F-Body Lover

I bought a 383 from a friend it has Edelbrock E-tec 200cc heads,performer air gap,750cfm double pump holley,LT4 hot cam,copper gasket head,11:1CR,1.6 rockers the copper gasket will go and will be replaced with another thicker gasket and I want to know the perfect cam for this set up this engine will go into 92 Z28 with 700R4 with shift kit and racing clutch the converter will be decided once the cam is chosen and 3.73 with some other stuff like LT,pulleys,,etc so can I hit the 400RWHP with this set up and different cam? should I be in 11's? what do you expect the E.T will be?

AutoRoc

Lots of variables...weight of vehicle and cam specs being the biggest. With an Air Gap intake and your combo, I'd probably try a Comp XR288HR-10 236/242 duration or even the Edelbrock hyd roller that SDPC sells it's like a 234/238 duration. run them with a 1./6 rocker arm and it will have good lift. I'd couple it with a 3200-3500 stall. I think it would be in the 11's at 3400lbs and good traction. I'd probably swap to a Super Victor Vortec instead of the dual plane but either way, these Vortec pattern intakes are a bottle neck on top of those big runner heads. I've been through it and see no way around it. My guess is it's leaving 20-30 HP on the table by having a 2.6" cross section Intake-intake port runner and a 2.8-2.9 cross section cyl head intake port...Goodluck!

F-Body Lover

yeah I was thinking of that cam and that stall but the current springs on the heads can hold up to 575" and the exhaust left with 1.6 will 576" so is it ok? another thing Im concerned about the exhaust port are square and the headers is Hedman 1 5/8 circle will they work fine? or do I need to modify them? I read an article before that if switching from dual plane to single plane is only for serious high horspower so I will keep the dual plane and the vortec heads for now and I will keep looking for a set of Dart heads or Brodix they can be found easily in my country other than that the set up will be a killer with that cam right? I will be putting AGX KYB shocks and control arm's in the future so I hope .1 or .2 will be shaved from the time

bluebeast

iTrader: (1)

well i just went through something similar with a 388 stroker..... i had a better cam and only made 380rwhp the first time i went to a little dyno day and didnt have time to tune..... sinne then i found out it was running way lean and added some fuel to it and it picked up a good amount and its probly around 400rwhp now..... but a LT4 hot cam and good stall aint gonna get you 400rwhp..... if you want dyno numbers you better get a better cam or put a 5 or 6 speed iin there..... is this a street car or a car you will be drag racing from time to time and want it to perform at the track???

ZONES89RS

iTrader: (25)

I am running a 11 to 1 383 with 230 CC dart heads, my cam is 244/252 @ .050 with .565/.540 lift on a 112 LSA. The bigger heads i have and big cam make it go way over 400 RWHP, so you just need a bigger cam if i remember those heads flowing what i think they do.

F-Body Lover

the cam will be changed to 08-433-8 from COMP the LT4 will be long gone and I will stay with the 700R4 if it breaks I will go with TH-350 full manual and the car will be for drag racing from time to time but in the same time I dont mind using it daily

F-Body Lover

are you running mid 11s? I just want to hit 400RWHP and I decided to go with 236/242 520/540 on 110 LSA and 3200-3500 stall I will contact Fuddle soon about the converter

ZONES89RS

iTrader: (25)

I am running a standard trans, so with it being lighter than a auto and having less power loss thru the drive line i will make more power with a identical motor, my old 383 with the same cam you have ran 11.94 and was only 9.7 to 1 compression.

F-Body Lover

wow 11.94 with only 9.7 CR I just hope hit 11s and 400RWHP thats it btw do you suggest that I change the heads in the future or the current heads are enough?

F-Body Lover

oh yeah the reason why Im changing the heads gasket because the previous owner was using O ringed copper gasket and my friends told me that he was so stupid to run this gasket on that motor and he was using 670 vacuum holley and using the wrong port for the timing advance he even didnt adjust the timing by the timing light he just run the motor put it in D and drive like an idiot the engine was on Coupe Caprice '87 and now hes using LS1 in his Caprice