I use a standard Fel-Pro gasket after I surface the header flange.
Absolutely correct. If the surfaces are not flat you can develop a problem with any gasket. I use the standard Fel-Pro also with Hooker ceramic headers and Dart Eagle Platinum heads. The bolts don't loosen up either ! Remember the old stock SBC engines all had cast iron manifolds that bolted directly to the heads with no gaskets at all and they did not leak.

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Old 11-30-2006, 07:39 PM
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Quote:
Originally Posted by GCD1962
Absolutely correct. If the surfaces are not flat you can develop a problem with any gasket. I use the standard Fel-Pro also with Hooker ceramic headers and Dart Eagle Platinum heads. The bolts don't loosen up either ! Remember the old stock SBC engines all had cast iron manifolds that bolted directly to the heads with no gaskets at all and they did not leak.
lots of Ford I6's were the same way. my 200 had no gasket, from stock only certin years got them., but mine did not get them, never leaked, tore the motor down 3 weeks ago for a rebuild.
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Old 12-01-2006, 04:40 PM
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Quote:
Originally Posted by woodz428
I don't use header gaskets any more, haven't for about 4 years and have had no failures on several Cobras as well as 2 428CJ Mustangs. I use Permatex High temp(copper) gasket maker. It is important that both surfaces be clean and oil free. I apply it on the header evenly but not too thick and then hand tighten the header bolts so they have some light compression on the sealant. I then allow it to set up(cure) overnight, sometimes a day or so if I'm doing other work, and then tighten the bolts to torque. It works great and eliminated the problem I had on my 351 Cleveland with having to replace one or the other gaskets every 6 months or so.

I agree totally with this approach. Years ago, the guys at Dick Landy's shop clued me into just using Permatex. I have had great luck just using the red high temp Permatex sealer. The copper stuff is probably better. Even though the actual exhaust temps get higher than what the sealer is rated for, the head and the header flange don't actually get that hot. I have used this procedure on a number of blown engines with great success.
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Old 12-01-2006, 04:53 PM
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There are blow proof gaskets available that are made like aircraft exhaust gaskets. $$$$

The premium headers with thicker flanges have less leakage problem because the flanges have less flex.

The thing that most of us overlook is the fact that that looooong header and the even looooonger exhaust system is hanging and vibrating on the gasket flanges. That's a lot of leverage back there. Build a support from the collector to the block/trans and your problems will go away (if your header flanges are flat).
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Old 02-15-2014, 04:26 AM
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Is there a "preferred" gasket for aluminum heads with headers?
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Old 02-15-2014, 06:26 AM
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If you are not running a heat cycle or 2 and then going back after a full cool down to torque the bolts your making a mistake.
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Old 02-15-2014, 07:31 AM
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Originally Posted by diehrd View Post
If you are not running a heat cycle or 2 and then going back after a full cool down to torque the bolts your making a mistake.
That's a given....what about the gaskets?
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Old 02-15-2014, 07:47 AM
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It may be a given and I may have missed it but I had not see any post mention it and it is the most common cause of leaks.

I use Mr gasket Ultra seal 5907
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Old 02-15-2014, 09:06 AM
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31roc you may get some better responses if you start a new thread . This one is 8 years old
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Old 02-15-2014, 10:03 AM
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Best on the market for uneven surfaces.

Remflex Exhaust Header / Manifold Gaskets

You need to follow the instructions.
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Old 02-17-2014, 03:47 PM
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Ok...narrowed down to remflex and Percys....now-
if heads are square port, and headers are round port, which shape should the gaskets be?
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Old 02-17-2014, 06:58 PM
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SBC: I prefer FEL-PRO MS 9275 B Exhaust Manifold Gaskets on headers.... paper side toward the head, foil side toward the header.
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Old 02-18-2014, 09:33 AM
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Whichever is the larger opening. If they're almost the same, Id probably use the square gasket shape, trying to cover the corners of the square port with a round gasket sounds like a recipe for disaster. Id also use a locking-type header bolt like "Stage 8".

Make sure your flanges on the headers are true BTW

Quote:
Originally Posted by 31ROC View Post
Ok...narrowed down to remflex and Percys....now-
if heads are square port, and headers are round port, which shape should the gaskets be?
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