Also I still have a lot of valvetrain noise. I bought a Lisle mechanics stethoscope that really works. I ran it with the left valve cover off, again, and identified the #1 and #5 exhaust rockers as the sources. It's a sharp tinking sound, like holding a pushrod like a drumstick and tapping it on concrete. All rockers had good oil flow across them. The sound is also distinctly different than when I backed off a rocker with it running, which was more of a deep thump like a brass hammer against the cylinder head.
I reused the stock lifters off the 20k-mile 99 donor engine. My theory is the stock lifters can't handle the steep rams of the comp XE cam profile, and maybe the plungers are getting slammed and bottoming out.
Has anyone used the Comp 900 lifters for Gen 6/8.1 they recommend for the XE cams? They are only $250 for the set and they work with the stock dogbone locators.
I reused the stock lifters off the 20k-mile 99 donor engine. My theory is the stock lifters can't handle the steep rams of the comp XE cam profile, and maybe the plungers are getting slammed and bottoming out.
Has anyone used the Comp 900 lifters for Gen 6/8.1 they recommend for the XE cams? They are only $250 for the set and they work with the stock dogbone locators.
