Z_Maggio

"O" ring the block

Forcedfed Z...One more thing.When hot (1220+)exhaust gases leak into the cooling system,the temp will spike very quickly.I suggest a Nissan head gasket and ARP head studs and make real sure the two surfaces are flat and clean before assembly. Bob

Forcedfed Z...With that nuch power,you must be running pretty high boost.You may be lifting the head off the block.Are you running head bolts or studs?To pressurize the cooling system,compression has to be "leaking"into the cooling system.That can only be a bad gasket,crack in the block or head. Maybe I'm just a lucky guy but I roadraced a 2.8na(300hp)12.8 to 1 compression ratio with none of these problems described here.In road racing,the races were 30-45 min and I routinely shifted at 7800-8000rpm.I also had a z car shop in New Orleans for 25 years.Maybe I'll learn something new here.Thanks,Bob