taking engine apart ?

fonz87

89 Turbo!!!!
Nov 17, 2007
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Streamwood, IL
i m going to be doing a 1.2 mm HKS metal headgasket it. I m not sure what you guys are saying when decking it out the head and block ??
Right now im trying to just replace the stock hg and put a metal hg and arp bolts and just drive it till summer is over and then i m planning to rebuild my engine over the winter.
Max boost ill probably want to hit is stock 8lbs nothing more.. Thats it.. as it is, im scared to even push the car cuz it's too much boost to handle right now for me:),
So can i just replace the stock hg and replace it with mhg ??? without problems ?? or doing any work ??
 

suprahabsfan

Boost Addict
Sep 28, 2007
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Sylvania, OH
-=Fonz=-;1015451 said:
i m going to be doing a 1.2 mm HKS metal headgasket it. I m not sure what you guys are saying when decking it out the head and block ??
Right now im trying to just replace the stock hg and put a metal hg and arp bolts and just drive it till summer is over and then i m planning to rebuild my engine over the winter.
Max boost ill probably want to hit is stock 8lbs nothing more.. Thats it.. as it is, im scared to even push the car cuz it's too much boost to handle right now for me:),
So can i just replace the stock hg and replace it with mhg ??? without problems ?? or doing any work ??

Yes... you CAN do it, but I would at least take the head to a shop and have them check the clearances of the head. Or just have it decked/milled just to make sure. Why take the chance, this isn't a piddly 5 hour job, your gonna put a lot of work into doing this, and imagine if the problem doesnt go away after you put all those hours into fixing it! :cry: A completely flat surface is vital for a MHG because they don't fill small gaps like other HG's.
 

HommerSimpson

New Member
Dec 31, 2007
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New Smyrna Beach Florida
-=Fonz=-;1015451 said:
i m going to be doing a 1.2 mm HKS metal headgasket it. I m not sure what you guys are saying when decking it out the head and block ??
Right now im trying to just replace the stock hg and put a metal hg and arp bolts and just drive it till summer is over and then i m planning to rebuild my engine over the winter.
Max boost ill probably want to hit is stock 8lbs nothing more.. Thats it.. as it is, im scared to even push the car cuz it's too much boost to handle right now for me:),
So can i just replace the stock hg and replace it with mhg ??? without problems ?? or doing any work ??

Decking block = resurface as in take block out.... take ALL apart ....take to machine shop ... with head....

Now if you are not going to do the block and head and just slap a gasket on there.. you have 3 ways... 1 mhg and it will prob not seal and leak because you didnt surface block and head.. or 2 stopper mhg = 335 bucks and it will work alot better with no machine work but recomended you still have machine work done to block and head... or a good OEM grafite gasket and that will be cheapest and work best.... + arp studs no matter what way you go..... Now this is just my opinun... I spend hrs every day and hrs every night reading on here... And i learn the hard way alot... so do what you want...but at this point i think oem gasket going to be best for you... and you STILL HAVE TO CHECK the head and block for straitness... if head is warped or block or both... it wont last long.. few thousand miles if you lucky....
 

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
SM Expert
Feb 10, 2006
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Valley of the Sun
OK...one more time and this applies to any MHG, including a HKS Stopper:

jdub;1015245 said:
It's not a lie. Every manufacturer of MHG's publish a RA spec for their product...why do they do that? The smoothness of the mating surfaces is critical for the viton coating to seal. The difference in expansion rates between the iron block and aluminum head produces a "scrubbing" effect the ridgid MHG can't tolerate well...the smoother the mating surfaces, the better it minimizes this.

Guys do get away with not doing the block...it's a crap shoot if the block deck is smooth enough. Most I've seen end up redoing the job. IMO, If you can't deck both the head and block, you're better off with a stock composite HG.

The block and head sealing surfaces MUST be flat for ANY head gasket to seal.

If your max boost is going to be 8 psi, I would go with a OEM composite HG. If you buy the complete head gasket kit (FelPro or Toyota), it will come with all the gaskets, seals, and O-rings you will need. I would spend the extra $$$ on ARP studs...torque to the ARP spec sheet that comes with them.
 

suprahabsfan

Boost Addict
Sep 28, 2007
328
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0
Sylvania, OH
HommerSimpson;1015463 said:
Decking block = resurface as in take block out.... take ALL apart ....take to machine shop ... with head....

Now if you are not going to do the block and head and just slap a gasket on there.. you have 3 ways... 1 mhg and it will prob not seal and leak because you didnt surface block and head.. or 2 stopper mhg = 335 bucks and it will work alot better with no machine work but recomended you still have machine work done to block and head... or a good OEM grafite gasket and that will be cheapest and work best.... + arp studs no matter what way you go..... Now this is just my opinun... I spend hrs every day and hrs every night reading on here... And i learn the hard way alot... so do what you want...but at this point i think oem gasket going to be best for you... and you STILL HAVE TO CHECK the head and block for straitness... if head is warped or block or both... it wont last long.. few thousand miles if you lucky....

It will work better as in it will have less of a chance of blowing under high boost...When installed properly...ie block completely flat. IT WILL NOT SEAL ANY BETTER THEN A BEAD TYPE.
 

fonz87

89 Turbo!!!!
Nov 17, 2007
642
0
16
37
Streamwood, IL
jdub;1015477 said:
OK...one more time and this applies to any MHG, including a HKS Stopper:



The block and head sealing surfaces MUST be flat for ANY head gasket to seal.

If your max boost is going to be 8 psi, I would go with a OEM composite HG. If you buy the complete head gasket kit (FelPro or Toyota), it will come with all the gaskets, seals, and O-rings you will need. I would spend the extra $$$ on ARP studs...torque to the ARP spec sheet that comes with them.

I think i might just do that. Get the car running properly and have no problems. Ill do major mods next year.
 

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
SM Expert
Feb 10, 2006
10,730
1
38
Valley of the Sun
suprahabsfan;1015579 said:
It will work better as in it will have less of a chance of blowing under high boost...When installed properly...ie block completely flat. IT WILL NOT SEAL ANY BETTER THEN A BEAD TYPE.

Actually...the HKS stopper is the ultimate MHG. It provides the best seal/insurance against high HP abuse. It does require proper head/block deck prep and needs to be installed properly...this MHG requires a surface RA 30.

MHG differences