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ive recently put a stroker motor in my 71 chevy truck ,engine runs great and really wants to pull.i pull my vacation trailer,the engine has a ping but not on a pull .on a slight deceleration it pings,if i give it more throttle it quits or if i take my foot off the trottle it quites...timing is set at 4 btdc. any advise would be apreciated.....thanks
Sounds suspiciously like a vacuum advance unit pulling a big amount of advance when the throttle plates shut. Partially opening the throttle decreases vacuum and the advance unit pulls back to a tolerable range. Change vacuum pods on the distributor and if you wish (recommended), run an adjustable unit.
thanks for the advise on my ping problem Nitro and Denny.