Manufacturer's Part Number:20-745-9
Part Type:Camshafts
Product Line:COMP Cams Xtreme Energy Camshafts
Summit Racing Part Number:CCA-20-745-9
UPC:036584082064
Cam Style:Hydraulic roller tappet
Basic Operating RPM Range:1,000-5,000
Intake Duration at 050 inch Lift:212
Exhaust Duration at 050 inch Lift:218
Duration at 050 inch Lift:212 int./218 exh.
Advertised Intake Duration:264
Advertised Exhaust Duration:270
Advertised Duration:264 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.480 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.480 in.
Valve Lift with Factory Rocker Arm Ratio:0.480 int./0.480 exh.
Lobe Separation (degrees):114
Computer-Controlled Compatible:Yes
Grind Number:CRS XR 264R-12
Valve Springs Required:Yes
Quantity:Sold individually.
Notes:May require computer modifications. Stock springs cannnot be used.



What push rods, lifters, rockers, and springs are u running?

 

6.915-6.935" pushrods
Hydraulic roller lifters
1.6" Stamped steel Rockers
.410" Valve springs

 

Are you running that set up?

 

Yes I am, with the stock cam.

 

I'd have to double check but I think that the samething I put I'n.. And some how all 16 lifters collapsed...

 

I'm almost 100% sure I posted the wrong number for the valve springs. I just have stock 5.9 stuff, my motor is original. I just wanted to track down all that info to kill time. Anyway if I remember correctly I think the stock valve springs are good for .515" of lift, so that cam with a stock valvetrain shouldn't be an issue... I am no expert by any means, and I hope you get this thing figured out.

 

I'd suggest contacting CompCams and see if they have any ideas. I have only seen hyd lifters fail individually or due to an oil failure if more than one or two fail. Did you have good oil pressure? Did you put them in dry?

 

i ended up call comp and we shimmed my stock springs to get what was needed and it working great!