this stealthram has been beaten to death however no one has exactly what i need to do and i want to make sure it would work.

the stealthram with 24# injectors, bbk 52mm TB, ported l98 heads (Great price), on top of a 383.
would the 52mm tb and 24 # injectors be insufficient for the 383 stealthram? i will get a chip burned and a cam to match the heads when everything else is put together.

would those heads support this combo with bigger valves (say 1.94 and 1.6) or would i greatly benefit from better heads?

what kind of power would i be looking at with various cams

thanks Guys!!!!!!

 

This has been beaten to death too...try www.stealthram.com. Someone there can surely answer your questions.

 

No - a 52mm TB (dual blade) will work fine. 24# injectors should be more than enough.

No - the heads are holding you back if they are not a very special port job. Bigger valves won't bring a subpar head up to par. If possible, get them ported and worked more! However, better heads (AFR, Trickflow, DART) will go the distance.

Two cents - thats all.

 

cool i appreciate it, thats exactly what i needed. any suggestions on a good set of heads that would flow well for this setup? im on a tight budget and was orignally going to go with a vortec tpi setup however it just wouldnt be able to keep up with this 383.

EDIT: o yea....im running with the headman 1 5/8 primary headers and a 3" exhaust with no cat. would those headers support the 383 as well?

 

yes they will keep up with your 383. I run them on my 86 Z28 on a 350, 12.5:1, 264@.050 .624 lift 106lca sollid roller cam and Dart II heads....

 

What kind of cam are you using?

24lb injectors may not be enough.

I'm using a 230/236 cam and 24 lb LT1 injectors with the HSR on a 350. I'm hitting about 93% duty cycle at high rpms (approx. 5000-6500 rpms). Best thing to do is get a data log of your car or dyno run. I'll try leaning the motor out a bit and see what happens. I'll eventually be going to 30 lb SVO's.

 

no cam yet....it will come after the engine is complete (or at least i have all other components, mainly the heads). i might be able to get them at a good deal but dont want to waste any money if possible. im looking for around 500HP at the flywheel.

 

I agree with the above posts. The key is going to be your heads. If you can swing it get something like the Trickflows that were mentioned above. The Edelbrock E-Tecs with the 200cc runners would be a good one. The AFR's of course but more money.

Like stated a 93% duty cycle on the injectors is not the best. Get something larger. The rest looks good. Allen

 

alright so it looks like some good trickflow heads, correct cam, the 52mm TB will work correct, bigger injectors (would 30 work well), and the stealthram on a 383. man this thing is gonna make some serious power!!!

hows my fuel pump gonna hold up to all of this? and will i need a different water pump or will my stocker form the 305 work?

 

yes the water pump should be fine. Im using stock 305 pump on my 383 with trickflows and just got HSR will replace superram soon. you definetly need to upgrade the fuel pump to be on the safe side. at WOT fuel presure drops if it drops too low... your in danger of leaning out your motor and bye bye motor bye bye money. .... i got 255lph pump from summit they can be had for around 130$ better to protect your investment. like we all hear all the time better safe than sorry.

 

I was under the impression that 24#s would be good... I suppose tho, I am being a little conservative. 383 cubes, a high revving intake, and the cam and heads - probably a tiny bit to much for the 24# injectors now that I rethink it.

I stand strong by that 52mm TB tho, lol. It is big enough for sure.

 

well im pretty set on gettin about 36# injectors since i will be spraying the car after the engine is finished. im still leaning towards the 58 tb but if i find a great deal on a 52 i might jump on it.

new fuel pump...check
new water pump (probably to be safe, im sure mines original 166xx miles)
now what about a new oil pump.....i need to pick up a bigger oil pan but im sure i need a higher flow pump right?

 

A standard pressure and volume pump should be fine with a fully rollerized engine. If however you want to put on a new one, which is probably a good idea with 166+ miles, I run a Melling pump. I have had good luck with Melling oil pumps for many years. You should be able to pick one up at a local auto parts store. Just make sure you get the pickup welded to the pump body with the correct height for the oil pan...

 

well i just got my 383 shortblock today and got a melling M55-A oil pump with it. the pickup it a milodon 18600 but says its only for a factory stock oil pan or a mildon 30700, 30701, or 30702. i was leaning towards this one by moroso (due to the thirdgen clearance issues) but wonder if this pickup will work?

http://www.jegs.com/cgi-bin/ncommerc...09&prmenbr=361

 

You'll want a Walbro 255 fuel pump, 30lb injectors. I run 24lb injectors on my 355 and hit max duty at like 4000rpm.

And you definatly want bigger heads. I'm still running the stock 48mm TB.

Go to GM and get this part 3848911 it's the z28 oil pressure spring. Put that in your Melling pump. The oil pressure is more than sufficiant for high rpm and it's like a tach. You give it rpm oil pressure zips right up. Very nice. Doesn't top out at like 40psi high rpm like most do.

 

well im almost dead set on a 58mm tb and at least 36# injectors. i dont wanna skimp and im sure the 52 would work but the 58 gotta be better.

any other suggestions?

 

That isn't always true. Bigger is not always better. One thing is for sure though with the 52mm you most definetely will get better throttle response!

 

 

yea i ve read that thread before however i will be building a pretty serious engine and even though gm made the 48mm on the ramjet with 502 hp i feel i can benefit from a larger one....especially with the 383. im just torn between a 52 or 58. i know the 58 will help in the topend but i might be able to get a 52 pretty cheap....if i can then i odnt know whether to go for it or not. i dont wanna not skimp on the rest of the engine then come to find out a 58 would give me 15 more horses or something

 

I would just get the 58mm and be done with it. But only after you get your heads, cam and intake. Throttle response is not an issue if you can burn your own chips and everything else is setup correct.

As for the Ramjet, sure it made 500 hp with a 48mm but I'm sure it could use a bigger one. NASCAR motors make rediculous HP with restrictor plates, doesn't mean it's the ideal setup. I don't think GM would spend money to make a bigger TB, they'll just use what's already in their inventory to save $$.

 

Why would 52 give better response over 58? Its still up to the driver as to how far open the blades go reguardless of size.... Which isn't THAT big of a difference.

 

It has to do with velocity of the air coming in. the smaller the hole the higher the velocity will be for air to enter the throttlebody thus causes better throttle response. higher velocity doesnt mean more air will go in. Its like a bottleneck when ur trying to ram all that air in it makes more velocity. huh let me think let say u are vacuuming the car out if the end of the hose for the vacuum had a large opening it wont suck as good as a smaller opening will. hope this made some sense. I suck at explaining things. later

 

I know how velocity increases through a smaller hole. I'm just saying that for general driving where throttle response would be.... the opening isn't going to be any bigger.

 

have u seen the opening on a 48 or 52 or 58 there is a noticable size difference by looking at it. I have personally had a 58 on a set up that I had before. and then switched back to the 48 just to see what it d do. It made a big difference in the throttle response so I kept the 48 on there. Do me a favor see if u can't buy a 58mm or borrow one and switch it out. I garantee you will feel the difference with the pedals and seat of the pants feel. GARANTEED!

 

Are you sure you understand what throttle responce is? It has nothing to do with the driver, or how hard or fast he pushes the throttle. Its how quickly the motor responds, when you hit the throttle.

 

well in stead of running 220cc heads like i had planned ill try and save some low end torque by sticking with 200cc runners and then get a cam to match. i guess i see what you are talking about when you say it increases throttle response but then when i really think about it i just dont see how.........i think ill try to find a 58 but like i said if a 52 hits me in the face i wont turn it down. :lala:

 

well then we gotta hope a 52 hits you in the face! lol whatever size u do get and when the motor is done swap them out with the stock 48 and post your findings on here to enlighten us. Thanks!

 

i defenitly will for sure. since ill have one that will work i might even hold out on a tb to save a little money until i find one practically free but nonetheless ill surely have the 48 on there sometime and let everyone know

 

just a little update, still have the shortblock on the engine stand in my gargae. ive got my trickflow 23's being shipped to me as we speak. and for that TB thing...well im just putting my 48 on there when i get everything done. then ill just keep my eye out for a 58. but if i get the results i want from the 48 (450 flywheel hp) then im not going to mess with it. this is costing enough already.

but i think this engines getting put on hold since im looking into a c4 brake upgrade, finally i can lock up my brakes!!!!!!!!


EDIT: could someone send me a link for a good place to get the walbro 255?

 

If you plan on having 500 hp you will HAVE TO get the 36# injectors. Anything else is too small. At 500 hp you need a 34# to stay at 80% duty cycle.

 

o man dont tell me that!! lol, im gettin so many responses to that injector question my heads gonna blow up. i want 450 flywheel hp and then a 150 shot. i think the 450 flywheel with my combo is perfectly in reach and the 150 shot is defenitly going on. ive heard a ton of people telling me that 30# would be plenty for this combo but ive also heard i need the 36's. are you pretty sure i need 36's for this engine? if anyone else has any input please add it!!!

 

How is this. I just installed my commander 950 setup. Using a map close to my setup (bigger throttle body, smaller cam), ====
355 small block Chevy, 30 lb/hr injectors, StealthRam intake, 58mm throttle body, 20 degree Holley heads, Lunati 30142 cam (235/245 @ .050, .507/.534, 112 LC), 9.5:1 compression, 43 PSI fuel pressure, 418 HP @ 5500 RPM, 422 ft/lbs @ 4700 RPM.

The map tapers off after 5500... my cam will pull higher, when I added the needed fuel at 6500rpm I am static with Ford SVO 30lbers at 41PSI. Fords are rated at a lower pressure so at 41psi they are like 31-32lb/hr.

You will definatly need a fuel pump like a walbro to keep up with the fueling demands when you add the n20.


This is with a 355..... so youre 383, you do the math. Blast the fuel pressure with a good pump, or get bigger injectors and have plenty PSI left for the n20.

 

i used the holley 52mm tb and accel 24# injectors set to 55 psi and did just fine on my 383. click the blue banner to see all i used.