Quote:
Originally Posted by Vettezuki
Most of what I have seen on lifter failure when someone bothers to analyze the mode failure and not make assumptions indicates it's a poorly matched spring rate, improperly measured push rod length, etc. His point was OE performs just fine in moderate applications when properly installed. Big cam race motor, different story.
Heads came in at 60cc and motor with stock pistons apparently 11.2:1. Which explains why especially in the summer I had to bump my gas with a little Torco or Toluene to avoid pinging. Headers and a retune might fix that problem but I'll lower it anyway so I can run commie gas without worries.
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Exactly, you are no where near an OE setup any more and skimping on valve train, as you have just learned personally is a recipe for disaster, anything more than 120lbs on a spring and you should have link bars, as well as anything over .550 lift. Like I said before "big" is relative. What makes a cam "big"? Lots of lift? Lots of duration? Don't skimp on the valve train.