Even Zack at 505 told me to run a solid flat tappet that they were having reliability issues with the roller lifters. This was about a year and a half ago. I went solid lifter, flat tappet and had it ground at lunati and nitrided it. one of the things I liked in the stock can was the lifter diameter, I used a comp on my first build with massive failure at 2200 miles. We know the spring tension was set too high by the head builder so not entirely a comp issue imho but prefer the larger footprint on the mopar unit. My 360 and 401 are also large diameter.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!