3400 metal head gaskets

[Alxsmt]

does any1 know of a company that makes them? im just trying to increase the CR a little (i was told metal ones are thinner)

[TurboAlero]

That I now off thier isn't a company that makes metal head gaskets for the 3400 engines, hmm only head gaskets that are available is the copper ones, but I don't know where you can buy them now.
But you can call cometic gaskets or email damn and see if they can help you.

[AaronGTR]

tejohnson had some copper gaskets that he had custom made. They leaked on him though so I don't know if he's still using them or not. I don't exactly remember what the problem was with them, but I believe he had the block o-ringed and everything to go with them.

[TurboAlero]

I have them to installed , dont have any prob with them , I bought them from germ aka DPP

[SappySE107]

I have read and was told not to use copper on a daily driver because of heat cycling. It weakens the copper and you have to keep an eye on it. Cometic doesn't make gaskets and we need 150 sets ordered at once plus a block/head for them to make the design. I have the motor but I dont have the $$$ right now to get that done. Otherwise id be all over cometic gaskets now.

[rvbilly]

Head Gaskets

Hi all , So who makes a good gasket with less compressed thickness than the .042 or .040 stock thickness for our 660 `s? Did a search and only found shit for the 4.3 ! A gasket ( not copper ) with a .035 or .038 would be nice , Bill..

[AaronGTR]

No one. I don't think you'd want a thinner one anyway with our piston to head clearance as it is. Mill the head if you really want that tiny bit of compression increase that will make almost no difference.

[farmerz24]

who made tejohnson the copper head gaskets?

[rvbilly]

Head gasket

Hi to all, but shaving the head for that little bit of difference with my block allready 0 decked will make a difference , even if it`s only say 5 Hp it all adds up..Thanks Bill..

[Superdave]

don't use thinner gaskets on the 3400, you'll have the piston kissing the head in no time. you need .040 or so clearance and that's just right with the .060" gasket and the .020 piston pop-up.

[Alxsmt]

oh i didnt know that!! i have flat top pistons with 3500 heads, i hope there isnt an issue when i put it back together.

i guess i will be sticking with stock head gasket.

any1 got any info oh O ringing a block? postives and negatives?

[Superdave]

oh i didnt know that!! i have flat top pistons with 3500 heads, i hope there isnt an issue when i put it back together.

i guess i will be sticking with stock head gasket.

any1 got any info oh O ringing a block? postives and negatives?

what pistons?


if you are using the iron head pistons you can run the thinner gasket. ROL makes a .045 compressed one that should handle the upped compression very well. It's graphite. Same one i'm using on my 3500...


stock 3400 pistons pop out of the deck .020" but they are dished. Your flat tops may not pop out.. there is an easy way to find out though...

[PCGUY112887]

Anyone have any idea what makes the Felpro Extreme Duty head gaskets special? Any way they would work here?

[blackbombshell95]

I'm also searching for a metal headgasket. Alxsmt would you happen to be the guy who is having ur engine built at auburn auto machine in WA state?

[Alxsmt]

i am using MTI i believe lol, a local shop got them for me, only $390 or something like that. i am having a shop in mulino, oregon do the machine work for me