Specs look good but I'm staying away from the summit stuff. Not sure whose supplying their lifters but I've got a set that had 2 fail after couple thousand miles. Running 509" springs on Indy reman heads. Preload was dead on, spring installed height spot on, yet 2 lifters collapsed and started ticking at start up, now a buddies summit cam kit in a small block chevy lost one too using edelbrock springs in a very mild 327.
