Hello guys long story short. N54 lift head gasket once on 17T FBO 550whp.
After that i go for build engine rods pistons , cutom exhaust manifold runing single turbo 8hp70 etc... lift head again at 600whp power range turns out that ARP heat studs pull a treath from cyl 6. New cylinder head now fully serviced drilled and tapped cyl 1 and 6 block for 11mm studs and its building pressure at cooling system at 1.8bar boost 640whp..... at low boost 1.2bar ant allot abuse its looks fine no pressure building in coolant system. For third time thinking to go back to ARP studs and athena HG. Any advice guys
After that i go for build engine rods pistons , cutom exhaust manifold runing single turbo 8hp70 etc... lift head again at 600whp power range turns out that ARP heat studs pull a treath from cyl 6. New cylinder head now fully serviced drilled and tapped cyl 1 and 6 block for 11mm studs and its building pressure at cooling system at 1.8bar boost 640whp..... at low boost 1.2bar ant allot abuse its looks fine no pressure building in coolant system. For third time thinking to go back to ARP studs and athena HG. Any advice guys