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#11 (permalink)

07-08-2016, 05:02 PM

Texasdoc

CC Member

Join Date: Feb 2012

Location: Keller, TX

Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq

Posts: 549

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Quote:

Originally Posted by olddog

I have not read all of this thread. Skimming back, it looks like you tried a different (Known good distributor). If you have ruled out all of the ignition parts and are stumped, pull the valve covers and check your valve springs carefully. I have seen broken valve springs cause what you would swear is an ignition miss.

One thought previously mentioned was a failing spring causing valve float. I've looked at the springs, even rolled the motor over a few times with the starter while the valve covers were off. I have a spring compressor coming from summit so I can disassemble the valve train to closer inspect the springs. Will a damaged but not broken spring be readily apparent or is there an easy way to test them?

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