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Having trouble '06 660. Had head decked, went from 110 psi to 180 psi and now doesn't turn over. I think healthy 660 has over 180. Anyone have a thought about what the problem may be? Top ended a year ago. Been running good till it just quit on me. Changed everything gas related, hoses as well. Also Changed most electrical stu.
 

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Manual says 163 to 210 psi with 188 standard. When you say it won't turn over, which is not very descriptive, but if it will absolutely not rotate it sounds like the valves have contacted piston and when you deck the head it retards the valve timing and changes valve opening position in the rotation, depends on how much deck cut. If it will crank slow but not enough to start it, it could be the decompression is not early enough or the decompression spring or whatever mechanism is screwed up when you put it back together.
 
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