# SR20 headgasket question **URL:** \ **Category:** Canada Nissan Automotive\ **Created:** [June 9, 2005, 8:07pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243 "2005-06-09T20:07:32Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![Apexi240](https://avatars.discourse-cdn.com/v4/letter/a/e9c0ed/32.png) [@Apexi240](https://forums.speedlife.net/u/Apexi240)\ **Post date:** [June 9, 2005, 8:07pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/1 "2005-06-09T20:07:32Z")
For an S13 Redtop SR20DET: I have 9.0:1 compression pistons as compared to the stock 8.5:1 compression ratio. Now what size of metal head gasket will I need without reducing that compression ratio by too much? Greddy 1mm? ---
**Author:** ![Nis240](https://avatars.discourse-cdn.com/v4/letter/n/a9a28c/32.png) [@Nis240](https://forums.speedlife.net/u/Nis240)\ **Post date:** [June 9, 2005, 9:31pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/2 "2005-06-09T21:31:08Z")
Why did you get higher comp pistons? ---
**Author:** ![1mns13](https://avatars.discourse-cdn.com/v4/letter/1/8491ac/32.png) [@1mns13](https://forums.speedlife.net/u/1mns13)\ **Post date:** [June 9, 2005, 9:57pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/3 "2005-06-09T21:57:52Z")
I wouldn’t go less than 9.0:1 with new pistons, more power all around. I believe stock is 1.1mm. Depending on your cam lift , I’d probably go 1.2 mm. ---
**Author:** ![Apexi240](https://avatars.discourse-cdn.com/v4/letter/a/e9c0ed/32.png) [@Apexi240](https://forums.speedlife.net/u/Apexi240)\ **Post date:** [June 12, 2005, 7:48pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/4 "2005-06-12T19:48:43Z")
> [@1mns13](#): > > I wouldn’t go less than 9.0:1 with new pistons, more power all around. I believe stock is 1.1mm. Depending on your cam lift , I’d probably go 1.2 mm. I’ll be running 256’s on both intake and exhaust. And to answer the last question, higher compression=more power. ---
**Author:** ![silvia\_sr20det\_s13](https://avatars.discourse-cdn.com/v4/letter/s/ed655f/32.png) [@silvia\_sr20det\_s13](https://forums.speedlife.net/u/silvia_sr20det_s13)\ **Post date:** [June 12, 2005, 9:06pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/5 "2005-06-12T21:06:38Z")
> [@Apexi240](#): > > [quote=1mns13]I wouldn’t go less than 9.0:1 with new pistons, more power all around. I believe stock is 1.1mm. Depending on your cam lift , I’d probably go 1.2 mm. I’ll be running 256’s on both intake and exhaust. And to answer the last question, higher compression=more power.[/quote] but doesnt that mean u cant run as much boost safely…i thought higher comp pistons only really worked good on NA motors? dont burn me if i am wrong ---
**Author:** ![Nis240](https://avatars.discourse-cdn.com/v4/letter/n/a9a28c/32.png) [@Nis240](https://forums.speedlife.net/u/Nis240)\ **Post date:** [June 12, 2005, 9:19pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/6 "2005-06-12T21:19:30Z")
> [@silvia\_sr20det\_s13](#): > > [quote=Apexi240][quote=1mns13]I wouldn’t go less than 9.0:1 with new pistons, more power all around. I believe stock is 1.1mm. Depending on your cam lift , I’d probably go 1.2 mm. I’ll be running 256’s on both intake and exhaust. And to answer the last question, higher compression=more power.[/quote] but doesnt that mean u cant run as much boost safely…i thought higher comp pistons only really worked good on NA motors? dont burn me if i am wrong[/quote] Thats why i asked. ---
**Author:** ![SRBURG13](https://avatars.discourse-cdn.com/v4/letter/s/9fc29f/32.png) [@SRBURG13](https://forums.speedlife.net/u/SRBURG13)\ **Post date:** [June 12, 2005, 10:15pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/7 "2005-06-12T22:15:10Z")
Thats what I thought. ---
**Author:** ![Apexi240](https://avatars.discourse-cdn.com/v4/letter/a/e9c0ed/32.png) [@Apexi240](https://forums.speedlife.net/u/Apexi240)\ **Post date:** [June 12, 2005, 10:15pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/8 "2005-06-12T22:15:49Z")
True you can’t run as much boost, but your increasing volumetric effieciency which provides more power. Everybody goes different ways. The only thing I’m concerned about is detention which I can control with an intercooler and higher octane fuel. They also provide thermal efficiency which turns fuel into more useable power because it burns hotter. ---
**Author:** ![DeathBy240](https://avatars.discourse-cdn.com/v4/letter/d/258eb7/32.png) [@DeathBy240](https://forums.speedlife.net/u/DeathBy240)\ **Post date:** [June 12, 2005, 10:19pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/9 "2005-06-12T22:19:15Z")
> [@Apexi240](#): > > The only thing I’m concerned about is detention which I can control with an intercooler and higher octane fuel. Is your teacher gonna tell you to sit in the corner? ---
**Author:** ![Apexi240](https://avatars.discourse-cdn.com/v4/letter/a/e9c0ed/32.png) [@Apexi240](https://forums.speedlife.net/u/Apexi240)\ **Post date:** [June 12, 2005, 10:20pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/10 "2005-06-12T22:20:56Z")
lol what the hell are you talking about Dave? ---
**Author:** ![SRBURG13](https://avatars.discourse-cdn.com/v4/letter/s/9fc29f/32.png) [@SRBURG13](https://forums.speedlife.net/u/SRBURG13)\ **Post date:** [June 12, 2005, 10:21pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/11 "2005-06-12T22:21:44Z")
> [@Apexi240](#): > > The only thing I’m concerned about is **detention** which I can control with an intercooler and higher octane fuel. ---
**Author:** ![Apexi240](https://avatars.discourse-cdn.com/v4/letter/a/e9c0ed/32.png) [@Apexi240](https://forums.speedlife.net/u/Apexi240)\ **Post date:** [June 12, 2005, 10:25pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/12 "2005-06-12T22:25:23Z")
> [@SRBURG13](#): > > [quote=Apexi240]The only thing I’m concerned about is **detention** which I can control with an intercooler and higher octane fuel. [/quote] lol oh fuck. I meant detonation. Gimmie a break. I had alittle too much :drinkers: on the weekend and I’m tired! ---
**Author:** ![1mns13](https://avatars.discourse-cdn.com/v4/letter/1/8491ac/32.png) [@1mns13](https://forums.speedlife.net/u/1mns13)\ **Post date:** [June 13, 2005, 5:39am UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/13 "2005-06-13T05:39:13Z")
> [@Apexi240](#): > > [quote=1mns13]I wouldn’t go less than 9.0:1 with new pistons, more power all around. I believe stock is 1.1mm. Depending on your cam lift , I’d probably go 1.2 mm. I’ll be running 256’s on both intake and exhaust. And to answer the last question, higher compression=more power.[/quote] But what lift? Duration doesn’t affect piston height. ---
**Author:** ![Apexi240](https://avatars.discourse-cdn.com/v4/letter/a/e9c0ed/32.png) [@Apexi240](https://forums.speedlife.net/u/Apexi240)\ **Post date:** [June 13, 2005, 6:53pm UTC](https://forums.speedlife.net/t/sr20-headgasket-question/139243/14 "2005-06-13T18:53:30Z")
10.5mm lift