Howdy
@Brigsy @Adey
The R8 head oil galleries differ from those in the Dini and C7K. However, this doesn’t apply in your case, as you’re using a Dini and C block. For example, the R8 head circulates oil to the rocker shafts from the centre, whereas the Dini/C7K/C directs oil flow from the end.
The only modification I made was drilling and tapping the oil gallery at the end of the block to house a stainless stud, which I drilled to 2.5mm. This helps retain oil within the engine and reduces oil transfer to the head.
I used domed pistons, so I had to pocket them for the valves due to the high lift and overlap on my cam. I also used 21mm tappets, meaning I had to machine the C block from 19mm to approximately 21mm. If you're using stock Dini pushrods, you'll be fine—there’s no need to drill the head holes to 12mm or more.
Finally, since my engine is transversely mounted (
viva la R5GTT!), oil drains are required from the head to the sump.
As always, great work - you two - on your motors'