Mr. Magoo

I'm sorry I've been in a cloud the last few months and might of missed this, is it true? I did a search and found people making their own Plenum but does Holley offer one?
If so where and how much for the complete set-up?

JCAIRE2

You have to buy the Holley setup and purchase a custom plenum from grumpyvette, or some other dude who allegedly stole GV's design for himself. :cheers:

vader86

I read in the last summit catalog that they have a new one to fit under our hoods, but havent read anything on the forum about this one.

As far as i know, you have to buy theirs and have GV make you a plenum.

Mr. Magoo

I just looked through my Summit catalog and found that too, but it looks the same as the other one? Anybody know what's so different to make it fit?

Dougs 90

Which Summit Catalog are we talking about? I cant find it in mine. That is exactly what I need a stealthrm that will fit! If it is true guess the ole car have to go down for another weekend to put it on! :D

Doug

Mr. Magoo

It's in the July-August 2003 Catalog on page 33.

scorp508

Welcome to Earth, Magoo. :D :D

JCAIRE2

I tried to find mention of it on summit, jegs and holleys websites, but no mention of a stealthram for c4's.

Dougs 90

I have looked too! I sent an email to tech support a Summit, see what they come up with I haven't seen their new catalog yet, can you scan and email me the Stealth ram deal for our cars?

Thanks,
Doug

Mr. Magoo

I'll have to scan it when I get home from work tonight. Let me know if Summit gets back to you.

grumpyvette

I just got off the PHONE WITH DOUG FLYNN,( ONE OF HOLLEYS ENGINEERs,) HOLLEY does not at this time ....and does not have any plans in (at least for the forseeable future) of making any differant models/versions of the stealth ram, to fit the C-4 corvettes, yes the stealth ram is a great intake, but in stock form it will not fit under a stock c-4 corvettes hood. if your interested in more info , E-MAIL ME

GETTING YOUR MONEYS WORTH IN A HIGH PERFORMANCE TPI INTAKE REPLACEMENT UPGRADE
read this info below carefully, ITS WELL WORTH THE TIME
http://www.eecis.udel.edu/~davis/z28...age021105.html

read this its very interesting
http://www.gmhightechperformance.com...holleystealth/


http://forums.corvetteforum.com/zerothread?id=609364

NOTICE AS 89 PAUL is getting it tuned in hes starting to run mid 12s and the intake still has far more flow potential



heres some flow figures, right off the manufactures sites in many cases, keep in mind the concept of the chains weakest link, it does ABSOLUTELY no good to match a base or runners on a TPI intake that flows 250cfm if the other part flows 200cfm, youll still only flow 200cfm
the HOLLEY STEALTH RAM FLOWS at 275cfm out of the box, can easily reach 300cfm with minor port work the stock TPI has a hard time flowing 230cfm even with minor port work, look here
most of this info is right off the accel,holley,edelbrock, and TPIS sites, add a little math and the results become much clearer!!!
GETTING YOUR Intake....... length ....... port in -- out
Stock GM Base--- 6.375"------ 1.47"- 1.96x1.2
TPiS base------ -6.125"------ 1.75"- 2.09x1.28
Accel base----- -6.125"------ 1.75"- 2.09x1.28
Holley base------- 6” runner 2.3”- 1.9”x 1.23 (2.337 sq inches)
Runners
Stock TPI----- -- 7.250"------1.470" round(1.70 sq inchs)
SLP ----------- - 6.625"------1.600" round (2.01 sq inchs)
Accel LTR------- 6.625"------1.615" round (2.05 sq inchs)
TPiS----------- 7.625"------1.660" round (2.168 sq inchs)
Mini ram -----3.5”
stock MRII with 1204 (AFR 195) ports, 58MM - 265 cfm
stock MRII with 1206 (AFR 220) ports, 58MM - 281 cfm
MRII clean-up, 1206 ports, 58MM - 292 cfm
MRII cut, weld, port, ect, 58MM - 321 cfm

LT1 ----------3”
Runners (measured individually)
Stock....................203.17 cfm
ACCEL................242.02 cfm
Extrude/ACCEL...275.83 cfm
Super Ram............289.18 cfm
Intake manifold with 3/8 inch radiused intlet
.............................222.45 cfm
Holley stealth ram ………..275cfm
Stock intake manifold with runner
Stock....................198.72 cfm
ACCEL................213.52 cfm
Extrude/ACCEL....217.11 cfm
Super Ram............220.67 cfm
Holley stealth ram …..275cfm

ACCEL Hi-Flow intake manifold with 3/8 inch
radiused inlet.........251.51 cfm
ACCEL Hi-Flow intake manifold with runner
Stock....................215.83 cfm
ACCEL................232.53 cfm
Extrude/ACCEL....243.21 cfm
Super Ram............240.24 cfm
Extrude-Honed ACCEL Hi-Flow intake
manifold with 3/8 inch radiused inlet
............................275.83 cfm
Extrude-Honed ACCEL Hi-Flow intake
manifold with ACCEL runner
............................266.94 cfm
Edelbrock Performer RPM manifold
(Stock)..................286.51 cfm
Edelbrock Victor Jr.
.............................275.24 cfm

HOLLEY STEALTH RAM
Stock…………………………… 275cfm
Ported…………………………..300cfm
Runner lengths
Stock tpi manifold 8” runners 11.25”, cylinder head 6” total 25.25”
Accel super ram manifold 8” runners 7” cylinder head 6” total 21”
Holley stealth ram manifold 6.26” ” cylinder head 6” total 12.26”
Edelbrock performer RPM runners 6” ” cylinder head 6” total 12”
Edelbrock vic jr , runner length 5.5” ” ” cylinder head 6” total 11.5”


Now play with the figure in the calculators below, what youll find is that the if your using a 350 size engine as a guide
[b]
the tpi runner length is ideal for peak tq 3427rpm and 2700-4000rpm for peak hp

the super ram is ideal for peak tq at 4032rpm and 3300rpm-4800rpm for peak hp

holleys stealth ram runner length is ideal at 4700 for peak tq and 5618rpm to 6282rpm for peak hp

the mini ram and lt1 intakes are ideal for peak tq at about 5200rpm and 7244rpm to 8101rpm for peak hp

by hp peak, in the above lists, IM REFERING TO THE RPM RANGE WHERE combination of cross sectional area MATCHED TO THE plenum to INTAKE valve distance WHERE THE internal AIRFLOW HARMONICS TEND TO INCREASE THE CYLINDER FILLING EFFICIENCY (WHERE THE INTAKE WILL TEND TO PULL THE MOST HP)
now KEEP FIRMLY IN MIND the engines tend to enter valve float and get close to engine red line by 6300-6700rpm depending on your combo' after running all the available combos, Ive found a HOLLEY STEALTH RAM has been EXTREMELY EFFECTIVE on several engines tested, CURRENTLY THE STEALTH RAM SEEMS TO BE THE CHOICE, ESPECIALLY IF MATCHED TO GOOD CYLINDERHEADS AND THE CORRECT CAM






http://www.rbracing-rsr.com/runnertorquecalc.html


http://www.bgsoflex.com/intakeln.html


ENGINES ARE A COMBO OF PARTS,ALL PARTS MUST MATCH AS TO RPM RANGE, CAM TIMING,DYNAMIC COMPRESSION RATIO,DISPLACEMENT,VOLUMETRIC EFFICIENCY, GEARING AND AIR FLOW FOR THAT COMBO TO WORK CORRECTLY
a HOLLEY STEALTH RAM is designed for max efficincy in the 4000rpm-6500rpm range, the cams that exactly match that rpm range have at least 220@.050 intake duration and no more than about 245@.050 duration, the rear gearing should be between 3.73-4.11 with a 3000rpm stall and a 10.5-11.5:1 static compression ratio, the heads need to flow above 240@.o50 lift to take close to FULL advantage of the intakes flow potential, ITs hardly the STEALTH RAMS fault if your running the engine in a combo the STEALTH RAMS not DESIGNED FOR if it FAILS to run up to it FULL POTENTIAL!
now you can and will gain some airflow and HP advantage over a stock highly restrictive TPI intake with just the swap to the far LESS RESTRICTIVE STEALTH RAM INTAKE, but YOU WON,T GET THE FULL POTENTIAL unless the other parts match!. HOLLEY GOT 62hp increases with just a swap to a stealth ram in testing on a near stock camaro but ALL of the increase was above 4400rpm, if your shifting at 5000rpm or so, theres no reason to think your spending much time in the correct rpm range so theres absolutely no reason to expect the average hp improvement! theres NOTHING WRONG with the intake! there is something WRONG with the combo/tuning/gearing, if your expecting to realize the intakes full potential!
the STEALTH RAM itself can easily support 450-480 plus hp, out of the box something thats extremely hard for most of the other intakes to do without extensive port work, but expecting a single part , to work correctly, or up to its full potential, when matched to other parts not designed with matching design rpm and air flow is foolish!
if you intend to run the engine combo in the 1500rpm-5000rpm range a super ram or extensively ported TPI is a better match to the engine, but don,t be surprized at all the tailights youll see from guys that do take advantage of the stealth rams potential!

heres a combo that WILL WORK
3000rpm stall
4.11 rear gear
700r4 trans
383 displacement (4.030 bore/3.75" stroke )
5.7 or 6" rods
11:1 cpr
crower #00471 cam
stealth ram/24lb injectors
52mm-58mm throttle body
AFR 190ccheads (74cc)
milodon windage screen
7qt baffled oil pan

DD-2000 predicted 500 hp/513 tq
a somewhat similar engine has recently made 450hp/500tq (flywheel) when built on a 350 zz3 short block

yes 10:1 will be LESS likely to detonate,YES 10:1 is a better choice if your not willing to run 93 octane gas and possiably a bit of octane booster (LIKE I DO!) but keep in mind that the ENGINE ONLY SEES DYNAMIC COMPRESSION NOT STATIC COMPRESSION
the piston compresses nothing on its way up on the compression stroke UNTILL BOTH VALVES ARE CLOSED, so the cam you pick is the determining factor in the true working compression, with the correct cam and gearing you can easily run 11:1 compression on 93 octane pump gas the cam listed above works with aluminum heads, if your running the correct ignition advance and fuel/air mix, you will of course need to figure the dynamic compression ratio OF YOUR PERSONAL ENGINE COMBO BEFORE ORDERING/ASSEMBLING THE PARTS, (youll want to stay under about 8.3:1 dynamic with aluminum heads and about 7.9:1 with iron heads)for 93 octane pump gas but a little carefull tuneing and octane booster will allow some leeway
BTW retarding the cam several degrees not only delays the valve closeing and lowers DYNAMIC COMPRESSION, it tends to move the whole tq curve slightly higher in the rpm range, (good to know if your running right on the edge of detonation with the cam installed on the factory index marks)












:thumbs: :thumbs:





[Modified by grumpyvette, 4:41 PM 7/27/2003]

SurfnSun

Those are some pretty bold statements... :lolg: :lolg: :lolg: :leaving:

:jester

n1kki6

:rofl:

Mr. Magoo

I guess the new Summit Catalog is a misprint! :mad I wonder how many people are going to get screwed! :cuss

Grumpy you don't have to sell me on this intake.............I'M ALREADY SOLD!!! Great info though...........thanks! :cool: :cheers:
You should work for Holley!
When the time comes I'll E-mail you about making the upper for me.

I might not be going with a 383 (Money might be too tight) but how do you think this set-up will work with that intake w/ 24lb Injectors?

Main parts:
91 350 block (Fresh rebuild cast bottom)
700r4 Trans
Ported 113 Aluminum heads w/ 1.6 Roller Rockers
ZZ9 Cam (.05" Duration 212/226, Lift .515/.554, Lobe Sep. 112deg)
Hooker 1 5/8" Longtube headers
SLP 2600 Stall Converter
3.73 gears

I think this type of set-up is what most people have on this board with either a SR, Ported TPI or MR intake. There's not many of us with a 383 or an even bigger motor to work with, I would guess this type of set-up is what a lot of people would be interested in seeing results from.





[Modified by Mr. Magoo, 6:55 PM 7/21/2003]

Bruthish

Grump. I sure hope you have saved your writings or are cut/pasting them...because you sure are long winded :lol:

Ramanstud

:withstupid:

I but I also appreciate his "if you're running under 5000rpm, then stick with the TPI or SuperRam..." acknowledgment. :yesnod:

reallycoolcorvette

where are the cfm flow numbers for the miniram???????????

Mr. Magoo

Yo Grumpy..........are you out there?

War Machine

:iagree:

For $300 I was going to jump all over that. Thanks for the heads-up grumpyvette.

grumpyvette

just some info! that HOLLEY STEALTH RAM SUMMIT ADVERTIZES DOES NOT INCLUDE ANYTHING BUT THE BASE AND PLENUM(NO FUEL RAILS/PRESSURE REGLATOR)
call summit, tech support or better yet HOLLEY tech support................(270) 781-9741
they (summit) wrote the advertizing copy.... incorrectly, you will require IN ADDITION TO THE BASE INTAKE FOR $299 PLUS SHIIPPING THE fuel rail kit # 534185 that costs $ 173.69 additional from summit.....IF YOU GO THAT ROUTE and the stock chevy fuel rails and fuel pressure regulator will not fit, the HOLLEY STEALTH RAM and keep firmly in mind the standard plenum will not fit under the stock corvette hood. If you look closely at the upper right corner picture in that catalog on page 33 of the complete stealth ram in the summit catalog, youll notice the fuel rails are totally differant than the stock chevy fuel rails and FYI, the picture even has them installed swapped end for end in the catalog, the correctly set up fuel feed starts on the pass side rear and the bye-pass line hooks to the drivers side across the front under the throttle body then feeds down the drivers side fuel rail to the rear, the cross-over line is properly mounted on the front between the fuel rails, not as its shown in the catalog.
,look closely DAVID ALLEN from
http://diabolicalperformance.com/
HAS IT CORRECTLY MOUNTED WITH THE CORRECT FUEL RAILS


the part number for the HOLLEY ADJUSTABLE PRESSURE REGULATOR FUEL RAIL KIT IS 534-186, summit charges $215.39 for that adjustable regulator fuel rail kit so youll have $500 plus in an intake that won,t fit the corvette without a hood scoop
keep in mind that while an adjustable fuel pressure regulator is a nice tuning aid, BUT the non-adjustable is set at about 43 psi pressure and most stock to maintain the chevy suggested fuel pressure and many stock fuel pumps won,t maintain over 45 psi anyway,
so if your looking to turn up the pressure a great deal its not going to be a big change!
try it youself http://users.erols.com/srweiss/calcpchg.htm

NOTICE IN THIS PICTURE THE FUEL PRESSURE REGULATOR IS AT THE CORRECT LOCATION, (DRIVERS SIDE REAR) on this custom stealth ram for daves corvette