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If the stock springs prevent valve float and you at keeping the stock rev limit I don't see why you would need to upgrade. That being said I am not an expert. I could think the reason most shops do it is because you are in there already and the cost to redo it would be prohibitive. How much more does the fully supertech springs add to the bottom line?
Can anyone confirm you can use the high lift with the stock pistons? I have read conflicting information. 1 place says you need custom pistons with reliefs for the valves, others say stock piston is fine.
Anyone know how the stock bottom end likes 8200rpm? It's only 1k more than stock so it's not that crazy to think you don't need a built motor to handle 8200rpms.
I would like to see a before and after dyno of a built head and cams and then adding an aftermarket intake manifold on to the head. Be interesting to see if the bang for your buck as the intake manifolds that actually work seem to go for roughly 2k.
Great thread, thanks for starting it
@fmorelli as a new owner of a spare n54 head this is right up my alley.