M60 m62 cam chain crankshaft sprocket.

[padi]

Hi all, I'm struggling to get the sprocket off the crankshaft that drives the cams, is there any secret? I've tried soaking it in wd40, cooling the crankshaft and still the pulley took won't start and shift it. It's the last bit on my old block before I start rebuilding the new engine. Any ideas would be really helpful!
Cheers Chris.