Join Date: May 2009
Location: Shalersville, Ohio
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Timing jumps around at idle
My motor is a newer alum head 455 combo with ill admit it, a cheaper china hei. It does has a high quality pre stretched and heat treated double roller timing chain in it. 3000 miles on the clock. Here is my issue.
When I look at the balancer with my timing light i get a few degrees of fluctuation at idle. +/- 4 degrees in either direction at complete random. Also when holding the throttle at about 3000rpm when my timing is all in it is steady but then at random ill see a quick flash of the other side of the balancer then back to steady at 32 degrees. No rhythm or reason to it just quick blips every few seconds. I do hear the motor react when it happens too.
Dizzy specs: China HEI, BOP polymer gear for my roller cam, 14 initial, 18 mechanical, vac can adds 5 degrees, 364 center plate, 139 weights, lightest gold springs from mr gasket curve kit. End play never addressed.
I have done plugs, wires, cap and rotor recently. Bought a new timing light to make sure the light was good too.
Any thoughts? Endplay? Module? Chewed dizzy gear?
You outta see her on a road course, or a quarter mile