To Suit early RV8 engines ie Cylinder Heads with the outer row of bolts.
ARP Cylinder heads when fitted to New engines ie 4.0/4.6 have been found to reduce the frequency of cylinder block liner problems. Recommended for this application with a cooler thermostat (74deg)
ARP Thread Lube Not Included but can be purchased seperately £8.95 3 fl/oz bottle
These are a must for NOx, Turbo or High Performance Engines.