The comp lifters with the oil grooves are the ones that just failed...only 7 hrs on them. My previous set was the std. comp lifter which lasted about 35 hrs. You are correct in there being too much spring though, however with the roller lifter valve train I ran I needed at least 250# on the seat and 700# opening to stay away from valve float through 7000rpm. (the triple spring set-up was good through 8500) Everything you've stated about the Jesels are true, I'm just saying my buddy that ran them is his 940hp NA single carbed ford 360 small block didn't see them last any longer than a std lifter....Now we'll keep in mind he turns 10,400rpm with over 1" of lift and runs 380# on the seat. Just a little more "radical" than our boat set-ups
I made 900HP at 6600 naturally aspirated on pump gas....a pick-up of 40hp from the old cam with 10 degrees less duration at 6000. Most 500" blower motors won't make that kind of power. Lately I've been breaking some parts, now I'm just trying something else that "might" live. I know a hydralic roller set-up will work, but really hate to give up 100HP. There is no-one harder on parts than sprint car guys and these radius lifters are living in their motors so we'll see...it should be interesting.