Headgasket 1mm over bore - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

YoungGun · 11-10-2009, 05:59 PM

Hey bros I got a quick question for yall.

I picked up a 1.1mm thick apexi headgasket 86mm stock bore, but when I picked it up the guy that was helping me said that apexi actually makes the gaskets 1mm over the bore size which would essentially make it 87mm.

This is not my question, long story short i'm going to trade in this gasket for a thicker one because the machine shop had to take off a lot from the block.

Would it be okay to buy a 87mm gasket from cosworth? I am using stock pistons and stock bore, if anyone has any insight please let me know thanks!

GSXRJJordan · 11-10-2009, 06:23 PM

You always want a head gasket that's 0.5mm or 1mm over what your bore is.

YoungGun · 11-10-2009, 07:25 PM

^^Thanks.

Anyone know if Cosworth makes their gaskets to size, not like Apexi?

GSXRJJordan · 11-10-2009, 07:40 PM

Cosworth, like most head gasket makers, lists the actual size. So you'd want a 86.5mm or 87mm for your stock-bore SR. Since they only make 87mm and 90mm I believe, your choice is easy lol.

YoungGun · 11-10-2009, 08:07 PM

Thanks dude!

I'll have to buy you a boba or something at the 626 meet for all the help you've been giving me hahaha.

s13silvia123 · 11-10-2009, 08:48 PM

Quote:

Originally Posted by YoungGun

Thanks dude!

I'll have to buy you a boba or something at the 626 meet for all the help you've been giving me hahaha.

i might just pick up some boba during lunch tomorrow thanks making me crave

Dousan_PG · 11-10-2009, 09:03 PM

yeah that's normal
dont worry

S13 curtis · 11-11-2009, 02:07 AM

my apex HG is 87mm its 1mm over and my car runs fine.

gsracer · 11-11-2009, 06:14 AM

back when i had an sr it was the same

brian3676 · 11-11-2009, 06:51 PM

i build lots of SR's and always use cosworth there my favorite, i use 87mm every time works perfect

11-10-2009, 05:59 PM	#1
YoungGun Post Whore! Join Date: Nov 2007 Location: 818-951 SoCal Posts: 3,961 Trader Rating: (23) Feedback Score: 23 reviews	Headgasket 1mm over bore Hey bros I got a quick question for yall. I picked up a 1.1mm thick apexi headgasket 86mm stock bore, but when I picked it up the guy that was helping me said that apexi actually makes the gaskets 1mm over the bore size which would essentially make it 87mm. This is not my question, long story short i'm going to trade in this gasket for a thicker one because the machine shop had to take off a lot from the block. Would it be okay to buy a 87mm gasket from cosworth? I am using stock pistons and stock bore, if anyone has any insight please let me know thanks!

11-10-2009, 06:23 PM	#2
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	You always want a head gasket that's 0.5mm or 1mm over what your bore is. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

11-10-2009, 07:40 PM	#4
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	Cosworth, like most head gasket makers, lists the actual size. So you'd want a 86.5mm or 87mm for your stock-bore SR. Since they only make 87mm and 90mm I believe, your choice is easy lol. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

11-10-2009, 09:03 PM	#7
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 46 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	yeah that's normal dont worry __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

11-11-2009, 06:14 AM	#9
gsracer Zilvia FREAK! Join Date: Mar 2003 Location: Miami Age: 41 Posts: 1,590 Trader Rating: (7) Feedback Score: 7 reviews	back when i had an sr it was the same __________________ ANTI-STRETCH NAZI Vortech Supercharged Vh45de S14 V8nissans.com

11-10-2009, 07:25 PM	#3
YoungGun Post Whore! Join Date: Nov 2007 Location: 818-951 SoCal Posts: 3,961 Trader Rating: (23) Feedback Score: 23 reviews	^^Thanks. Anyone know if Cosworth makes their gaskets to size, not like Apexi?

11-10-2009, 08:07 PM	#5
YoungGun Post Whore! Join Date: Nov 2007 Location: 818-951 SoCal Posts: 3,961 Trader Rating: (23) Feedback Score: 23 reviews	Thanks dude! I'll have to buy you a boba or something at the 626 meet for all the help you've been giving me hahaha.

11-11-2009, 02:07 AM	#8
S13 curtis Zilvia Addict Join Date: Jun 2008 Location: Orlando,FL Age: 34 Posts: 651 Trader Rating: (13) Feedback Score: 13 reviews	my apex HG is 87mm its 1mm over and my car runs fine.

11-11-2009, 06:51 PM	#10
brian3676 Zilvia Member Join Date: Oct 2006 Location: portland Age: 37 Posts: 205 Trader Rating: (3) Feedback Score: 3 reviews	i build lots of SR's and always use cosworth there my favorite, i use 87mm every time works perfect