383firebirdokc

I have 2 techs telling me about two different cams for my 84 trans am I am going to give you all my known specs and you guys tell me what I should be putting in this thing. first off I am looking for most power low and mid. 383 stroker 195cc trickflow heads edelbrock air gap intake holley 770cfm I am building my tranny to make it PRO BUILT 700r4 and 3.73 rear end disc posi. the cams are 1. comp cams extreme energy hydr flat tappet 268/ 280, 224/230,
lift is 477 480 COMP Cams #CL12-242-2.... #2 is lunati voodoo hyd flat tappet 276/284 233/240 lift .504/.525 LUNATI PART NUMBER #60104SK both have a lobe angle of 110. if you guys need more info on my car please ask. thanx.

sofakingdom

iTrader: (1)

They're both "good" cams. Neither is a "mistake".

For low and mid, that Comp one will work better than that Lunati one.

For all-out power, the situation might be reversed.

You also don't mention your converter. The Comp will work somewhat with the stock one. The Lunati will not really, will want about a 3000 RPM stall.

383firebirdokc

yeah my transmission guy told me a 2100 stall would be best is that about right? or would a 2400-2500 stall be better?

Orr89RocZ

iTrader: (20)

whats your compression? I like the bigger cam for more power but its gonna be more like mid to low-high rpm power...by low-high i mean 6300 rpm or so. It will be real strong in the 3800-6300 range while the other comp cam should be abit stronger within the 3000-5800 range. By 5500 or so rpm, I think the lunati will take over power and make 15 more hp or so by peak. I like its duration and higher lift for the trick flow heads. Probably only give up 15wtq in the low range over the comp, maybe not even that. Both will have strong low to mid power in a 383.

If your compression is around 11 to 1 which is the norm with 64cc heads and flattop pistons, then go with the lunati, your gonna need abit more duration to help make it more pump gas friendly.

383firebirdokc

I think last I checked I was just under 11.1 at 10.5.1 the guy I talked to about the com cam told me it would create more vacuum then the lunati and unless I dyno them both I would have no idea yanno. but it does say on the comp cam website it creates alot more vacuum then some of there other compared models. would vacuum be a factor?

Orr89RocZ

iTrader: (20)

You will have enough vacuum with either cam. I've run a cam with abit more overlap than that lunati and was just fine. I know other guys running bigger stuff with good vacuum, just give it timing and get the air fuel spot on, and it will create vacuum.

383firebirdokc

so for a setup like mine do you like the larger duration over the comp cam? I feel like anyone will work great but I would like to hit it on the head the first time then to have to switch out later because of upgrades yanno.

Orr89RocZ

iTrader: (20)

To be honest, I prefer a slightly larger cam on my motors. 383 makes torque so you can get away with alittle larger cam. Your heads/compression and intake manifold are designed to make power to 6500 rpm, so use it and cam it up to match the combination.

Most 276 deg advertised cams spec out to be around 224-228 deg duration. The voodoo has a pretty aggressive lobe shape so its getting more duration by .050" lift. I think the fast valve motion on that cam will make it act very streetable on your setup but make alot of power.

You cant go wrong on either cam, but I really think the comp cam is a touch too small for this motor. I know you want power low to mid rpm range, and that comp cam will do well. I just think your combination would like the larger cam and make more overall peak hp/tq without giving up much on the low end.

If your worried, just go to the next lunati cam the 60103LK. Its similar to the comp in a 268/276 227/233 grind with more lift than the comp at .489/.504. I'd run that with 1.6 rockers if you could and it would make a great inbetween cam compared to that comp cam and the larger lunati.

Honestly dont see much more than 10-15hp between the 3 cams...they are all in the same ball park with most power going to the 233/240 lunati and possibly most peak torque as well, just at a slightly higher rpm than the others.

All will work with a 2400-2500-ish stall.

383firebirdokc

sounds good to me I think I will go with the larger duration and lift that the lunati has I have heard nothin bad about either I just dont want to say to myself later darn i wish i went to a bigger cam lol thanx guys..

Sonix

iTrader: (1)

I've had both lunati 60103 and Comp 268XE in my 350. Unfortunately I wiped some lobes off the 60103, so I didn't get a chance to run it for long
However, on my 350, I had vacuum levels that were fine for power brakes, etc. With your cylinder heads, any of those 3 would be excellent. If this is more of a around town vehicle, it'd stick to the 60103 / comp 268XE, however if the car is going to see more time on the weekends, or at the track, then step up one. It'll be a blast either way.

Orr89RocZ

iTrader: (20)

This has been my philosophy since the last 2 motors I've built, I said to myself, man i wish I went bigger on the cam and or heads. With a good tune you will find a big cammed car can run just fine and like I said before your components will appreciate the bigger cam just fine. The voodoo lineup is a great lineup. I think you will like the bigger cam and that motor will do everything you could ask from it and more.