[MPKind]

My 455, 6X-8 heads with a RAIV cam installed 4 degrees adv. (Crane 969681) that sat for a decade after initial break in session popped a rocker stud (stock Pontiac) on 5E and buckled the 5I pushrod (Comp Cams #7851 - 9.146"). Both lifters (Comp Cams Hi Energy #852) from #5 popped out and that's that. This occurred recently while test and tune at idle. Rockers are Comp Cams RP1451 roller tip. Already upgraded the studs to 7/16".

The good news is, nothing major broke, the bad news is I discovered 5 of 16 lifter plungers are stuck (3 up and 2 down). I could replace them with the same lifter, which is about the cheapest aftermarket one sold on Summit, or I can upgrade. I think if 5 of 16 went punk it's not worth piecing it back, might as well replace all of them.

Lots of reviews and opinions about various leak down lifters, I could use some help in making a choice. The car is a '65 Cat with a 2.56 Muncie and 3.42 rear gear. Originally dyno'd at 400 hp and 500 ft-lbs, about 9.25 C.R.