Upgrading Camshaft...Comp Vs Lunati

[musclecarmatt]

Hey guys....its about that time of year to start doing some winter upgrades to my car for upcoming pro-touring season...and one of items on the list is to upgrade my camshaft....... my current cam is comp cam magnum 270...The car runs pretty well but feels like there more left on the table if i bumped up the camshaft with little more duration and lift..looking for cam that has good crisp throttle response with power to bite off the corners........i emailed comp cams and they reccomended the XE274.....but i have been looking at the Voodoo 268 cam as well....i'm leaning toward the voodoo cam 268 because from the specs looks like a powerful street/autox cam...then the XE274 is good bump up in duration and lift with good mid-range and crisp power from what i was told.....anybody running these 2 cams?...and what you guys thoughts?.....here my specs:

357 SBC
9:8:1 Compression
Factory Dished Pistons(w/.015 Felpro 1094 Head Gaskets for compression)
GM Vortec "906" heads 1.94/1.50 valves,GM Hot Cam Valve Springs/Retainers(Fully Ported Intake and Exhaust,3-angle valve job)
Comp Cam Magnum Pushrods(Stock Length)
Edelbrock Performer RPM Air-Gap Intake
Holley/Quickfuel Street Hp 650cfm w/750 baseplate(Custom Tuned)
Full Roller Rockers 1.50 Ratio
1 5/8 Full Length Headers w/ x-pipe/Borla Xr-1 Race Mufflers
TH350
Custom Built 2600 Stall Converter
3.42 Rear Gears

Current Camshaft:



Comp Cam Magnum 270 Hydraulic
Duration:270/270
[email protected]: 224/224
Valve Lift: .470/.470
Lobe Lift: .313/.313
Intake CL:106 degrees
Lobe Separation:110 degrees

Voodoo 268:
•Advertised Duration (Int/Exh): 268/276
•Duration @ .050 (Int/Exh): 227/233
•Gross Valve Lift (Int/Exh): .489/.504
•LSA/ICL: 110/106
•Valve Lash (Int/Exh): Hyd/Hyd
•RPM Range: 1800-6200

XE274:
274/286 advertised duration
230/235 duration @.050
.490/.490 lift w/1.5 rocker
110LSA

[sam 74]

IMO the Lunati cam is your best choice of the 2 listed.

[Johnny Blaze]

I hear a lot of guys esp on the chevelle forum talk about how great the Voodoo cams are and the guy that designed them ,that since left Lunati.

That said, when I run a comp spec cam through Desktop Dyno Vs a Lunati spec cam, the Comp always comes out on top. Of course Comp is who puts out desktop dyno software!

The spacs you posted are real close, of course they don't show how aggresive the ramps are and such, which is supposedly where the Voodoo's really shine.

[musclecarmatt]

yea its a close battle....looking into the retro-fit roller cams as well....

[5spd540]

Rollers are a lot better for smooth power

[musclecarmatt]

yes....the retro roller lifters are around $480.....cam around $300...over $1000 invested vs.....another good flat tappet grind for way less....but isnt solid rollers cheaper but i dont think they retro-fit those...

[Johnny Blaze]

YEs they do make solid rollers for pre roller blocks, though most don't recommend them for a street car.

Rollers do equal more power, but like you said it comes at a cost. Thats why all my builds these days start with 87 or newer blocks,you can get into a roller a lot cheaper then.

[musclecarmatt]

I'm looking into the Howard's retro-fit rollers.....i got the GM hot cam kit in my vortecs to handle up to .525 lift...this cam i'm looking at has Mild choppy idle, strong torque curve. Likes good intake & exhaust, 2500+ stall right at .525 lift on both sides


http://www.summitracing.com/parts/hrs-110885-08

[TheJDMan]

You might want to take a look at this article on 4 pattern cams from Comp Cams. I installed an Edlebrock retrofit hydraulic roller in my SBC and I can tell you that the roller is very nice in that you don't have to spend 30 minutes running in the cam and you don't have to worry about the reduced ZDDT in the oil. If I had it to do over I would go with the Comp Cams 4 pattern retrofit hydraulic roller. I am currently preping a 350 four bolt main block to replace my current 327 and I plan to run the 4 pattern roller cam in the new engine.

http://www.enginelabs.com/engine-tec...ar-technology/