I understand the different firing sequence between the cams but that still doesn't change what I'm saying. The firing order of the dissy must match the camshaft. The rotating assembly is the same for both motors, it's only the cam that changes the firing order.In Red, Blue and Black V8 motor heads the valve configuration was [ IN - EX - IN - EX - EX - IN - EX - IN ] causing the infamous "hot spot" in the centre of the head.
In VL Group A & VN-onward V8 heads, the valve configuration was [ IN - EX - IN - EX - IN - EX - IN - EX ]
So the cams need to be a completely different design to suit to modified valve configuration, mix 'em up and the back four cylinders will be trying to breath in through the exhaust and out through the inlet manifold!
The only time this goes to pot is if you're running Efi. If running a carbed VN 5.0 I can't see why you can't retain the factory cam so long as you keep the firing order appropriate to the cam...
Edited by LS1 Taxi, 05 July 2015 - 09:47 AM.