Lunati Voo Doo Cam.
G'day All,
Wanted my 71 340 Demon to go faster. Couldn't afford a strip down, so I went bolt on stuff.
Did the following -
750 Holley DP
Elderbrock dual plane air gap performer inlet manifold.
Bigger cam, (see cam card below).
Doug's ceramic coated full length headers.
Will be in the near future adding Elderbrock alloy heads & MSD dist.
Opinions appreciated.
View attachment 1715195967
That’s the same cam I run in the 340 in my Duster. My set up is a ‘68 340 that’s .060”, 9.8:1 compression, eddy rpm air gap intake, 750 double pumper, Doug’s headers, and ported 308 heads flowing 264cfm @.500” in front of an 833 with 3.55 gears and 26” tall tires out back. Some observations
- the cam is noisy. Lunati’s have fast ramps, and they can make for a noisy valve train. Also, the lunati lifters aren’t great. I also use crane adjustable ductile rockers and Smith Bros push rods, and at some point I will ditch the lunati lifters
-3.55 gears with 26” tall tires is probably the minimum gearing for the cam. Even with a 3.09 1st gear it’ll lug if you’re not on the throttle quick at take off. It really wants a 3.73 or 3.91, but I can’t do the freeways around here with those gears
-there isn’t a ton of idle vacuum, so if you have power accessories you may need a reservoir. I only have about 10” of vacuum at idle, but everything is manual on my car
-above 3,000 rpm it’s a rocket ship. Below 2,000 rpm there isn’t much there. When I go T56 I’ve got 4.30’s for it, you don’t want to set up your cruise RPM much below 2,500. It won’t cruise below 2k without lugging it
Now, I’m not some engine builder or tuning master, that’s just what I’ve found with mine and I won’t claim to have the best set up. I do have a wideband on it, so it is tuned decently well because I can see the air/fuel ratio all the time. Honestly, for what I do with my car the 10200703 would probably br easier to drive. I would have to lower the compression a smidge with a thicker head gasket though if I did that, as I’m already on the verge of detonation with the 91 octane fuel here.
