# head gasket
**URL:** https://forums.speedlife.net/t/head-gasket/144368
**Category:** Canada Nissan Automotive
**Created:** [September 22, 2006, 4:38pm UTC](https://forums.speedlife.net/t/head-gasket/144368 "2006-09-22T16:38:09Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@blue\_monkey\_man](https://forums.speedlife.net/u/blue_monkey_man)
#### Post date: [September 22, 2006, 4:38pm UTC](https://forums.speedlife.net/t/head-gasket/144368/1 "2006-09-22T16:38:09Z")
hey, does anyone know where to find what the compression ratio will be when you replace the headgasket on the sr. Lets say if you put a .8 gasket compared to a 1.8? I’ve tried to do the math but i need to know the volume of the combustion chamber, deck height and volume on top of the piston.
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### Author:  [@RS13](https://forums.speedlife.net/u/RS13)
#### Post date: [September 22, 2006, 4:43pm UTC](https://forums.speedlife.net/t/head-gasket/144368/2 "2006-09-22T16:43:40Z")
The compresion ratio will only change about + or - .2
Get the head decked, ask them how much they took off. Buy a Head gasket accordingly.
If you are buying a gasket to change compression ratio, well good luck
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### Author:  [@Nis240](https://forums.speedlife.net/u/Nis240)
#### Post date: [September 22, 2006, 9:54pm UTC](https://forums.speedlife.net/t/head-gasket/144368/3 "2006-09-22T21:54:42Z")
> [@RS13](#):
>
> The compresion ratio will only change about + or - .2
>
> Get the head decked, ask them how much they took off. Buy a Head gasket accordingly.
>
> If you are buying a gasket to change compression ratio, well good luck
Thicker head gasket= Band aid
A good tune will stretch the head gasket to its maximum limits. A bad tune will blow a head gasket before its limits.