evilbadz

iTrader: (1)

Hi there. I have a pretty highly modded 383 in my 79 corvette, but I want more out of it. I'm not sure what #s it's putting down now, but I'd guess it's around 350 to the rear based on runs against my similarly weighted trans am.

The current setup is:

Engine:
383 obviously
Eagle 4340 forged 3.75 stroke crank
Block decked & bored .030
Eagle 57 H-beam rods
King racing bearings
Keith Black flat top 10.5 pistons
Plasma moly rings
Comp Cams Xtreme Energy Cam (XE274H-10) Lift: .480 / .490, Dur: 230 / 236, Sep: 110
Comp anti pump up lifters
Comp Cams .080 push rods
Harlam Sharp roller rockers 1.5
Trick Flow 23º aluminum heads
Edelbrock 1903 795cfm carburetor
Edelbrock Performer intake
Roll Master timing chain set
Dynagear high volume oil pump
Aluminum water pump
Carter high flow fuel pump
Summit HEI distributor
Mallory Hy-Fire IV ignition

Exhaust:
3" dual exhaust
Hooker 1-3/4" long-tube ceramic coated headers
Flowmaster mufflers

Transmission:
700R4 built for racing
Billet servo
ZPAK clutches
other stuff I can't remember :smash:
2800 stall lock-up torque converter


3.55 rear

------------------------------------

Anyway, that's it. I considered nitrous but I'm not sure how much I could safely fit on the engine. Any recommendations on that?

My compression is already too high. I can get the timing up to 14 initial/34 all in but under load (when torque converter locks up and RPMS are really low, like 1-2000 RPM) it pings sometimes.

I was told a cam with more dynamic compression could help that? I'm not sure, I'm far from an expert on engines. I found a similar setup on another webpage. He recommended an Edelbrock Victor Jr. instead of the Performer, and a higher lift cam (.510/.520 instead of my .480/.490).

Would changing to that intake and that cam increase my power? If not really, what else can I do?

Like I said I want more without increasing compression as it's too high already. I know I could go with a 12cc dish piston which would help with the compression but I would prefer to not have to change those.

Thanks in advance for the help!
-Josh

F-Body Lover

you need my TPI system to get less power loool

kenSS

iTrader: (1)

i would put a victor jr on it also. if you wouldn't mind setting/checking valve lash every now and then, i would put a solid in it. instant power with the intake and cam change.

82 camaro

1 Pocket port the heads
2 bigger cam it will also help some with the pre ign
3 bigger stall for the cam
4 dump the flow masters for magnaflows or dyno max stright thru mufflers.

RAGENZ28

iTrader: (5)

Do you want more power or to go faster with what you have?

For more power I'd do a carb and intake swap. I'm not exactly a fan of edelbrock carbs, victor jr. would be good, I had good like with a 830 annular carb on a motor like yours a buddy and I built, went low 11's on pump gas N/A.

To go faster with what you have, more gear and more stall.

ZONES89RS

iTrader: (25)

HE 288 HR cam, Performer RPM air gap, 750 holley carb, 100 hit of dope.

evilbadz

iTrader: (1)

Well I'd like to stick with a hydraulic and the heads I have now. Would going with something like the XE-284 which has a higher duration help reduce my pinging? I think my static CR right now is 11:1, which seems to be too high for the 93 octane I use.

What kind of HP gains would I be looking at if I went with a Performer RPM, XE-284 and 1.6 rockers?

And if I did that, would I need to change springs or have anything machined?

Thanks

RAGENZ28

iTrader: (5)

It shouldn't ping with 11.0-1 with 93 and aluminum heads, a bigger cam would help, What's the timing, if anything 1st step if any pinging happens is to back off the timing, also how do the plugs look?

I'd get a set of new plugs, run the car hard for a 1/4 mile and shut it off asap. Then pull over and start checking the plugs, I like them to look like a nice light coffee brown, dark or black too rich, grey or really light tan too lean, or pepper like flakes signs of detonation.

If it is pinging it either has too much timing, it is too lean or both.

Something like that I would think 34-36* would be all the timing you need, as far as jetting the carb, check the plugs like i said and if it is lean, go up front and back a couple jet sizes.

So if the timing is above 34-36* back it down to 34-36* if the timing is already at that, try going a couple sizes bigger on the jets and run the car and check the plugs, don't run it hard before you check the timing and add some bigger jets, if you know it'll ping how it is now then do the timing and jetting first then you can always fine tune the jetting and timing once you have a safe base line to run the car at.

evilbadz

iTrader: (1)

Timing is already at like 13-14 intial, 34 all in. Plugs are fine. I haven't tried changing jets because I honestly don't know how haha. I'm a computer guy, this carb stuff is still new to me. Is there a kit or something I can buy for my Edelbrock 1903 that will give me various jets and maybe a book to learn how to do it?

RAGENZ28

iTrader: (5)

I never used those carbs, I always used holley stuff so honestly I don't know.

Villain281H

iTrader: (5)

More cam, a performer rpm or victor jr intake and possibly a tad losser converter if the cam is spec'd right. Also ditch the Flowmasters for a set of Magnaflows and that will wake her up a tenth or more!

At the very least, I'd consider a chassis dyno and hook up a A/F gauge for some baseline stuff to make the best of what you already have. Little changes could yield decent improvements with just a few timing and jet tweaks.

Derek

I have a 383 making over 400 at the wheels and ran in the 10.70s in a 3300 lb car.

82 camaro

Put a holley 750 dp on it much easer to tune and find parts for.

1997bird

iTrader: (2)

I do not believe that Edlebrock has a kit for the Quadrajet replacement carbs, allthough they do sell individual jets and rods for it. http://www.edelbrock.com/automotive_...ss_q-jet.shtml