1g cylinder head service limits

[tkstoygsx]

Did a quick search but could not find what im looking for in the time i have available. I have a 1g Cylinder head at the machine shop getting checked out and they called me today to inform me that the head is warped and needs milled. The only downfall is that I only have about .007 left to go before reaching the service limits and its .010 out of whack .

Im looking at my options or searching for a new/replacement cylinder head, but if there is an option to use this head still then please inform me of what it may be. I thought I remembered hearing something about a certain headgasket that would make up the space that I will need but Im not sure. Any input or information will be greatly appreciated!

Thanks,
Trey

 

[tkstoygsx]

I did find this thread from about a year ago, but there really isnt any posting of if a thicker head gasket would work. Please advise!

http://www.dsmtuners.com/forums/cyl...how-measure-4g63-cylinder-head-thickness.html

 

[lilsam]

That .003 is almost next to nothing thinner then a piece of paper unless you are building a race engine then you are fine tell them to do it slap it on and run the car.

 

[My1GLaser]

The guy who wrote that is a machinist. I read it myself when deciding what to do with my cyl head.

I've had about .015-.020" total surfaced off the head I am running over the past 4 years. This is compared to a bone stock head I have in the garage, as far as I know. I was a little worried myself, but here is my logic.

I am running a Felpro Permatorque HG, which is .055" compared to the OEM composite which I believe is .041-.044" thick. That's about .011-.014" over stock thickness. Add that to the .008" service limit according to the FSM. That gives me about .019-.022" of material that can be machined off and still be within service limits.

What do u mean it only has .007" to go before it reaches service limits? Are you talking about the FSM of .008" or the AERA limit of .015"? It really sounds like you'll be fine. I wanna know how it warped .010" I was pushing coolant for months and lifting the head at 35 psi and mine was only warped .002"!

 

[tkstoygsx]

MY1GLASER - im unsure how it warped, this is the condition i picked up the engine in the parts car i purchased to help finish my talon. Supposedly the cylinder head had been worked before i bought the car and the engine was rebuilt but after getting it and tearing it apart I had my doubts. I also have a Felpro Permatorque gasket going to be installed.

Thanks for the input, I think im just going to use this current Cyl. head and just to be safe I will check clearance before assembling for good. Ill post my final measurements when I get the Cyl. head back from the machine shop.

 

[JacksonAuto]

Just for reference, according to the AERA cylinder head guide the minimum thickness is 5.1850.

 

[tkstoygsx]

Just for reference, according to the AERA cylinder head guide the minimum thickness is 5.1850.

Thank you for the input. I will personally check the height when i get it back from the machine shop later this week along with having them provide their measurements.

 

[BogusSVO]

The only HG that I am aware of that can be bout in diffrent thickness is Cometic.

But both the head and block surfaces need to be perfect for it to seal.

 

[JacksonAuto]

Further note- you don't want to use a thicker head gasket to make up for what is taken off of a block or cylinder head. Doing so increases the quench volume which increases the likelihood of detonation.

 

[tkstoygsx]

Thanks for the input fella's. Im going to just wait and see what it measures out to once I get it back before I make any further desicions. Also, I most always use a Felpro Perma-torque or Mitsu MLS head gasket!

 

[tkstoygsx]

Well it turns out that this head is going to need a valve job as well as a mill. i think my options are better if I just purchased a rebuilt cylinder head. I was going to purchase one from DSM Graveyard but after reading the reviews, I dont think this is an option.

Any of you know of a good place to buy a stock rebuilt cylinder head for a decent price?

 

[GSTurbo1]

take it to a machine shop... they should tell you. They might be able to resurface it one more time or put longer shims... my machinist said something to that extent on mine.

 

[tkstoygsx]

take it to a machine shop... they should tell you. They might be able to resurface it one more time or put longer shims... my machinist said something to that extent on mine.

yea, my machinist is the one telling me these issues. They could fix it for me but for the same price I can buy a cylinder head that wont be as close to being out of spec as mine would be. A better reman would be a wiser choice in my eyes.

 

[JacksonAuto]

The cost of a valve job and milling the head will likely be less than a remanufactured head and the quality will be better. If your machine shop is not capable, give me a call or PM me and I can get you a price.