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Topic Review (Newest First)
11-21-2006 03:13 PM
PatM On the wife's Small Block Vette, we had header gasket failure about every 3 to 6 months. Diffent gaskets, same problem. Finally, I threw two solutions at the problem at one time. Soft Copper Gaskets (Mr. Gasket, I think) and Stage 8 bolts. Whether it's the bolts not trying to come loose, or the gasket being indestructible, I don't know. I only know the combination works. The headers aren't fancy, just a pair off-brand shortys, but they don't leak anymore.

11-21-2006 02:55 PM
Irelands child
Originally Posted by poncho62
Just like johnsongrass1, I use the stock metal backed ones that you get in gasket sets. I have found over the years, that its more the bolts you use and how you tighten them more than what gaskets you use. When installing new gaskets, check for tightness the 1st few times you heat the engine.
Normally I would agree with you - except the @#$* GT40P heads w/Sanderson headers didn't leave me much of a choice along with the expen$ive header $tud$. But these Earl's gaskets are nice !!!

11-21-2006 02:26 PM
poncho62 Just like johnsongrass1, I use the stock metal backed ones that you get in gasket sets. I have found over the years, that its more the bolts you use and how you tighten them more than what gaskets you use. When installing new gaskets, check for tightness the 1st few times you heat the engine.
11-21-2006 02:21 PM
Originally Posted by Irelands child
Take a look at Earl's.
I second the Earl's.

I have used them with great success.

11-21-2006 02:00 PM
Irelands child Take a look at Earl's. I had a problem with my GT40 heads and the interface with Sanderson headers and had tried several other brands for fit up. I also had to use Breslin header bolts, again because of the headers. Even ARP studs wouldn't fit. Reasonably priced tho not cheap

Below is the Earl's description - you just replace the insert rather than the entire gasket assembly.
"Pressure Master Header Seal, for Ford 289–302–351W (Except Boss), Pair – Designed and manufactured for Earl's by Parker–Hannifin Corporation, these seals are the first High Performance Seals developed to solve automotive sealing problems using Aerospace Technology.
Pressure Master Header Seal, for Ford 289–302–351W (Except Boss),
Installation Notes
The graphite foil sealing inserts can be replaced in the aluminum retainer, making it an economical solution to tough sealing problems. Replace the seals on a smooth flat surface using even pressure for best results.
Uses Aerospace Technology
Graphite Foil Sealing Inserts
Virtually Leakproof
Seals Up To 1200% Better
Superior Torque Retention
Longer Lasting Pre-Load
90% Break Loose Torque"

11-21-2006 01:38 PM
Rick WI On header flanges we always use Fel Pro, never an issue unless the flange is warped or the bolts are not tight. On the collector fireplace caulk is pretty bulletproof.
11-21-2006 01:10 PM
Mustangsaly I like the copper ones, thats all I use now. I had a 390 Ford yrs ago (I don't remember the header brand name) It seemed no way would I get 10 to 14mons on a set of header gaskets. I had one leaking and when no one in town had any header gaskets someone offered me a stock exhaust manifold gaskets, being desperate I put a set of stock exhaust manifold gaskets on, and never had another leak. I haven't tried stock exhaust manifold gaskets since. but it was a easy swap, there was no a/c no extras in the way it was a 69 Ford p/u.

11-21-2006 11:00 AM
Guy Hiltz
Header gasket/collector gaskets

I cant say much about collector gaskets as my headers/exhaust are welded together,but I have had the cheapie Mr Gasket ones on for a couple of years now,even had them off and reused them last time I had the motor out.I do pay close attention to keeping the exhaust bolts snugged up,I usually do this once or twice a month,this seems to help quite a bit.If your headers get a little loose this can cause gasket problems.
11-21-2006 10:56 AM
johnsongrass1 Not much you can do with the collectors. Looks like the flanges are bent. You will never get a seal to stay in there. Keep the aluminum ones or cut off the collector and change flanges.

Stock printed metal ones last the longest for me. Good bolts help too. So do good threads. Put the metal to the header side. the last set I used is going on three years. I even use them and gasket match the port's to fit my race engines.
11-21-2006 10:51 AM
Header gasket/collector gaskets

Does anyone have a favorite header or collector gasket that actually lasts?

I had the Mr. Gasket high dollar "Ultra seal" header gaskets on this time, left side lasted 16 months. Went back to the basic white Mr. Gasket since spending 22 bucks on the first ones was pretty much a waste.

I also tried the super fancy whizz bang soft aluminum collector gaskets on my truck and my sons truck. Those things popped and clicked and moved all over the place in the heat cycles. Went back to the Mr. Gasket basic white gaskets today since I already had all my tools out.

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