Fresh engine, wiped cam? Tick? (new pics added)
Cudafever...if the installed height on the comp springs is 1.65"...the pressure is WAY too high.
If the installed height on the comp springs is 1.75"...the pressure is still substantially higher than recommended by Lunati, but the 350 pounds on the comp springs is measured at .500" lift.. The Lunati pounds of pressure was measured at only .400" lift at the valve so the actual difference between the two springs may not be as wide as it appears.
If the installed height is 1.75", that means that the rocker geometry is now really off. The rocker will be contacting the valve .100" higher than it should...that puts the other side of the rocker (the pushrod cup) even lower, making the pushrod seem even longer...a .100" thick shim under the rocker shafts would solve that issue, I suppose.
I would never run a set of springs that were that far off of the cam specs. It's just not a good idea.
Everything needs to be checked, especially the valve installed height, spring seat and open pressure, spring bind measurement, retainer to valve seal clearance at max lift, valve to piston clearance at max lift, pushrod length and pushrod clearance to the head and gasket.
P.S. The preload should be kept on the low side to avoid any possibilities of the valve being "pumped" into the pistons! This is why they invented the "anti-pump up" lifters.
Good stuff here:
http://www.popularhotrodding.com/tech/0607phr_camshaft_basics/lifters_pushrods.html
I especially like this part, since some on this forum doubted me when I said it on another thread! Read it and weep, non-believers!!!
"Because a flat lifter can initially accelerate faster than a roller, we find that with cams under about 270 to 278 degrees of off-the-seat duration, a flat tappet can produce as much or more area under the curve. It also used to be claimed that a flat lifter design was substantially inferior to a roller lifter in the friction department. Though this was, to an extent, correct 20 years ago, we find that new super oils have eaten substantially into whatever friction reduction advantage the roller may have had over a flat lifter."
Dave, the spring pressure may be to height.....even at 1.75.......and i agree with all else said above!.................
Just wanted to keep his focused on the push rod issue, before over whelming him with the rest.
myasylum, you side the lifter depths varied.........what was the average depth in to the lifter?