Ideal for fast road & track day use with hydraulic camshafts.
Comparable to Stage 3 Heads from idle to 4000rpm and offer a slight advantage in torque over and above stage 3 head off idle. Computer modeled and machined and hav eproven to work well ...very well.
Bead Blasted and acid dipped, refaced -
blended valve throats, standard ports
4.6 Efi (waisted stem) In Valves
4.6 Efi (waisted stem) Ex Valves
3 angle seats
Bulleted & shortened Valve Guides
Neoprene VS seals (16)
STD valve springs - fully assembled and ready to go
20% increase in gas flow...... approx 30BHP !
*£125 surcharge per unit for non exchange units
Note for 14 Bolt Heads :
The outer row of bolts are not used as it was found that cylinder heads clamped unevenly were were prone to gasket failure. Consequently all post 1995 cylinder heads are 10 rather than the 14 bolt design.
Standard Replacement Flanged Cylinder Head Bolts
Or for Maximum Performance - ARP Cylinder Head Stud Kit