Ive seen a few stealthram combos for 400's and 383's
what about good stealthram combos for roller 350's?

I have a zz4 clone running mid twelves with the original tpi, Yeah,yeah
I know everyone already told me it cant be done, well 1/4 mile slips dont lie!

anyway, ive bought a set of Rpm performer aluminum heads, and a holleystealthram! but i just cant see keeping the zz4 cam in with that combo, seems quite small!!!

Ive been looking at the 2003 Z06 cam with 117.5 lob sep

I want something with around 450 flywheel hp, but i dont really care for alot of duration. does anyone have any suggesstions???

I am trying to keep the operation range streetable and between 1500-6000 RPMS

open to any suggestions on the combo thanx!

 

I was running mid-high 12s with about the same combo in my car too with stock TPI so i know it can be done. I also went with a stealth combo now. My setup is a 87-95 factory roller block {350}, bored 30 over with forged steel crank, forged steel H beam rods, Mahle forged lightweight racing pistons with 1.5mm top & second ring 3mm oil low drag file to fit, Brodix IK200 heads 64cc / 2.02/160 valves 200cc intake runners, comp 08-306-8 roller cam .510/.540 lift 230/244 dur @ .050 112lsa {very nice lope but not extreme}, TPIS roller lifters, 1.5 full roller rockers, stealthram welded & ported to seal on 1206 intake gasket, BBK 58mm tb, ford svo 30lb injectors, afpr, msd dist & digital 6 plus, edelbrock tes headers, 3" flowmaster exhaust, 150 shot N.O.S. soon to be 200 shot, custom chip. This cam is nice but iam looking to go a little bigger. The guy at the Dyno said it should be around 412-425 hp. Hope this helps.

 

We had a discussion about stuff like this a year or so ago when we had the IRC server. (wish they didnt take that down, lame).

1500-6500 rpm is not really gonna happen, but 2000-5500 is possible.

Try something like 224/230, .502/.510. on 112 degrees. Should have like 3 degrees of overlap which should idle fine, and will support your 450hp goal I think.

The heads you bought are junk IMO. I have a good article from super chevy from a year or so ago when they did the "heads under 1k" test with a 355.
The trickflows were the best bang for the buck at the time.

You have a flow chart on the RPM heads? If not I can dig one up.

Whats the compression ratio? With 250ish cfm heads and 10:1 that thing should be in the high 400s, if not 500hp N/A.

I have the same cam. A little too lopey for my taste but seems healthy. With the 2.59:1 gears it was absolute CRAP, but with the 3.54:1 rear I just built it should work nice I think. (3k stall converter).

-- Joe

 

yes plenty of stock LT1 headed cars with CC306 in the 350whp range. thats just abit over 400flywheel. head swaps will allow it rev and make power to 6500rpms or so and could dyno over 400whp depending on heads.

i do like the 224/230 cams or just a tad bigger like a 227/233. thats the cam i'd run with a HSR on a hot little 355. maybe even comp's 230/236. thats as big as i'd go, as that cam will want to rev up around 6000-6300rpms or so. the smaller 224 stuff will make good power all the way up to 5800-6000rpms. good match for HSR and a 350

 

before i bought the stealthram, i was actually gonna change to more highway gears to keep my tpi in its power range, i think i'll wait till i get the head/intake swap done b4 i mess with my 342 posi!

does anyone have flowcharts on the edlebrock rpm performer offroad heads?

edlebrock performer RPM #6088, they were built with 575 max lift springs, and they have mild port matching, and the castings imperfections have been cleaned up they are 64cc angle plug heads.. heres the link to the specs..
http://www.edelbrock.com/automotive/...wnumbers2.html

they make 420 hp with the edlebrock power package, is there really any reason the heads cant make more power with a more effecient system like the stealthram?

something else, as far as powerband... the enginebuilder adger smith, http://www.adgersperf.com/
said the engine would be very reliable as long as i didnt pull it past 6500, it is a .30 over roller 350, i would like to use a cam that has a maximum power band at 5800-6000 rpms, i was told by some gearheads to run the zz4 cam but i already have it and it only pulls to 5500, i just dont think its enough cam for a stealthram, ive been looking at the 03 z06 cam,but from what some have told me, they wont work properly in an older block, anyone know about the LS style cams compatibility in the 1986-2000 roller blocks? im gopnna call comp cams and crane friday on my day off, and see what kind of cam they can come up with, i want something without outragous duration, i was blown away at the dealership a few years ago, the z06 vettes have a smooth idle as smooth as a honda!!!

 

You cannot use an LSx cam in a first or second generation SBC. Just doesn't work. Different configuration completely.

It looks like you had the factory TPI on that ZZ4 cammed SBC when you ran the mid-12s and it wouldn't pull over 5500RPM. Right?

If so, the cam was not the reason it wouldn't pull any higher - it was the TPI. Just about any after-market intake is going to flow higher than that. Granted, a wilder cam will help even more, but the larger LSA (117.5?) will steal a lot of the cam's potential. A 114 would be a lot better performance wise and still idle pretty well I would think - although I'm the first to admit that I'm no expert on cams. There are some guys on here who are tho, let's see what they say....

 

The Edelbrock RPM head is the big brother to the Performer version. It still retains a small 170cc intake port volume providing great torque down low where it’s needed. The E/I percentage is no less than 70% with much higher numbers in the low-lift areas. This head is a step up from the Performer, flowing more air, which in return will make more power on the top end.



imo i would rather run a tpi unit with some high flow runners and ported base then a stealth ram with those heads. All of your lift is made before .50, very torquey, not really designed for hp.

 

the heads i have are stamped 64cc on the ends and they are angled plug heads, i'll be running full length straight exhaust.

i want something that performs better on midrange and up higher
my big problem with the stock tpi is waaaay to much torq~!
i mean what are good runners? $400? a better flowing base?$300-500

im only running 342s! and im wound past 5 grand in 3rd b4 the end of the quartermile! the only logical way to even the car out the way it is, would be to switch to a 273 or 308 gear, to keep the rpms lower and within the torque band (idle-3500) it has too much torq for deeper gears! if i keep this stock intake, its going in my truck!!!

i think the stealthram would help broaden the power band and make it at useable rpms! i mean what good is all that torq if all it does is melt tires!

ive seen stock l98 cars with 308's walk all over lt1s with 373s from light to light,but a stock l98 doesnt spin tires thru 40 MPH!

i know there are lots of people running stealthrams on stock l98 heads! certainly the closed chamber rpm performers flow better than the l98s!

 

Like i said. Those heads are kinda junk for what he wants..

-- Joe

 

I agree. Time has passed those heads by.

 

While defnitely not a head that I've used frequently or recommend, the RPM heads are not all that bad. Here's a recent dyno shootout and they held their own.

http://www.chevyhiperformance.com/te...est/index.html

A jpeg of an excell spread sheet I made to save some reading is attached.

Their 383 with a 230/236 comp made right at the 450 you're looking for. The 350 will make similar peak power,, just up the rpm scale. I've run a 218/228 - 110 with similar heads and the stealthram. It made 330rwhp,,, which is about 413 chp. It liked to be shifted at 6400 (peaked at 5850). A larger cam will shift higher and have less bottom end. I needed more than the 3000 stall speed I had with the 218/228 cam, so if you go bigger,, you'll want more than that for sure with the HSR.

Edit: I just noticed your sig with the 61% increase on the 186 heads. That would put them around 290 cfm.

 

Those heads will not flow 290 cfm....

If you look at the rest of the dyno graphs from that head shootout, the edelbrocks were almost the worst ones there

-- Joe

 

I highly doubt the ported 186 will flow any where close to 290 - never heard of a 7-angle ramp port either. Just making a point,,,, so to speak.

Man,,, While I don't put a lot of faith in "shoot-outs" or magazine testing in general (too many variables that may or may not been properly controlled),,, I don't know how you can say they're almost the worst in the shootout when there were only three heads that made 450 horses and only two that averaged over 400,,, and the Edelbrocks were in both those groups. If I had to make a general statement based on the article,,, I'd have to say they were almost the best there (looking strictly at the power generated).

 

Id be happy to see high 400's or 500hp, iam waiting to get it into the dyno to see what it pulls. My compression is 10.6-1. With the 3.73 rear gears the *** is all over the road through 3rd gear without the NOS and iam running sticky 255-50-16 out back. My next step is to get a built TH350/400 manual valve body trany to put in along with a 9" rear so i can get rid of my weak links and run my slicks.

 

Yeah they will do much better then stock heads, since you have them might as well make the best of it. I do agree your flat spot in rpm is due to the TPI, mine fell off b4 6000. The heads you have plus the stealth should net a big increase by seat of the pants even with the zz4 cam. I called Comp b4 buying my cam and they are very helpfull in matching you up with the right combo, if it fronts a problem they will tell you right up from. Good Luck

 

Check out this company: www.lazercams.com they custom made my cam for under $300. They have a very in depth cam request form that will get you exactly what you are looking for,

 

Maybe we read two different articles? I'm gonna scan mine and post it. The article was "head tests under $1000" and the edel's were among the worst performers.

-- Joe

 

Ahhh,,, maybe it is different articles,,, click on the link I gave earlier to the on-line article I'm referencing. In this one,,, they have almost the exact curve to the trickflows tested,,, just down about 3 horses at every RPM test point. Which could be tuning differences for all we know. Or,,, the Edelbrocks could have been ringers,,,, as they flowed more on the bench the article used for testing than what was previously posted. Who knows,,, that's why I don't usually reference articles that I have no personal knowledge of. I've never recommended the Edelbrocks to anyone, although I did build a complete "Edelbrock package" engine for a guy and it seemed to make the power they claim.

On a side note, a earlier article tested the new AFR Eliminator 195 heads on the same dyno using the same cam and intake on what seems to be the same engine. Anyway,, take it for what it's worth,,, pure speculation with no proof that the 383 "mule" is the same engine.