Demonic85

I have a Comp Cam with a .520" lift, is this too much for an L98? I have magnaflow heads with upgraded valve springs that are rated at either .550 or .600 i'll have to check. I dont want it to sound like i've got a race car but a little choppy is nice. I have no idea what this cam would sound like.

Also my goal is to get to about 300 RWHP and keep the TPI.

BTW here are the stats on that cam...

Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-6,000
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 231
Duration at 050 inch Lift: 224 int./231 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 280
Advertised Duration: 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.520 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.515 in.
Valve Lift with Factory Rocker Arm Ratio: 0.520 int./0.515 exh. lift
Lobe Separation (degrees): 113

hobby0002000

If you have 600 lift springs and enough piston to valve clearance, install 1.6 rockers on the intake side, should sound good and not be to radical, but thats always subject to opinion.

856SPEED

getting 300rwhp with a stock TPI set up is challenging.......been there and done that.......can be done with a lot of modifications beyond heads/cam....

Demonic85

Well I already have long tube headers, dual pipes back to Magnaflows. The heads of course and fuel upgrade

MR NICE

I'm running the same cam, Comp xfi 268,but did the lt1 intake swap with heads at the same time,runs great on jackstands,waiting for a chip and the snow to stop,then i'll have a better idea,the cam does not seem too radical IMO, also I think those specs are with 1.6 rockers.

mgbss

Mr Nice

I looked this cam up on Summit and it didn't say anything about 1.6 Rockers, Comp Cams specs say with stock rockers, but there Camquest says 1.6 in its notes. I was wondering the same thing.

This is the Cam I am looking at for my 383 LT1 intake, build for my 85, any new info, have you gotten a tune yet?

I know the Snow hasn't left yet

Joe

Z51L9889

The CompCams XFI series of cams are designed to use 1.6:1 rockers. You may want to double check the cam part number on Comp's website to verify whether or not it is an XFI cam. Also, you should consider contacting the manufacturer of your heads to get an idea of the valve lift at which peak flow occurs. A cam with .520 lift isn't going to give you good results if you have heads that reach peak flow at .450, for example.

Also, you didn't state if your TPI is stock or upgraded. If you have a stock unported TPI, I seriously doubt you will reach your 300 rwhp goal. IMO, this cam will not be a good match for a TPI, especially if it's stock. The cam is too big for the limited rev range of a TPI.

MR NICE

I think this cam would be mild in a 383,I would ditch the TPI.I won't be getting a chip until the weather breaks,I'm a mason and work is slow right now.If it were me I would go with the next size up in your 383 and change the intake.

Curveit

I believe Jeremy is still running a 350" motor. Like was said above,the cam would probably be a bit too big for a TPI intake. It's bigger than a "Hot Cam" for instance. Hopefully the BBk intake will be out soon, at a good price.

Demonic85

Yes its still a 350 and i'm going to keep it that way. I guess I didnt state my original question well but thats what I was driving at, if it was too big of a cam for the TPI. Comp cams said it was a great cam for mild to moderately modified TPI engines.

There are 3 XFI cams for early C4's

.477/.472 (low end torque, crossfire)
.499/.493 (Low end to mid range torque, stock TPI)
.520/.515 (the one I got)

I figured the bigger the cam, the better. Still learning guys... What do you think about this one?

Lunati Voodoo
Advertised Duration : 256°/262°
Duration @ .050 IN/EX : 213°/219°
Gross Valve lift IN/EX .454''/.468''
LSA and ICL 112/108
RPM Range: 1000-5500

tpivette

i dont think that cam is too big... theres a guy on thirdgen.org running a roller XFI cam that specs out at 230/236 with much higher lift on a stock plenum/runners, edelbrock base TPI setup. car also has AFR 195 heads. made 330+rwhp

so depending on your heads and intake setup, id say use the one you have

AGENT 86

I chose door number 2

Comp cam CS XE262H-14 Lift In .464 Ex .470 Duration @50 In .218 Ex .224

Sounds nice at idle and lots of fun under 5500 rpm

cv67

Im still not clear on what heads youre using...

The 256 Voodoo will idle about like a stocker but will make excellent torque. Used that in a friends Iroc 350 build awhile back
-0 Deck
-10:1 compression ration
-Edelbrock performer heads with a little work
-Ported TPI
-Headers
-TJ Wong tune

1st and 2nd gear you can smoke the tires all day, smooth idle, passes smog with no problem. May be able to step up to a 262 as Agent said.