Ok, I dont want to spend money here, just want to use parts I have for todays version of my engine. The car is my 59 El camino, with a 4 speed and 3.54 gears.(I have a Posi if I get bored) I am finishing up a 383 build, and am stuck between 2 cams, a Lunati Voodoo, Hydraulic Flat Tappet. Advertised Duration (Int/Exh): 284/292; Duration @ .050 (Int/Exh): 241/249; Gross Valve Lift (Int/Exh): .525/.546; LSA/ICL: 110/106; Or the Summit 1108,244, 254 @ .050, .510,.533 lift, 114 Lsa https://static.summitracing.com/global/images/instructions/sum-1108 cam card.pdf The sole purpose of this is to keep me happy. not to go to the strip. I have an old rochester 3 deuce, and edelbrock inline dual afb intake, and an xc8 cross ram that i would like to play with, which is why I got the 114 Lsa cam, the voodoo was free. I plan to flog this and redline it like a teenager, and have the internals for that. I have read that some multi carb intakes like wider LSA, and would like opinions on which cam to use.my 1967 datecoded lifters on.
I hope the lifters you have are performance Hyd to suit your "to flog this and redline it like a teenager" and not just stock. Where do you figure redline to be?
I'd be temped to run the Summit grind seeing you have the added cubic inches to absorb the duration. With multi carb's, the 114 LSA should make it easier to tune, theoretically it should have a better vacuum signal, which is a good thing. Comparing these two cams is kinda' like comparing apple's to orange's, IMO. A lot of variable's here.
I wouldn't run either without more rear gear ratio. Needs at least a 3:73. 4:11 would be better. But with only two choices I think the voodoo. What's the compression and cylinder heads? That 3 deuce set-up might look cool but it will choke that 383.
Try to find a cam in the 230°@50 for extended street driving, either of those cam's won't pull until 3000 rpm....
Not enough information. Heads, compression, exhaust? For everything to work right, you have to look at everything and not be limited to choosing between just 2 cams. You're bound to leave something on the table if you don't, and you won't like the results. Unless looks are more important to you than performance, nix 3 x 2.
I run a lesser Voodoo cam in my 355, a 268/276 grind. https://www.lunatipower.com/voodoo-hydraulic-flat-tappet-cam-chevrolet-small-block-268-276.html I run close to 10:1 CR, rear gears are a 3.89 and it has decent street manners.
Lunati Voodoo 284/292 adv dur 241/249 dur @ .050 .525/.546 lift Summit 1108 313/322 adv dur 244/254 dur @ .050 .508 / .533 lift That summit can is a whole lot of duration without the lift to go with it, that should have a very deep gear, big stall ( you have a 4 speed) and run from 4000-7000. Should be stable on drivetrain with "moderate lift" considering operating range. Really a strip cam where youre looking at rpm drop at gear change. I imagine it would be pretty awful on the street. As a point of reference, I ran a comp 292 for a while. 292/292 adv dur .501/.501 lift. 3500 stall 4.11 gear. Same deal, lotta duration to deal with without the benefit of higher lift. Took a lot of tuning to drive, loaded up all the time, but ran hard. Changed to a split pattern cam with a little less intake duration and more lift and ran faster. Don't recall the specs but it was in line with the lunati Voodoo.
Probably depends mostly on your tolerance for poor street manners . With the 4-speed you'll be able to compensate somewhat , but again , what are you willing to sacrifice ?
The engine was built to support the Voodoo cam. I just want advice on which will support the dual AFBs, or Rochester 2gs better
the Voodoo will work better in almost all aspects. The summit cam is for the drag strip, just like @indyjps said for keeping RPM drop to a min at gear shift. That one will bite on the street and probably be awful on plugs with street driving.
I say run it to redline and have fun with it, just don't get caught. 4.56 or 4.88 rear gear would be helpful in getting a 3600 lbs. El Camino moving.
The Pontiac tri power manifold is a different animal compared to the Edelbrock for SBC. What cylinder heads are you working with and what is the static compression ratio? There are many factors that determine a successful (fun) combination. All the components must work together to optimize performance. The engine components are no different and should be selected to work together and work with the car weight, transmission ratio's, rear gear, tire diameters, etc. A smaller cam with less duration as mentioned above is good advice with your combo.
A smaller cam is always better, and I will go there, but there is some work to be done first , challenges to be faced, all in fun. After this stage is over I will go there
I would choose the VooDoo hue do for what you're doing, plus the quality of the cam would be better with less chance of flattening a lobe.
I had a cam that big in an 11:1 377 SBC, with a 4-speed and freeway gears, when I was a kid. That was my first experience with losing my license. I might have gotten jail if the dinosaur-era radar gun went up as high as I was going. Almost did not stop in time for the road block. I was young, and made poor decisions. I am older now.
I thought I would follow up on this for anyone curious. After much searching, I took my own advice, found a cam that I liked and thought was perfect, the Summit 1107/Performer Rpm Grind, and then bought the size smaller Summit 1106, which is 234, 234 @050, .488 lift., 114 LSA.. I can add 1.6 rockers if necessary, but, will probably just leave it and enjoy it. At 50, I need to keep the 16 year old in me at bay, to a degree at least.
I’d have a copy of the 30-30 solid lifter “Duntov” with cast iron headers just so I could listen to it. A dual plane intake (no air gap) and an AFB too so I’m back in 1962. If I had to use an an Edelbrock Id remove the casts or the name on front of the carb too.