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I switched to Morel lifters after a second bad Crower Severe duty solid roller lifter. While discussing this with a builder, he ask how close I was to coil bind. I said oh not too close, and he said you need to be within .060 to .080 or over .200. He said it had to do with oscillation of the spring and that getting near coil bind would help to better control the forces and reduce the punishment the lifter takes.

I called PAC about my springs, and they told me the true coil bind measurements, which was slightly more than that listed in the catalog. I was at about .120" from bind at 1.950" installed height. So I've ordered a set of -.050 locks so that I can get down to 1.900". That should put them at .070" from coil bind, and hopefully I won't have to replace another lifter.

Anyway, thought you might find it interesting. It's not always the parts that are the problem. Crower makes good some stuff, and at over $500 a set they should last longer than they did. Now I know why, and perhaps these $600 Morels will last even longer.

http://www.racingsprings.com/mov10kvst.asp

http://speedtalk.com/forum/viewtopic.php?t=2474&highlight=
I Port and Polish heads.
Do not use different Locks other than the Locks that came with the Retainers.

Shim to .050 works well.
IMHO no less than .030 if you really need the Seat Pressure.

I like the Howard ElectroPolished Springs.
Serious Road Racers use them because they will not break.

Dan
 

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