Thinking about picking this up for my '98 5.7 Vortec truck engine with a '92 Camaro TBI setup on it. Anyone running this cam? Happy with it? I was searching and didn't pull up anything on the comp# or grind number; only that many people were happy with the Xtreme line.

I am thinking this will be a nice cam, but wasn't sure if there was something that might be a little better. This is an offroad only vehicle that doesn't need to worry about emmissions. Specs of my Jeep are in the sig.

Summit Link (http://store.summitracing.com/partdetail.asp?part=CCA%2D08%2D500%2D8&N=4294908216+4294908028+4294924677+4294887637+4294 840140+4294887636+400114+115&autoview=sku)


Brand: Competition Cams
Product Line: Competition Cams Xtreme Energy Camshafts
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,000-5,000 RPM
Intake Duration at 050 inch Lift: 206
Exhaust Duration at 050 inch Lift: 212
Duration at 050 inch Lift: 206 int./212 exh.
Advertised Intake Duration: 258
Advertised Exhaust Duration: 264
Advertised Duration: 258 int./264 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.480 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.488 in.
Valve Lift with Factory Rocker Arm Ratio: 0.480 int./0.488 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer Controlled Compatible: No
Grind Number: CS XR258HR-12
Quantity: Sold individually.

Camshaft, Hydraulic Roller Tappet, Advertised Duration 258/264, Lift .480/.488, Chevy, Small Block, Each

you would probably be alright with that cam. a 114 degree lsa would be easier to tune for.... Im running the 08-305-8 which is 220/230 @.050" and .510 lift in my car, and its great. pretty high RPM for a truck though... but yeah the cam you suggest should be fine.

If I ran that cam in your application. I'd use 1.6:1 rockers arms and install it at 110 degree intake centerline, or stand it straight up (this would mean retarding it 2, or 4 degrees from the factory specs). You could just call comp and have them give you the numbers for it, and order it from Jegs to save a couple bucks.
This cam should develop enough vacuum to not worry to much about having to tune a custom chip either.

those arnt stock vortec heads are they? If they are then you are gonna have to do some machine work on the spring seats to fit bigger springs.

Good info guys, thanks for the input! :)

those arnt stock vortec heads are they? If they are then you are gonna have to do some machine work on the spring seats to fit bigger springs.

Yes, they are stock Vortec heads... are you talking about machine work to fit the 1.6's that MrWillys mentioned?

Springs? Yes, it has been said that 480 is the max for pressed in studs and stock springs. With stock springs and studs you're pushing the window with the .480 lift, let alone the increased ratio I spoke of! Thanks Weasel

no youll need to machine them for the higher lift.

no youll need to machine them for the higher lift.
So you're saying that at .480 lift it will coil bind with the stock diameter spring? You might want to check out this thread?
http://forums.corvetteforum.com/showthread.php?t=433671

the coil wont bind at .480, the top of the seal contacts the bottom of the retainer.

comp cams sells a tool to machine down the height and o.d. of the boss to put in aftermarket seals and increase distance befoer the two touch. the tool goes inside a drill and lines itself up inside the boss. it is a surprisingly easy fix.

accepting the 1.6 to 1 rockers is a not a problem either, just drill the pushrod hole out a bit.

for strait info I'd say contact comp cams direct and talk to the tech staff. I was talking to Lunati yesterday and they were very helpfull picking a cam for my 454 they went over what usage i was looking at and the equipment I was runnig and gave me specific cam I needed to run and it wasn't the one I thought.:smokin:

the coil wont bind at .480, the top of the seal contacts the bottom of the retainer.

comp cams sells a tool to machine down the height and o.d. of the boss to put in aftermarket seals and increase distance befoer the two touch. the tool goes inside a drill and lines itself up inside the boss. it is a surprisingly easy fix.

accepting the 1.6 to 1 rockers is a not a problem either, just drill the pushrod hole out a bit.


tennessee and i had a big thread about this 2 months ago. You will be past the limits of the stock valve train way before .480. If i were you I would call comp like camo said and discuss what you are doing and your setup and then just buy a whole matched kit from them. They sell a cam, lifters, springs, retainers, locks, and a double? (maybe single) timing chain all together as a kit, cant go wrong with that.

what's up weaselzz?

i finally found almost all of the tools i threw into the woods when my valve train bound and bent all my shit. i learned alot of info on cutting vortec heads during that last thread.