I take his opinion into consideration. I also have to take everyone else’s opinion in this thread into consideration. I also have to consider Ford’s engineers and how they felt to properly seal the manifold. I also have to consider what if my manifolds aren’t completely straight. Sure, I could machine them (which costs more money), or I could use a <$20 gasket. It’s not that I ignored him, it’s that there are lots of factors at play.After everything Zray just said?
Differences in the two:I’m definitely using a gasket. Still trying to comprehend the differences in the two though.
^^^^^^^ +1"........ Note: Manifold sealing surface was flat when motor was new and using the composition gasket because it isn't is a Band-Aid to fixing it right, IMHO. Sort of like using RTV in place of lifter valley end seals.... but that's just me.
You are correct, that's a heat shield, protecting the spark plug boots. Exhaust manifolds typically had no gasket from the factory. I'm not aware of any Ford (or Chevy, for that matter) that had a gasket from the factory.Took the exhaust manifolds off my 410 today and there was no gasket. There’s a thin piece of sheet metal that I would call more of a heat shield than a gasket, but that was it. Is this normal? Should I go back with a gasket even though it didn’t have them originally? Below is a pic of the heat shield.
View attachment 738759
And that’s what I wanna go back with. My thinking is that if it has lasted these 50+ years from the factory, then it’s good enough for me.You are correct, that's a heat shield, protecting the spark plug boots. Exhaust manifolds typically had no gasket from the factory. I'm not aware of any Ford (or Chevy, for that matter) that had a gasket from the factory.
My grandpa bought this car brand new (1966 Mercury Monterey) in 66 and it’s all original, completely unmolested. 52,000 original miles. It sat in storage for 25 years."these" didn't last 50+ years. They were installed sometime between assembly line and the time you bought the car. 22GT's point was: when it rolled off the line, it didn't have gaskets or heat shields. Ford didn't waste any money on unnecessary parts on mass-production cars, and when Mustang hit the market it was all about mass-production.
I'm looking at a lot of advice here on going "no gaskets". There are lots of people with a lot more experience and knowledge than me. I've followed their advice (on this forum and the late, great CMF forum) since 2004.
I'm checking the box for "No Gaskets".
Do it once. Do it right... and machine them if you have to. You'll be happy you did. (I didn't have to... just sayin').
I did notice that screw and plate but was unaware what it was for.Since I just replaced the heat shield gasket on a '73 390 recently I'll offer a little information. The "choke stove" is located between the #3 and #4 exhaust ports. The stove is a hollow cavity that is supposedly filled with wire mesh. There is a square metal plate that covers the cavity on the engine side of the manifold. The cover plate is held to the manifold with a single, large head machine screw (I'm guessing it's at least a 1/4" screw and possibly a 5/16") with a slot for a blade screwdriver. The head of this screw is "proud" of the actual ports. In order to machine the manifold flat this screw will have to be removed. I can imagine what a PITA that will be with 40-50 years of heat cycles leading to rusted threads.
The new FelPro heat shields are marked LEFT and RIGHT. The right side has a tab with a half circle cutout that fits around the tube from the choke stove to the carb. So they serve some purpose other than simply protecting the spark plug boots.