Snapping sound under load.

[Dick Steinkamp]

Originally Posted by forever4

Please explain

See point #3 here...

http://www.rootesparts.com/id201.htm

4th paragraph here...

http://www.automotiveu.com/SolvingOverheating.htm

the paragraph under Ignition Timing here...

http://www.speedwaymotors.com/the-to...ng-cures/28793

[Glen in Hillman MI]

Have you checked for carbon buildup in the combustion chamber yet?
Carbon buildup plus full or advanced timing plus engine under heavy load equals engine noise, especially just before you stall if you push it that far. Could this be what you're hearing?