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GRP Engineering JZ Fire ring headgasket, Kit includes 1 x 0.047" Copper Head Gasket and 6 x 0.050" Phosphor Copper Fire Rings (3 thou crush)
If you are serious about Boosting your JZ engine this is the No1 Head sealing solution for high boost applications.
Machining of Block deck is required to receive fire ring groove, and this kit will suit standard 86mm bore size up to 87mm oversize.
Ring Information: Cut groove in block deck 92.8MM - 1.0MM WIDE - .8MM DEEP