positive and negative effect

[littlewickeds10]

well unfortunitly come this winter i wont be able to build a little 355 like i wanted to. people needed money and i rather help out a good friend financially rather then, build a motor and show off on the street and track while him and his family suffer. so 'im just going to drop in a so called "junkyard motor." what i mean by that is, i'm going to find a running 350 and use that. however i plan on using the lunati voodoo 60103 cam. specs are below... what would be the positive and negative effect of having this cam ground on a 108 LSA? will power range be raised up more? would it make more power as is or ground on a 108? idle characteristics wont bother me, the truck will only be driven on weekends and the s10 has manual brakes. the motor will be put in a s10 with 4.10 gears and a 3,000 stall. i was always "told" by people that naturally asperated sbc motors tend to like between 106-110...i figure a 108 would give me a more in the middle for street/strip. i noticed alot of the old isky cams are made with a 108 LSA. i do know the 60103 voodoo cam was origionalyy designed to be on a 108 LSA but was switched to a 110 for more drivavbility

Hydraulic. The most awesome 268 cam ever produced! Out-powers all others! This High Performance street cam likes 2400 RPM stall, 700 cfm carb, dual plane intake and headers. Makes un-equaled power to 6200 RPM with proper valve springs. If you're looking for a Very Strong cam with great street manners then this cam is it.
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
Includes: Cam Only

[406shark]

A wider LSA figure (112-116 degrees) moves the lobe centerlines further apart and will smooth your idle due to the decrease in overlap that it creates. The lower the figure (106-110 degrees) moves the centerlines closer and will increase bottom end power, but your idle will suffer along with it.

The higher the LSA the smoother the idle, and the greater the vacuum created. Also, the higher the LSA the flatter the power curve. The tighter the LSA the peakier the power curve.


Jeff

[spacecadet]

Pesonally I think that might be OK. I have run cams with alot tiighter LSA. The have a smaller window of performance. When they 'wake up' and hit thier power band they are "BAM" and when they leave thier power band they fall flat on its face.
That one seems like it should have pull all the way through the rpm band.

Space

[littlewickeds10]

so instead of it making power all the way to 6200 rpm's it might die off say around 5800 real quick? i'm not going to tun the motor more then 5700 rpm's, but figured a tighter LSA might give me a little bit more performance, thats why i was throwing the idea out there...if a 110 is better for performance then i'll leave it at 110

[rayL]

the only way to change the LSA is to change the valve opening and closing points which is...a different cam. That cam is a 110 but is/should be installed at 106 ICL. I would leave it alone, i promise lunati knows more about camshafts than we think we do.

[littlewickeds10]

i agree lunati does know more, but i talked to the guy that designed the voodoo cams, harold brookshire...here is the email he sent me.

All the original VooDoo test cams were ground on 108 LSA. I finally forced Lunati/Holley into some 110 and 112 LSAs for comparison purposes. The dyno tests posted comparing the VooDoo 268 to the Xtreme Energy 268 was our 108 LSA to their 110 LSA.
HOWEVER, our test engine, which we tested both our VooDoo cams and their Xtreme Energy cams, was only 9.3:1 CR. the bigger the cams got, either brand, the more the engine didn't like them. Bigger cams still made more top-end than smaller cams, but the gains became smaller and smaller.
The 60103 will work just fine in a 9.5 to 10.3:1 CR 355. It is a little big in an 8.8:1 engine.
I drove the original 108 LSA cam around Bowling Green for a week. It made enough vacuum to stop the car, but not enough to make me really comfortable with it(I was 64 at the time...). The idle was such that when I pulled into hamburger joints, they asked me to turn off the engine because of the idle sound.......
A 108 LSA would probably like a 2500 to 3000 SS converter.....

thats why i was wondering if i should have it ground on a 108, just like the origional was

[harleyboy]

dude I don't see any problems in what you are talking about.

[littlewickeds10]

well i DID NOT call lunati and ask about the voodoo cm instead the origional designer of the voodoo cams emailed me back....basically the 108 LSA would not be a good idea for me unless i i have more compression...o well..live and learn