I am removing and replacing a 390 Intake Manifold that had part of front gasket partially blown out. I bought a gasket kit, but have seen some builders just put a good sized bead of black Permatex on front and back instead of using cork gasket at all. Argument is that it takes care any imperfections and seals better long term.

Any recommendations as to what works you find works best? Of course, you have the argument that the factory used a gasket. I am not a "Motor head" or rebuilder, so looking for recommendations. (Not to start any arguments in thread!)

Hoping to do it right the first time!

 

while opinions vary
I prefer gasket plus permatex

 

Thanks for your input!

 

What @MIKES 68 F100 said but watch the backside. That's where I had problems sealing. Give the sealant time to set up.

If it were me & I was pulling the intake, I'd be buying an aluminum replacement & drop that 5000# monster paperweight/door stopper.
Ok so maybe not that much weight but it sure felt like it..

Dan

 

I think the stock intake is 89 LBS, about the same as the hood!

 

Thanks for the input and recommendations!

 

American Iron at its finest!

 

I too would used a gasket and a bit of permatex. But 1st I would take a pointed punch and a good sized hammer and put some dimples in the front and rear "China Walls. To help hold the gaskets in place. This however, makes it necessary for you to mount the intake Straight down. No fidgeting it around. A wide bead of RTV is more forgiving.
Make sure your PCV system is hooked up correct and working. If not,it can blow a gasket right back out.

 

When using RTV a gasket isn't needed and often will cause leaks when the cork becomes a void in the RTV. There is a much better RTV for this purpose and its Motorcraft Grey TA-31 RTV. It's a firm set high temperature RTV and it's what has been used for the last 20 years for engine assembly. No it's not cheap like the parts store permatex but it works. As with any RTV you should use a metal prep solvent for adhesion. You can use the Motorcraft ZC-30.

 

+1 on ditching the Iron intake for an Aluminum . I got a used edelbrock performer for $75 locally . just needed 1 broken bolt extracted .

 

Good job on promoting the Correct stuff to use. You must either be a Ford Tech or a Ford Partsman.