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http://i289.photobucket.com/albums/ll208/sylquebec/P1030238.jpg I don't think those ridges are ok for the head gasket. Stock yes, MHG no. That is from the cutting wheel being pulled across too fast, and is probably adjustable. Speed wise. If our resident machinist/engine builder extrodinaire...

You can definetively diagnose by checking with a scope at the sensor itself. You can just tap on the block. If you are good, then recheck that same signal at the ECU. No signal, bad wiring.

So, is it really the heater core hose off the union bolt?

Use the 4.30 from the 7MGE. I had four naturaly aspirated models. 3 of the 4 were LSD, none were the sport option. I know he asked that question 5 years ago. Somebody else may wonder. http://www.cygnusx1.net/Supra/Library/EPC/291220/catalog.aspx?F=4101&P=1...

The engine timing is probably off. Meaning teeth on the CPS.

A temp guage in a store like Autzone or CSK should carry it. Or the grocery store. You also need a manifold gauge to see why the pressures are not correct. There is a direct correlation to temperature and pressures. For example, if you know the fan doesn't operate in front of the condensor, you...

It will spool slower and have less total power than a modern single.

If you have removed a certain amount of material from the head to make it flat, you run the risk of warpage. Keep that in mind. And use the full thickness gasket to maintain compression ratio.

Then it is extremely unlikely you are putting a large volume of coolant in the combustion chamber. Did you pour coolant in your exhast upstream from the cat? I didn't think so. HC fuel unburned can also appear white. It is only black after partial burn.

Is the elevated air pressure supposed to break off a cam lobe? I don't know what that means.

Do you have a definitive misfire?

A leak. Pressure is constant in an enclosed system. A leak will drop the pressure. Your other choice is you don't have enough coolant.

The OEM gasket is a composite, not rubber. It is difficult to see what the gasket is when installed. A mirror at the RR corner of the engine, looking up at the head might show you something. Side of the car is always from the driver perspective. So right rear is the back side on the passenger...

I added to your statement. :) That is likely the problem, based on the rest of your statements. There is coolant lines at the back of the engine, including a union bolt on the back of the head in the middle. It gets a copper crush gasket on top and bottom. Did you install new...

If you were pumping that much coolant in the combustion chamber, you would have a definitive misfire.

In one of the older Toyota textbooks, it actually lists a few hz specs. I don't have it in front of me.

If you don't need it down the road, let me know. Don't dump it from a plane with your Supra. What is the 608? Aircraft?

Champion (Jay Marks) lists it at $77. And yes, you would wait for shipping. I buy parts local myself, but try and keep track of pricing if you can. Especially with this car.

But dropping a fuel tank full of fuel is fun.