70GS455
Jun 17th, 04, 9:24 AM
Has anyone run a Lunati hydraulic (the older legacy stuff, not UD's new profiles) and had a problem with it not being able to rev or breaking stuff? The reason I ask is I saw a web page on dyno tests where they experienced lifter "crash" (never heard of this before). They attributed it to the very fast ramps of the Lunati lobes, and it doesn't sound like it's a case of the lifter simply not following the profile. They also discuss a couple of cases where it broke valvetrain parts on a BBB.
http://www.trishieldperf.com/cam_dyno_tests.htm
Pat Kelley
Jun 17th, 04, 11:26 AM
Could you post the cam's part number or the adv and .050" durations.
70GS455
Jun 17th, 04, 3:29 PM
No part numbers, the Lunati's are available only speical order through the GS club. The "Popular Mechanics" is a 230/245 deg @0.050". The profile page lists them as 280/295 deg advertised. The Lunati 238/248 isn't listed among the profiles. The "Hemi Killer" is 241/241, again not listed, must be a special grind. The "Straightline Performance" is a Comp XE, not a Lunati, but a fast ramp design.
Tunedup
Jun 17th, 04, 3:43 PM
Im running a lunati special puprose cam with 280 adv and 230@050. Works great in my 383 Plenty of power from 2500-6500. Ran 14.07 @110.9 mph with a 2.56 non-posi rear end. in a 3600lb car.
70GS455
Jun 19th, 04, 2:42 PM
I think another part of the equation is that the BBC valvetrain with it's rocker stud, is much stronger in tension that the BBB rocker shaft is in shear. So it's easier to break the BBB valvetrain.