OK so I want to get some things straight on my car..I started having the overheat issues as well...nismo thermostat and went through all the "purging" bs...so i bought the radiator funnel and continued to purge it after it puked coolant out of the overflow bottle..
I REMOVED my thermostat and the car runs about 190-205 degrees depending if its open road or traffic in 100 degree heat.
So I cannot tell you what causes this overflow issue...I havn't lost ANY coolant but about every 2-3 weeks I will notice my overflow bottle is getting full and I will use the radiator funnel and pour it back into the radiator..

I have to say that I think its IMPOSSIBLE to run FI on a stock radiator...my wife's chiuhuahua's wiener is thicker than the stock rad..so i got a koyo 53MM..I DO NOT have ANY more overheat issues after the koyo install and the thermostat removal..

SO if a few folks here are CONVINCED that this overheat issue is automatically blown headgaskets..then why the hell am I not LOSING coolant? or I should say WASN"T losing coolant?

I am NOT convinced that this issue is automatically the HG's, but I will also say I dont know EXACTLY what the cause is either..

The engine builders here should know....i would like to see the OP's car torn down and pics of the HG's posted here...when and if that will happen is beyond my control...
Tom

 

True, and I am hoping that it turns out to be the cooling system.

I have full confidence in Sharif and know that he runs a very ethical shop. I praying for an excellent compression and leakdown test.

 

ummmm, you do know overheating the engine is a common cause for head gasket failure right?

Sorry bro, wish you only needed a radiator upgrade, but I highly doubt it.

-George

 

any update?

 

Compression and leadown were satisfactory. Pressure testing of the cooling system revealed the issue. A loose/bad gasket at the cylinder head coolant return pipe. This caused a leak, and then overheat.

Craig is the luckiest dog out there...no rebuild needed.

 

sweet that is luck

 

You should definately show everyone what was referred to as the bird's nest that was my engine bay. Around 25-50 feet of vacuum line!

The day I get my Z back, I am buying a ticket for the mega millions!

 

Unbelievable. One in a million right there. Congrats Craig

 

Oh and it goes without saying, but its worth saying anyway:

Forged is inevitably one of the most ethical business that I have ever dealt with, it would have been awfully easy to say,your engine is toast and just rebuilt the engine without running the necessary tests.

Can't wait to see the final numbers

 

^^^ in for the numbers myself. Hey they even lightened up your Z a bit by getting rid of the megamaze of lines you had in the car lol.

 

yes, luck in it being a simple issue and luckier in having a trustworthy shop to deal with

 

I went a little overboard on the rehab extras, but at least the car will be awesome.

 

Did you pick the mess up! You aren't kidding about lightening up the car, lol

 

U must be at Forged.. I hate u..

Forged is the shizznit!! Sharif's integrity is above all.....

 

Yeah man Sharif handed it to me when I was there a week ago getting an oil change. I was like wtf is this?

 

Making the world a better place. . .one hater at a time.

 

Ok so I am going to do the three same things as soon as I get time..

Right now my dually is in the shop getting a new motor etc etc etc Bill is about $9600.00

two days later my skid steer I use in my construction business craps the bed..two new hydraulic drive motors needed..cost $8450.00 for parts plus labor...

Great news though..glad to hear it..
Tom

 

I would rather spend $350 on a leakdown test from Forged than a rebuild any day of the week!

I wish you the same luck on your car. On a side note, when it rains it pours, doesn't it?

I will post pics and maybe a video or two, when the car is completed. Maybe Sharif could get a video on the dyno

 

Lucky dog! Glad to see it was nothing requiring a new block. What was the cause of the HG failure?

 

No HG failure at all, no headlift. Just a coolant leak and several miles of extra vacuum line.

I am just upgrading to FCON and a few other goodies