i am purchasing a replacement block for my 87 GN from some guy down in Florida.. here is a pic he send me of the valley casting... holes on the casting ? was this modified for better oil flow for the lifters and cam? need input ASAP. thanks
84-85 block, that is how they came from the factory. As posted above it will need a hole drilled and tapped for the oil return. It also has a taller deck height.