MIGHTYMOUSE

iTrader: (59)

im pissed i can't race tonight, i've discovered i'm moving about a cup of coolant to the overflow during a 1 gear pull on the 'test track'

i checked the torque on the center head bolts, were tight, and i bought a new 20psi rad cap, same situation.

i have a fairly small relocated overflow and am not interested in overflowing or bursting it going down the track

i'll be sitting out tonight and replacing them with another set of stock ls2 gaskets tomorrow

i believe the tq to the studs was 80# should i stick with that or go more? stock arp replacement studs, 6.0 ls2 alum block.

i also have some copper gasket spray that i used before on cometic gaskets, think that is a good idea this time around?

any advice (other than turn it down)?

i'm running around on a set of 11.5" 17" et street slicks now and they hook up ok in 4th.

MECHAM

iTrader: (4)

too much powah!!!!!!

Turbo LS1 SS

iTrader: (7)

im movin some coolent outa the overflow after hard driving. im not too worried about it, i just have to reroute the overflow cuz its not sucking back in like it should.... as long as its not goin in the engine

NemeSS

iTrader: (127)

but what is the measured bore of the stock ls2 gaskets?
and the compressed value?
also, are they MLS?

bowtieman81

iTrader: (35)

I believe I saw that arp torque specs achieve 75% of elastic bolt stretch. You can safely go more. I might try 85-90 ft-lbs.

The best way in your case (not an easy way) is to use an angle gauge to tighten your studs. You would have to do some math to get it all figured out though, unless arp can tell you.

Pro Stock John

iTrader: (34)

You're going to push some coolant into the overflow, I wonder how much Kurt thinks is okay.

MIGHTYMOUSE

iTrader: (59)

well it used to be 0 all this season up until a week ago, so at this point i think anything more than 0 is pretty significant considering i have raced the car every other friday night all season

i am afraid of it getting worse and at some point accidentally sucking some in and locking up the engine

Pro Stock John

iTrader: (34)

I'm sure Kurt would be an advocate of 1/2 inch head studs at this point. Maybe you have one of those little burn channels....

Slowhawk

iTrader: (12)

We torque them to 85ft/lbs and it seems to work.Also back the car down 2 degree's of timing.That might just save you from pulling the heads anytime soon.

MIGHTYMOUSE

iTrader: (59)

1/2" studs would be quite a bit of work at this juncture.

the timing is conservative, i will make it more conservative

think timing at peak tq is more suspect rather than peak hp?

this is my current map

http://www.fastrides.com/photos/mm/i.../original.aspx

so you guys running while coolant is being pushed aren't concerned it getting under your tires?

i could do a larger overflow but that sounds more like a band aid.

i also figure if coolant is not in the head cooling it, then i may melt/warp/crack something expensive.

nitrorocket

iTrader: (12)

What boost are you running??

stevieturbo

At what point are larger head studs actually needed, or of any benefit ?

I torqued mine to 80lbft and mine has been 100% so far. It wouldnt see the abuse that your car sees though.

TwnTrboCE

iTrader: (43)

1/2" head studs are waste. The clamping force isn't the problem the clamping area is. I usually push about a quart every pass. Even more if I hot lap it. This is with an agressive tune. If I back the timing back a couple degrees it makes a big difference. It's just one of those things you deal with and check after every pass. We have pushed water since day 1 with every head/ gasket combo. Put your overflow in the back of the car.

Pro Stock John

iTrader: (34)

...So do you run MLS gaskets or copper or ??? Mike?

...And do you run straight water?

MIGHTYMOUSE

iTrader: (59)

well i cant be moving coolant like this for a street car so ill put the gaskets on and back the timing off even more and see how long it goes until it happens again.

yes or no on the copper gasket spray to the stock ls2 gaskets?

JMBLOWNWS6

iTrader: (17)

I used cooper coat on my buddies LS2 402. It is holding fine. And I just built my new motor and we tqed them to 80 #'s

KAOS

iTrader: (5)

i used the copper coating and never moved any water. i like it, my grand father who as an auto teach for 20+ years used it on everything. i say go for it, it cant hurt

nitrorocket

iTrader: (12)

Hey Mighty, What is the difference between the ls2 and the 6.0 MLS gaskets??

red90cobra

iTrader: (36)

measured bore on an ls2 is 4.04

MIGHTYMOUSE

iTrader: (59)

nothing that i know of, believe they are one in the same, ls2 = 6.0l