Very special head based on our version 5 unit; The procedures included in this S5 head are as below;

– Port, polish & blend
– Modify combustion chambers & balance volumes
– Fully de-burred
– Skimmed surface
– 3 angle valve seats
– Modified for ND fire ring gasket and 12.7mm head studs

– ND valve spring kit
– ND shim set
– ND Ti retainers
– ND 1mm oversize inlet valves
– ND 2mm oversize inconnel exhaust valves
– ND bronze valve guides
– ND solid lifter camshafts (Pair)
– ND solid lifter set
– ND vernier cam pulleys (Pair)
– New high temp valve stem seals

(Suits stroker engines best) (Rated to over 1250hp+) ……..But with additional processes to cope with the rigors of 1250hp and upwards. Heavily processed by ND with proven experience from our own ND Evo 9 SWB.

We don’t want to publish the exact things we do on this unit as it has been gained by many many versions in testing.

Please call ND for further information.