Quote:
Originally Posted by RobbyBeefcake87
The other stuff isn't really applicable towards my inquiry since I wouldn't be boosting, spinning above 7k, or getting a high lift cam above .600.... but is it confirmed that they wouldn't work with the stock cam with afm lobes?
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I could NOT get them to work and I personally tried, The AFM lobe has a special ramp profile that prevents the LS7 lifter from leaking down. So there is a issue with the valves closing due to lifter overfill. This is my thinking after trying. I have access to all different lengths of pushrods. Others may know more; I raced a Challenger before this so no beforehand knowledge on AFM.
Once again it is lift, ramp speed, and RPM that cause most failures. My specific failure added in boost and stiff springs leading to what I think was valve bounce. Ramp speed is The number 1 issue that fails the ls7 lifter for most failure IMO, hence I’d spec it only for the GM hot cam. I’d talk to Cam Motion to see if they rec the LS7 on their small sub .600 lift cam.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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