Headgaskets Help

[burko1]

I Know You Guys Are Pretty Cluey So I'll Hit Yous Up With Another Question.

Whats The Best Headgasket To Put On To A R33 Gtst - Rb25det?

Im Looking At Running About 25psi.

I Have Just Been Quoted On A Tomei Gasket And They Aren't That Cheap.

Any Suggestions On What To Use

[burko1]

anyone?

[R31Nismoid]

i know a lot are using tomei.

i am. Cost shouldnt be an issue IMO.

[jas/slo32]

trust grex headgasket many sizes available mine withheald 30 psi boost @ 1068rwhp

available from any autobarn store

[hungry6]

I've always used stock ones. No problems on 3 different engines, but then I never tried tomei one, so I have no ideas what I'm missing out also. The power levels of the 3 engines varied from 420 to approx 600 rwhp. Just from past experience, it take alot of R&D to beat a manufacturer for reliability and consistantcy.

[burko1]

trust grex headgasket many sizes available mine withheald 30 psi boost @ 1068rwhp

available from any autobarn store

any idea on the price of them?

[CRSRB25DE]

Head gaskets from tomei, trust etc just look like a rebadged/stamped "cometic"(brand) gasket to me.

A fraction of the price.

Nothing wrong with a std one though.

[proengines]

A cometic MLS gasket is $330 or so. We've used them for quite a while without any failures. The block and head do need to be very flat and have a good surface finish to seal properly, it's the same with any MLS gasket.

[CRSRB25DE]

ACL are meant to be coming out with MLS gasket soon.

I know they are making them for the gen3's soon and

plans for import/turbo cars.

Proengines, Do you know what surface finish is required for these gaskets? i know it is pretty smooth.

We havent had any failures either, but ive been meaning to get the RA guage out and check what we are running.

[proengines]

ACL are meant to be coming out with MLS gasket soon.

I know they are making them for the gen3's soon and

plans for import/turbo cars.

Proengines, Do you know what surface finish is required for these gaskets? i know it is pretty smooth.

We havent had any failures either, but ive been meaning to get the RA guage out and check what we are running.

<{POST_SNAPBACK}>

Off the top of my head an Ra of 25 or less works fine, we use a CBN cutter on the block and a PCD cutter on the head. Waviness is important too, we've had blocks come through that have been surface ground and look great but you find that the grinder wheel drops down where it runs across the bores and rises up between them where there is more metal to cut. Sometimes it takes .003-4" to mill them flat again. I think any finish that you can catch your fingernail on is probably too coarse. (very cheap Ra gauge!)

I've heard that the new ACL MLS gaskets are made by Cometic. If the price is right though it may be a good thing.

[CRSRB25DE]

Rumour has it the ACL MLS are only meant to be around the $150ish mark. fingers crossed.

We are the same as you for head and block surfacing. Pcd cutter for head, cbn for block.

Grinders can be funny like that. Very light cuts can eliminate the problems but it helps if the machine isnt flogged out and 60 years old.

Might be getting a new one.

Does your workshop have a dedicated surfacer/grinder?

3-4 thou is pretty dam dodgey hey.

[proengines]

That price sounds pretty good! We use a vertical mill with a 14" flycutter running at around 850rpm. I'd love to have a dedicated surface mill but can't justify the cost for the volume of work we put through.