I'm building a stock 68 440. I thought I saw in the service manual that there is NO exhaust manifold gasket to be installed on the 440. I took the exhaust manifold off the stock 383 that was in the car and it did not have an exhaust manifold gasket. So my question: Is there a significant down side to slapping the manifolds on naked? The mount surface on the heads is perfect and smooth. Test fit appears to be a seamless seal.
Thanks!
The FSM specifically states to use new gaskets when installing manifold.
Can't imagine there not being any.
Perhaps you read wrong
Edit: This was in the '69 manual. Maybe things had changed since '68?
There were no gaskets from the factory.....when new, the surface of both the head and the manifold were flat and true....and when no gasket was used, the cylinder head helped cool the manifold while at temp.....if a gasket is installed, you loose the heat transfer properties between the head and manifold because the gasket acted like an insulator
Now, with all that said.....most here will use a small flat gasket like the shiny Fel-Pro style under each manifold opening......you can try and go the "no gasket" route....but I bet you will find that a small exhaust leak will be present.....so that would mean taking off the manifolds again, possibly breaking off a stud or two in the process
Bryan
Most guys i know that go that route use a small amlunt of high temp rtv.
I went with no gaskets on mine. I replaced all the studs and sleeve nuts with new ones, had the manifolds surfaced, and a small amount of high temp rtv.
High temp rtv, let it skim up before tightening the bolts.
I'm in the flat/clean surfaces and thin smear of RTV camp.
I've never had a leak this way. (and have fixed many blown out gaskets with this method)
I'm the opposite... Ive always run gaskets and never had a problem... :shruggy:
Quote from: Rolling_Thunder on June 13, 2019, 05:35:14 PM
I'm the opposite... Ive always run gaskets and never had a problem... :shruggy:
Same here
:iagree:
My 69 all original Charger had no gaskets from the factory.
USE them. Unless, you want to do it twice.