Need tips on LIM gasket, boost-proof.

[ForcedFirebird]

Felpro uses a little nub on the gasket that just lets you rest the pushrod on to hold it in place. The GM gaskets have the loop you see in the pic.

That pic is a 3500 gasket on a 3400 head .

Here is the 3500 gasket on a 3500 head...

[19Cutlass94]

hmm... now I gotta go look at mine... cause the gasket is bigger than the port, but I dont think its that tall though... I could be wrong. And I notice GM/Felpro keeps going back and forth between having the guide plates on the gaskets and not having them there.

[ForcedFirebird]

How much bigger are the ports on the heads from 3500 from the 3400... The 3400 LIM gaskets are huge on the heads... even though I dont think you could use 3400 gaskets on the 3500

Here's a pic of a 3500 gasket on a 3400 head (I need to take one with 3400 gaskets on a 3500 head too)...

[19Cutlass94]

How much bigger are the ports on the heads from 3500 from the 3400... The 3400 LIM gaskets are huge on the heads... even though I dont think you could use 3400 gaskets on the 3500

[loner666]

ok..i knew the upper was metal but you had me wondering about the lower there for a min

[ForcedFirebird]

really? damnit..i wish i knew that before..the gasket Ben sent me for my 3500 top swap had plastic lower intake gaskets

3500 LIM gaskets are plastic, the UIM is metal. There is no aftermarket gaskets for the 3500's yet. Sorry for the earlier post. I thought eldiablo was talking about the UIM gasket being metal in the 3500 set, even though it's clearly typed "LIM"

Here's a pic of a 3500 gasket set, I got the same one from GM...

[ForcedFirebird]

really? damnit..i wish i knew that before..the gasket Ben sent me for my 3500 top swap had plastic lower intake gaskets

3500 LIM gaskets are plastic, the UIM is metal. There is no aftermarket gaskets for the 3500's yet.

[loner666]

the 3500 top end set also uses a metal LIM gasket if memory serves me correctly...

really? damnit..i wish i knew that before..the gasket Ben sent me for my 3500 top swap had plastic lower intake gaskets

[3XTurboAgain]

Thank You

[ForcedFirebird]

so MS 98003 T is LIM gaskets i need? I plan on getting the UIM spacer anyway. All i need to know because im pretty sure thse plastic ones are crap. Thanks

Yes.

[3XTurboAgain]

so MS 98003 T is LIM gaskets i need? I plan on getting the UIM spacer anyway. All i need to know because im pretty sure thse plastic ones are crap. Thanks

[El_Diablo]

do i get a cookie?

[ForcedFirebird]

the 3500 top end set also uses a metal LIM gasket if memory serves me correctly...

You are correct, I have a set of both the Felpro metal gaskets and 3500 GM stock gaskets here. I was hoping to be able to get the metal UIM gasket by itself to use with the 3400 stuff in the garage,

[El_Diablo]

the 3500 top end set also uses a metal LIM gasket if memory serves me correctly...

[ForcedFirebird]

wow thats strange you got metal UIM and I got the paper UIM. I think ive been screwed!

No, the metal UIM gasket came with the GM top end gasket kit for the 3500. The part number I gave is for big port 3100/3400's.