Originally Posted by staleg
What I find special about them is the fact that they are said to fit the Vortec heads without modification, AND allow lift up to .550"...
Why did Crane cams make the special tool to grind down the diameter on the Vortec head valve boss, if we could achieve the same by using an ordinary spring without the modification?
But I agree with you about "mystery" springs. If this is just an ordinary spring, how do I find the Crane or Comp version of it?
Crane was not the first to make that tool, is not the only one to make that tool, and that tool was NOT developed for Vortec heads- its just a guide cutter something that has been around for ages.
I would have the guides cut so you can run a decent spring and retainer rather than trying to wiggle around with a bunch of ebay crap so it barely fits. The springs they sell are nothing fancy at all, the only unique thing is the retainer that has .060" cut off the bottom. What bothers me is that the springs are not beehive and have no damper. You could accomplish the same thing with some "z28 springs", and a little ground off the retainers, and removing the dampers (which a lot of people do run).
The other option is to do it the right way and have the guides cut... It'll probably only cost like $50 to have them cut.
Something as critical as springs is not the place to ghetto rig it IMO, especially for a roller cam. If it was a mild hydraulic flat tappet then I'd say run the Z28 springs, but do the job right for a roller cam.