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Originally Posted by Excaliber
Not just for break in but for the life of the cam I'm running the Shell Rotella in my engine (more ZDDP stuff). And yeah, it was a BIG hassle going through the break in steps, worst being reinstalling the inner valve springs after breakin period. My block IS drilled for hydraulic lifters and I STILL chose to run a flat tappet!  |
I think you mean a Solid Lifter Flat Tappet- Hydraulics are also Flat Tappet unless they are Rollers of course. Apart from the lifter gallery oiling one must remember that the hyd lifter remains in light contact with the cam lobe while on the base circle while with a solid lifter with valve lash & due to all the forces/ harmonics present in the valve train will not necessarily remain in contact with the lobe during this period, slowing or even stopping the rotation imparted to it by the cam lobe.
Yes swapping in the inner springs is a pain , but it also gives you a second chance to lok for any silly wear problems in the valve train before things get too serious- stuff like pushrod alignment etc.
Jac Mac
