i have just used one, they are a solid piece of copper, you use 1 headgasket of any type you like, the decomp plate is sealed to the block with some stuff he gives ya, it certainly aint the cheap way either as the decomp plate was 135quid, mick rogers etc use them so they must be shit seeing as how his is so slow and dont work properly with his 10 sec 1/4 miles, because its copper it gives where the rings etc are and seals to the block 100% perfect every time providin its done correctly 'APPARENTLY!'
i will let you know how i get on but mike from ferriday knows his stuff and reckons he has zero probs with them and they work perfect, has anyone heard anything to the contrary or is it just codswallop and chinese whispers