Sr headgasket Q's

[idamaster]

Im about to pull my head right now and I wanted to get a thicker headgasket. Ive been told to go with a 1.5 but what are the pros/cons of a 1.5 and a 1.1 or does it not matter at all? Q #2: Is there any major benifit from ARP head studs for higher boost?

[okisrniju]

I was wondering the same thing. I don't plan on boosting past 1.2 but I do have a 1.2 mm headgasket. Someone told me that I'll have to shave the head if I get a thicker headgasket for compression. Is that true?

[idamaster]

I was wondering the same thing. I don't plan on boosting past 1.2 but I do have a 1.2 mm headgasket. Someone told me that I'll have to shave the head if I get a thicker headgasket for compression. Is that true?
If you get your head machine you need a thicker head gasket to compensate for the loss of metal. Just my guess.

[HYPNOTIK]

Unless you have a reason to lower your compression there is no reason to get a thicker headgasket. Especially if your running stock bottom end I would not lower the compression, stock pistons are 8.3:1, if anything I'd go with a smaller headgasket to raise compression. If you have the head shaved and it's still within spec there is still no reason for a thicker headgasket. If your head is shaved enough that you need to compensate with a thicker headgasket then it's time for a new head.

Def get some ARP studs or at the very minimium some new stock head bolts. Don't reuse your stock bolts, they stretch.

It's a good idea to get the head shaved when you replace the head gasket with a metal one to ensure a perfectly flat mating surface so that you get a good seal.

You should be fine with the 1.1mm.

[idamaster]

The reason I want to get a thicker head gasket is because I want to turn my boost up to about 16 psi. With supporting mods of course.

[HYPNOTIK]

You still don't need a thicker headgasket. I plan on running 1.5bar w/ 9:1 compression.

[idamaster]

Well is there a loss of power with a thicker headgasket at stock boost? Just a random question.

[ericb382]

Yes. IMHO get a .8 and crank the boost.

[idamaster]

Do the headstuds go on first or do you put the head on THEN put the headstuds on?

[VNG704]

Follow the FSM. Acronym for Factory Service manual. If you don't have one, the .pdf file is free for downloading online. Answers most your DIY questions you'll have.









I put the head on first.

[HaSo240sx]

I would do the head studs and on the s14 sr motor the headgaskets f up on higher boost, but sence your pulling the head might as well doit i would suggest the apexi...

[idamaster]

I would do the head studs and on the s14 sr motor the headgaskets f up on higher boost, but sence your pulling the head might as well doit i would suggest the apexi...
I already have arp studs. I was asking if they go on before I put the head or after.

[Sileighty_85]

, stock pistons are 8.3:1, .

Stock Compression Ratio is 8.5:1, just wanna clear that up

Running a thicker head gasket is not a bad thing, it lowers the chances of detionation at high boost compared to a Higher compression boosted engine, But really its all in the tune, if you can get a good tune your safe.

Im running a 1.5 mil PE head gasket boosting 21psi with no issues.

[slamn240]

i put them on after you put the head on. that is what ii did when i use to builted sr's for sr motorcars

[xdumbxguyx]

put the head on first then the arp studs
make sure to put a light layer of silicone over the oil pump area where the head gasket seats on
1.1mm headgasket should be fine for ur appication