Originally Posted by
Epstein
The lifters and rockers are the expensive parts. If you're getting nissan pricing on stuff, you should read what Andreas Miko says about late model SR head stuffs. There are revised rockers (not roller) with deeper bowls, and lifters with large side openings in the late (99-2000) fwd SRs. Find this stuff, and I think you could do well reselling it. Supposedly, the revised HLA stuff is good for 9k rpms. Oh and the B15 SR cam oiling rails are larger diameter to resist clogging.
SR20DET oiling rails are all larger than SR20DE oiling rails to start out, so if you have a rwd sr, you'll be fine with that.
Also, i would make sure you have a stronger oil pump if youre opening up any orifices that deal with oil flow and pressure.
the revised rockers have a bowl approx .025" deeper to prevent rocker float. so this comes into effect with your geometry of hydraulic lash adjusted cams. it can produce excessive valve guide wear.
the lifters with the large side openings simply have a .025" taller base height, as well as having a smaller hole on the top, and more surface area (less hole) on the top to distribute the weight.
the earlier lifters have small side openings and larger top openings.
oh it gets better. there's a third style of lifter with a large side opening and a large top opening, and a one piece center section that is check valved differnetly than the rest.
I have spoken to COMP cams in depth about all of my valvetrain stuff, and the responses i got were QUITE interesting.
