As of last year cosmetic didn't offer a multi layer head gasket.
I tired a copper head gasket from hussey before they went out of business and i wasnt happy with it and couldnt get it to seal. I ended up useing a stock felpro with copper Oring om the head to match the fire ring on the gasket. I used arp head studs that were 220000 psi. And never lefted the head but i did shave the head .040 to true it up.
I had two motors setup this same way and both motors saw about 18 pounds of boost.
In my opinion to get the true potential out of a turbo slant EFI is needed number one and six cyclinder dont see enough fuel no matter what i tired when i took exhaust temp reading 2,3,4,5 always ran richer and one and six were lean.
And with efi and the injectors pointed directly at the combustion chamber you want have that problem.
I blew my first motor and melted a hole in number 1 piston after 5 back to back passes in the 1/8 mile turning the boost up on that last past to 18 psi. The car didnt go lean but i just pushed it to hard.opps
The second motor the crank got into the crank scrapers and dug a 1/16 of inch deep and about a 1 inch wide turning out of the counter weight. Im not sure if the drive line got out of balance or i bent the crank but the motor locked up on me. The car never ran better before this happend and i was doing final shake down before MOPARS AT MILAN and it knocked the wind out of my sails. I had to come long the car on the trailer when i got it home a car cover was put on it and there it sat till i decided to part it out.
It wasnt till that decision that i found the problem but i had already started saling parts. And i regret parting it out now because that could of been a easy fix but it is what it is and im moving forward now and the valiant is getting my dream power plant.
Just thought id throw out some of my experience
One more thing both motors were setup with stock internals. Tom has the k1 setup in his motor now but pushed a stock bottom end to over 25 psi of boost and Ryan has stock .030 over trw pistons and stock rods and he was pushing 25 psi plus as well..........
Aaron
