SR headgasket install - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sunnys14 · 03-22-2007, 03:55 AM

i know your supposed to get the head resurfaced when you do a head gasket install on a SR but how do you guys get the head decked while the motor is still in the car? do u just scrub with a scotch brite pad?

hayaimoto · 03-22-2007, 04:05 AM

Well "decking" the head would require precise machine work. You will need to remove the head if you want to re-surface the bottom portion of the cylinder head. Using a scrub or scotch brite pad will not do anything to the head except scar it and cause possible problems. Most people resurface heads when the motor has overheated extensively and resulted in an "un-even" warp, I would just remove the head and take it to the machine shop. Do not deck the head to much becuase it will yield a different compression ratio.

drifter808 · 03-22-2007, 04:10 AM

if you never overheated the car and warped the head just get it resufaced and for the block i just used some sandpaper and went really slow with it.

GSXRJJordan · 03-22-2007, 04:18 AM

Depending on which head gasket you're using, the block might not need much prep at all... Cometic's generally require mirror-finish type of mating surfaces, while the JDM gaskets (Apexi, Tomei, HKS, Power Enterprise) are much friendlier.

statik · 03-22-2007, 08:41 AM

Quote:

Originally Posted by GSXRJJordan

Depending on which head gasket you're using, the block might not need much prep at all... Cometic's generally require mirror-finish type of mating surfaces, while the JDM gaskets (Apexi, Tomei, HKS, Power Enterprise) are much friendlier.

Agreed, if you have no detonation on the block/head (looks like pitting) then you can usually get away with using copper gasket spray on the cometic and scotch bright+brake cleaner on the block/head, it will get it really clean.

sunnys14 · 03-22-2007, 02:12 PM

im talking about what you guys do with the BLOCK while doing a headgasket install, since its an aluminum block and all. im not gonna touch the head, the machine shop is gonna take care of it. just the block...

steve shadows · 03-22-2007, 04:28 PM

Quote:

Originally Posted by statik

Agreed, if you have no detonation on the block/head (looks like pitting) then you can usually get away with using copper gasket spray on the cometic and scotch bright+brake cleaner on the block/head, it will get it really clean.

I usually use "Gasket Remover" by permatex, + some 200 grit Sanding Pads (look like little black bircks) and some brake cleaner to wipe stuff off, then some 800 grit to finish the block surface...

Dont forget if your REPLACING the FRONT COVER there has been information relating to the front cover not being machined perfectly to mate with the block and makes the front of the head angle at a fraction of a mm in the 1st cylinder. Its ok with OEM and I think if you throw enough cpprgasket at the front cylit will be ok, but at high boost you can get head lift.

I havent had an issue with this yet on my personal car, running copper spray with Apexi hg but it is a real possiblity. Stay OEM unless you have agood tuner and are shooting for over 450whp.

OEM works just fine. wrong ecu or bad efi tuning and ghetto piggy backs kill motors , not oem hg material weaknesses.

03-22-2007, 03:55 AM	#1
sunnys14 Zilvia FREAK! Join Date: Mar 2006 Location: a land far far away... Posts: 1,549 Trader Rating: (19) Feedback Score: 19 reviews	SR block resurface i know your supposed to get the head resurfaced when you do a head gasket install on a SR but how do you guys get the head decked while the motor is still in the car? do u just scrub with a scotch brite pad?

03-22-2007, 04:05 AM	#2
hayaimoto Zilvia Junkie Join Date: Dec 2006 Location: Irvine CA Posts: 492 Trader Rating: (20) Feedback Score: 20 reviews	Well "decking" the head would require precise machine work. You will need to remove the head if you want to re-surface the bottom portion of the cylinder head. Using a scrub or scotch brite pad will not do anything to the head except scar it and cause possible problems. Most people resurface heads when the motor has overheated extensively and resulted in an "un-even" warp, I would just remove the head and take it to the machine shop. Do not deck the head to much becuase it will yield a different compression ratio. __________________

03-22-2007, 04:10 AM	#3
drifter808 Zilvia Addict Join Date: Aug 2005 Location: Big Island Age: 36 Posts: 829 Trader Rating: (4) Rides Gallery: drifter808 Feedback Score: 4 reviews	if you never overheated the car and warped the head just get it resufaced and for the block i just used some sandpaper and went really slow with it. __________________

03-22-2007, 04:18 AM	#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	Depending on which head gasket you're using, the block might not need much prep at all... Cometic's generally require mirror-finish type of mating surfaces, while the JDM gaskets (Apexi, Tomei, HKS, Power Enterprise) are much friendlier. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

03-22-2007, 02:12 PM	#6
sunnys14 Zilvia FREAK! Join Date: Mar 2006 Location: a land far far away... Posts: 1,549 Trader Rating: (19) Feedback Score: 19 reviews	im talking about what you guys do with the BLOCK while doing a headgasket install, since its an aluminum block and all. im not gonna touch the head, the machine shop is gonna take care of it. just the block...