Head height is 115.65 mm, going to use a stock head gasket..problems?

[InFrnt0fU]

1. I have a fully refurbished cyl head that has been milled about .35mm with a RA spec of 10-20 RA ready to be bolted on. Am I going to be looking at a higher than normal compression if I'm using the toyota head gasket?

2. After removing my old head and find out that the head gasket was not blown(though some places look like there is some warpage), but coolant was in the combustion camber(some nice beads of coolant and a little pool sitting in the #6 cylinder...if my block is in good enough condition, can I put a metal head gasket on? I've heard I will be looking for trouble. Power goals are no more than 400hp.

3. Since there are no spots in the HG where it has blown, I'm guessing I was fortunate to have gone through with the rebuild since it seems it was close to a true BHG?


4. Is there a checklist in the forums, other than using the TSRM, for reassembly of the engine...just curious since the TSRM jumps all around.

Thanks guys. Any commentary related to my questions or situation is also welcome. ::dunce::

 

[silvergsx623]

You can use a metal head gasket, but first it would be best to have the block machined to make sure its level. (or u may be pulling it apart again when the HG blows).

also it would be good to invest in a set of ARP studs / bolts to hold that head on.

 

[jdub]

The TSRM has a max of .10mm for head warpage:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?S=EM&P=42

Removing .35mm to deck a head is quite a bit of material removal...either it has been decked multiple times or was warped past the above spec. I would have the cam journal ways/caps checked for warpage. If it's good, you will need a 1.6mm MHG (or slightly thicker) to keep compression at stock (the stock HG is 1.3mm compressed iirc). You can use the stock HG, but will have a bit higher compression.

If you had coolant in #6, you had a BHG
To use a MHG, you need the have the block surface decked to meet the same RA spec as the head. It's a crap shoot if it will seal otherwise. Make very sure you change the oil...coolant in the oil is a very bad thing for bearings.

I would use ARP hardware...studs if there's a choice...torque to the spec (using moly) ARP includes with the hardware. You'll need to search...take a look in the reference section. Follow the TRSM to the letter though