anyone ran this cam before?

[cfgioja]

just curious if anyone has ran this cam before. My engine build is setup for it as far as I can tell. I have it installed and the PTV clearance is good. Upgraded everything that is recommended and balanced the lower end. Comp suggested this cam for my style of driving I will be doing.

Just curious if any one has any history with it.

Comp cam 54-428-11 Grind #XR281HR
Hydraulic Roller Lifter
High RPM street strip

RPM Range 2200-7200
Timing .006
Lobe center angle 112
Intake centerline 110

Valve lash is hydraulic on both
Duration intake 281 ex 283
Duration .050" intake 228 ex 230
valve lift intake 0.571 ex 0.573
lobe lift intake .0336 ex 0.337

[blackbirdbrain89]

yes i have in in my car now and didnt even check the PTV that cam is not going to have any issues with PTV

now with 1.8 or higher rockers it make have issues but on a stock ls1 no issue

im running 918s and ive hit my rev limmiter a few times and its at 7000 rpm

[cfgioja]

Black bird, nothing on the engine is stock, the rocker arms arent 1.8 though they are 1.72. The pistons have -3 reliefs in them.

Also what other mods do you have to allow your rpm range? Valve train? bottom end?

How did you go about tuning the computer after the cam install.

One last thing I am not sure what 918s are, is that 1/4 time? I am not much of a drag racer and have never been to the strip.

[2000ls1tranz]

918s he talking bout his springs

[cfgioja]

ok those are just bee hive springs. I am running 26921 dual springs. I am trying to get a rough comparison about these engines in a chevy to what I should expect out of it for my 944.

[blackbirdbrain89]

Black bird, nothing on the engine is stock, the rocker arms arent 1.8 though they are 1.72. The pistons have -3 reliefs in them.

Also what other mods do you have to allow your rpm range? Valve train? bottom end?

How did you go about tuning the computer after the cam install.

One last thing I am not sure what 918s are, is that 1/4 time? I am not much of a drag racer and have never been to the strip.

mine is a stock short block.. and it pulls till about 6300 and i have to tuned rich up past that. the cam my pull past but i dont think my intake is going to keep up with it.

with 1.72 rockers i cant see any ptv isssue ..

hell i even run stock junk push rods

[blackbirdbrain89]

o and best so far with this cam has only been 12.4ish but i have not ran it much and not much tuneing time for it

as far as spark timming i keep my old timming tabe that is 28* till 5200 then i kicked it up to 30 * and i have zero KR