heres my situation i have a 383 with aluminum heads 2.02/1.60 64cc/200cc on the intake, should be around 11:1 compression, with a 750 performer carb and a performer rpm intake currently has a melling .480/.480 230/230 @.50 110 cam now i havent dyno'd it as of yet however i hear alot of people say thats a small cam. here are the two ive been lookin at and am not quite sure which i should choose if either. i dont really feel like ripping this all apart but if i decide to go ahead and do this here is what i picked .501/.501 244/244 or .525/.525 253/253 both are @.50 and are comp cams can someone help me choose and tell me if it will really even be worth my time and $$$ to go through with this?

 

I think you need to post some more information about your combination for a good cam recommendation. I would also suggest calling a few different cam companies to see what they recommend for your application. You need to know what kind of aluminum heads(flow #'s if possible), roller or flat tappet, solid or hydraulic, gearing, weight of the car, intended usage of car(street vs strip), man or auto trans, stall speed if you have an auto, type of exhaust. You need to match the cam to to the total combination, a bigger cam won't do you any good if it isn't well matched to the rest of your parts.

It does sound like your cam is on the small side for an 11:1 383. With that small cam and 11:1 compression you will probably have detonation problems with pump gas. I'm sure you could improve performance with a different cam but you will probably need to make some other changes like steeper gears and a DP style carb. The 750 performer carb won't be very easily tuned with a larger cam and will hurt performance. For street/strip with the info given I'd go with something similar to (.500+lift and 240-248 dur@.05 110) assuming you don't mind switching to a 750dp carb and steeper gears. For more of a race or limited street use car I would go with the bigger cam but once you get into 250's in duration@.05 its harder to stay streetable(more tuning) and you would need to go with a single plane intake. sorry for the long post but hopefully that info helps

 

white85transam
DYNO your CURRENT COMBO BEFORE MAKING CHANGES!!


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your cars gearing must match the cams effective rpm range, and the cylinder head ports should be sized to match both the engine displacement and intended rpm range
the intake,compression, and header size must match the cam durration and engines rpm range.
if I was building an engine for that car Id build something similar to these combos.
ID use a manual trans or a 3000rpm stall converter
4.11 rear gears, and read those combo specs carefully,combineing the knowledge gained, remember, a NITROUS design cam can add significantly to your effective results if your intending to use nitrous!
http://victorylibrary.com/mopar/nitrous-tech-c.htm


http://www.beckracingengines.com/SiteFrameSet.html

http://www.diabolicalperformance.com/diabolical383.html

http://www.bracketmasters.com/small_...ker_383_cu.htm

http://www.jegs.com/cgi-bin/ncommerc...90&prmenbr=361



385 Cu.In.
10.5:1 cpr
GM 4 Bolt "010" Block
4.04 Forged SRP pistons -16cc
Eagle Cast 3.75" Crank
Crower 6.0" 4340 I beam rods
Crower Billet Steel ROLLER Cam 254/257 @ .050 .712 lift w/ 1.6 rockers 108* LSA installed at 104*
Jesel Shaft Rockers 1.6:1
PSI Springs 230# closed, 620# open
Super Victor Intake ported to match heads, Fel-Pro 1209
Wilson Manifolds 1.5" carb spacer
Holley HP950 Carb, 79-81 jets, .055 air bleeds all the way around
MSD Pro-Billet Distributor
Custom Stepped headers 1.75 - 1 7/8 - 2"
Iron Eagle Platinum 230cc
Heads CNC'd by M2 Racing 320cfm @ .700 333 cfm @ .800
66cc chambers
42* total timing
110 octane on dyno will run 91 on street

It's a custom billet steel ROLLER cam. Youll need to order one
282/286 adv
254/257 @ .050
.445 lift @ lobe
.712 lift w/ 1.6:1 rockers
108* LSA
104* ICL
Solid Roller



450tq 580hp

http://i5.photobucket.com/albums/y19.../finaldyno.jpg
http://i5.photobucket.com/albums/y19...nonumbers1.jpg
http://i5.photobucket.com/albums/y19...nonumbers1.jpg

http://i5.photobucket.com/albums/y19...nonumbers2.jpg
http://www.crower.com/misc/contact.shtml

 

i currently am running a t5 trans and 3.70 gears for the rear are soon to go in. it has 3:27's now. i'll just have to wait and see what i can pull out of it on the dyno i guess. oh i am also for right now using edelbrock tes headers and 3in cat back hooker exhaust with the cat punched and the a.i.r. capped off. it feels strong and it wants all the gas i can give it even while moving it has a great throttle response. i was hoping to pull at least 4 something at the flyhweel.