Intake gasket question

[gregpro50]

OK I give up, why do aftermarket intake manufacturers recommend the use of Fel-Pro #1250 intake gaskets ?? Why cant I just use the regular Fel-Pro gasket that the parts stores carry ??? The intake is a proffesional products typhoon. The car is a '92 GT. I think I remember the edelbrocks recommending the same gasket...

 

[281pony]

1250 in place of what? which intake?

 

[tmoss]

You can use the stock replacement complete set - Fel Pro #MS93334. You won't be able to use the upper-to-lower gasket, but so what. The kit comes with lower intake-to-head gaskets that have runners that are 1.15"wx1.90" tall, really nice silicone rubber end seals (vs the cork junk), a distributor O-ring. Best part is you can get the set anywhere for about $15.

 

[gregpro50]

I cant find the 1250 gaskets anywhere around here. None of the parts stores have them. Summit has them for about $30 including shipping..

 

[gregpro50]

The instructions also say to eliminate the end seals and instead to use a 1/4" bead of RTV. Does this sound like a good idea ?? I only want to do this once...

 

[tmoss]

With the kit I mentioned, use the rubber gaskets and use just a dollop of RTV on the rubber gaskets at the head. I've never had one leak.

 

[cmozez]

I have the 1250 kit, do I need to use the end gaskets or RTV?

 

[tmoss]

The 1250 gaskets don't come with the good silicone rubber end seals. Use the RTV.

 

[5spd GT]

I didn't use the blockend gaskets on mine...just a nice thick bead of hightemp silicone and all is well

 

[blown1989saleen]

I believe the parts store replacement gaskets are actually smaller than the 1250, and FWIW ive been using the cork gaskets for years and have NEVER had a problem, i make sure the block is completely clean before sticking the self adhesive cork gaskets down then put a very small amount of RTV on top of the cork ends. IMHO i would only use the 1250 there IS a size difference

 

[EMW150]

The Printoseal type gaskets (1250,1262,etc) are better than the stock replacement type. The main reason to go with RTV on the end seals is mostly because when you start deviating from stock heads and intakes, you may see a change in the gap between the intake and the block at the end seals. A cork or rubber seal may not be able to compensate for the change and will either try to squeeze out or just be too short and not seal. I always use about a 1/4" bead of RTV Ultra Black right before I set the intake down. That way it conforms to the correct gap. Never had a leak.

 

[tmoss]

I believe the parts store replacement gaskets are actually smaller than the 1250....there IS a size difference

Yes there is but the MS93334 runners are 1.11" x 1.95" which is bigger than many stock aftermarket lower runners when not ported.

The silicone rubber seals in the kit are .160" thick and have side rails molded in that keep the seal from moving when the intake is set down on it.

The printo-seal is a paper gasket with rubber traces attached. The "blue stripe" in the kit are metal with a nice coating on the entire gasket on both sides.

The kit is a nice option, has more parts in it and is half the cost of the 1250 kit. I use it on my Explorer because I think the quality is much better and I just get an upper-to-lower seperately if I need to replace it.