You have to use a solid lifter, if not the hydro lifter push rod seat will compress as the lobe of the cam comes up, the valve wont start to open until the push rod seat bottoms out in the lifter, the solid lifter set with 0 lash starts opening the valve as soon as the cam lobe starts lifting the lifter. This has nothing to do with the installed spring height, this is to check for the actual lift at the valve.
Last edited by csk; 04/13/1705:47 AM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
