Ok, I've spent the last hour searching the archives but I'm still confused about what will and won't fit under the hood of my 88 IROC - I sold my TPI system last week and I just bought a brand new Holley Avenger 670, but which manifold should I get? I'd like the Performer RPM but it sounds like I'm going to have clearance problems. What about the Stealth, some say it's shorter, others say it's the same, I could go for a regular Edel. Performer, but that would kinda suck, wouldn't it?

my combo:
'84 short block w/882 heads
Comp cams Xe262 - 218/224 @ .050 464/470" 114deg. sep.
2100stall converter
soon to be 373 gears

 

this wont help you but i put my motor in with a weiand team g intake, 2" spacer, and a holley 750 and i need at least 3" to get the hood to close. that is without the air cleaner. if you have solod motor mounts it will make fitment even harder like it did with me. i am going to need a 5-6" cowl just to be able to close the hood with an small 3" air cleaner.

 

The Performer is a decent intake and will fit. Holley makes a single plane that will fit. I don't remember the model, but if you go to their website you should be able to find it.

 

I`ve had the preformer, the RPM and the stealth, they all fit under the stock hood, Moroso drop base air cleaner and three inchx14 filter all fit good, even had a q- jet with a rpm..that was the limit. Went to a big block and harwood three inch crowl and currently run a demon 850 on a RPM with a 4 inchx 14 fits real nice!

 

Thanks for your help guys. An iroc hood should be the same as the one on Greez's 85Z28 shouldn't it? Does yours have the cheesegrater?

 

I've got a Performer RPM on with my factory QJet and a dual snorkel setup (non-drop base). I have less than a 1/2" clearance from the hood. A good drop base would give you the clearance you need.

And yes, all 85-90 IROC hoods were the same as the 85-87 Z28 hoods.


spartyon: No offense, but running that intake with a 2" spacer and 3" aircleaner and complaining about needing a 6" cowl hood is ridiculous. Get rid of that 2" useless spacer and get the correct aircleaner and be done with it... all under the stock hood. Installing a 6" cowl to clear a spacer and filter is crazy man!

 

Ok, obviously there are enough guys that have the Performer RPM/carb combo fitting that I'm going to go ahead and order the RPM, but why are there guys who say they can't close their hood even without an aircleaner? Just curious.

 

my only guess is that they dont realize the full length aircleaner stud can be cut or is removable....

ive been told things were impossible to fit, that i was running...

anything the same height as a standard height Vic Jr, or shorter will fit under a camaro hood with a holley or edelbrock on it.

i dont know about the pontiacs, but you can always modify the filter housing to make it work.

 

Because they're running tall single planes with huge spacers that don't do anything but lighten the wallet... and hurt hood clearance

An Edelbrock Victor Jr is an excellent single plane, and is actually shorter than the dual plane Performer RPM. Spacers are totally out of the question unless you're running a stock height intake.

 

See sig. And all BARELY fit under the stock hood. I broke 2 studs off of my hood louvers. So, I got a cowl induction hood, and just ordered an airgap intake.

 

Do you think it could be the Vortec heads have higher ports or are just higher in general? Is it an IROC thing (vs. just a Z28?) What is your guess as to why yours was a problem?
Of course I just bought a Performer RPM, which is even higher than yours...I guess I'll find out when it (and the Aveneger carb) get here next week.....sigh...why can't anything be easy...I got rid of my TPI to avoid hassles...

 

The Vortec heads are a little higher. The ports are 2" long.

 

True, the ports are a little higher, but that's not the problem. There are dozens of guys here running the Vortec heads and a taller intake than you with no hood clearance issues. Your problem lies elsewhere. What aircleaner are you running? Are you running a carb adapter or spacer?

And Cra-Z-Canuck: I'll say it for the last time. The Z28 and IROC hood are identical. Its not a Z28 vs IROC issue...

 

you're doing somthing wrong.


because thats not even a tall intake manifold... unless you ment the performer RPM and didnt put the RPM in there......

 

I have an 82 Z and I am running the RPM air gap intake, edelbrock performer 750 carb . With a drop top air cleaner and 14x3 inch filter I have close to no hood clearance.

Digger

 

BUT...

it fits

 

I've run a Torker II with Holley TBI and 650 double pumper. I've run a Performer EPS with a 650 double pumper and a Road Demon 625. They all fit under the stock hood with a Moroso 14x3 open air cleaner.

 

Whoops. Double post.

:hail: :lala:

 

Crazy: the Performer RPM manifold will fit with either the edelbrock carb or a holley with even enough room for a Nitrous plate IF you get the right aircleaner.



Look here

 

I had the tall version of the holley street dominator intake and a 670 cfm holley street avenger carb. With a 3'' drop base element it barely fit under the hood. I would have to slam it down alittle but it fit under a 88 SC hood.

Now I have a 3'' cowl...aaahhhh flat base and no worries

 

Just so I have this straight.....If I'm running an RPM air gap intake with a Speed Demon carb, so long as I get a drop base air cleaner it should fit? yes/No???

I have my engine in now w/o the hood on yet, and it doesn't LOOK like it will fit. The top of the carb is almost level with the master cylinder lid.

Thanks for any replies....I'm willing to hold off on getting a 500 dollar cowl hood if I can. Just making sure of "the final word".....

Sounds like Digger's fit, but he was using an Edelbrock carb, and I don't know if a Demon carb is any taller....

 

I tried installing a 1'' spacer today. Couldn't close my 3'' cervini cowl with a 3'' flat base air cleaner.

Oh well I don't need it...I just had it and thought id try it.

 

A Stock set of motor mounts, a 1985 350 block, an Edelbrock Preformer intake, a Holley 770 Street Avenger, Stock (outside) Vortec heads, an Edelbrock foam insert air cleaner (the triangular one), and I'm doing something wrong? (Maybe the intake manifold is on backwards) I love people who just sit back and make idiotic comments......

 

Well, I guess there's no actual definative answer in this thread as I hoped there would be. Guess I'll find out soon enough whether the RPM air-gap intakes are any taller than the Performer RPM.

I'll post what I find out.

 

Although I always thought they were taller than the Performer RPM, Edelbrock claims they are the same height.

 

well for starters, if you're going to run a taller setup with a low clearance car, why the hell did you pick a tall aircleaner!?


2nd, me and several people i know have had very bad experiances with that air cleaner.... keep a close eye on the inside of the back of the foam... it likes to crumble apart and then goes thru the motor... and even one backfire can burn thru it.. im not too fond of it.


so now atleast you know what the somthing wrong is... a regular cheapie 14"x3" drop base air cleaner will easily fit... and you can fit 14"x4" if you use the better GM drop base...


i love people who say things that i have already done are impossible.


(old pic from whn i was in highschool.. total budget motor..)

 

also, side note:
that aircleaner draws air from above. only from above.

when you had the stock hood, and you knew it would be close, why would you want to have all your air sucked in thru the tiny gap between the underside of the hood and the air cleaner?


im not trying to knock, ya, we all make mistakes, just look at the motor pic i have there and you can probly find several.
but dont overlook the obvious, then be a smartass online about it.

 

Vortec heads, Perf RPM airgap, holley 770 Street Avenger, New Poly motor mounts and an edelbrock dropbasae aircleaner assly with a 3" K&N.

Fits under stock hood.

I drove it around for a few wekkd with no hood and I did notice that it took a while for the new poly mounts to settle in a bit.

I prolly have less than 1" of clearance with the hood all the way down.


looking across the fender from hte side of the car you'd never think that it would fit but the stock IROC/Z28 hood does have a slight bow to it in the middle.

You should be fine.

 

Thanks Hodge, that's just the answer I was looking for.....Hey, you don't happen to know the part# for tyhe air cleaner you have do you??

- Thanks!

 

Or anyone else....I have to clear a HEI distributor too.

 

no part number on it but it's just the standard 14" drop base aircleaner that you can get at Autozone. Nothing fancy

 

its nothing special.

any drop base 14" air cleaner will work. most people run a 3" tall filter.

you can order it thru summit or just goto your local auto parts store and yank one off the shelf.

i believe the one i have in the pic i posted is a mr gasket "daytona" one... im kinda amazed i remember that after all these years.. lol. it was one of the first things i bought for this car.

 

Same intake, 750 Performer carb, and 2" drop base...mine "barely" fits. It took out some of the hood stuffing to make it breathe easier as the stuffing was getting caught in my filter...

Besides...cowls look good.

 

converted from tpi to carb. went with holley street dominator and speed demon 650, with no air cleaner I can close the hood but not by much so I will have to get a cowl hood a 2 inch should do it

 

No cowl is needed. I swapped v6 to v8 , converted the v8 to carb( it was a tpi motor when i got it), Went with a edlebrock performer rpm manifold, with a 3/4 inch carb adapter and a 650 holley. Any REAL drop base filter housing will fit your needs fine.









Old pic. Also its under a stock firebird hood. I heard some place that cams have a little more room then birds. Dont know how true it is.

 

Just for the record, for when someone hit's

I have the 82-83 stock Z28 'glass hood, Fastburn (vortec style) heads, Performer (No RPM, or air-gap) with the stock air cleaner, and I now have a nice groove in the underside of the hood where the air cleaner lid hits it. My mounts are probably original (I have most of the service records from most of it's life, and nothing is there) so I likely have a bit of sag in there to help, also.

This is probably an easy fit with the Steel, or the newer IROC/Z28 hood.

Hope this helps someone!

 

Also for-the-record:

'91 RS, stock hood, 355 with GM heads (stock, but not from this car ,) Performer RPM (old style, non-airgap,) Edelbrock 750, 14x3 K&N with the el-cheapo chrome 1" drop base from AutoZone. And I have 3/4" to spare. Checked it with play-doh.

 

Now that is something to try. LMAO!!! I bet it works good too.

Tom

 

Just reporting back in! I ended up using a Mr. Gasket drop base air cleaner w/ 2" element, and it fit.

That's using a Professional Products Crosswind intake, Demon carb and a 1/2" wooden spacer. Had to use a spacer for a low profile vacuum fitting on the intake.

All under the stock fiberglass hood.

I'd like to try the Play-Doh thing to see it I can go to a 3" thick element. Hmmmmmm..... lol