86redIROC

Can anyone tell me what clearance issues there are with the stock IROC hood when swapping from TPI to Carb? Is there a particular carb/aircleaner combo that clears better than others?

Thanks for the Help!

r0nin89

Well from what I've seen putting different airclears on my car a stock carb/TB with no spacer and a 3" drop base aircleaner should clear perfectly. Make sure your stud is very tight to the cleaner otherwise yull put a nice dimple in your hood.

ZZ4 86 Z28

iTrader: (1)

i just swapped to carb and it fit no problem. just get a drop base air cleaner. 14x3 works good. make sure you get a drop base and not a flat base. heres a pic of my brand new setup. all fits with plenty of clearance.

Tru2Chevy

I have a Performer manifold and a non-CC Q-jet on my car at the moment, and with my drop base 2 5/8" aircleaner, I can close the hood, but it does hit the aircleaner. Should be fine once I cut out a little bit of the stock underhood bracing though.

- Justin

86redIROC

Thanks guys! Way cheaper than trying to modify the TPI system! What Carb are you guys running?

redbird_400

Just a side note, this tip that I picked up from some dude at a speedshop. I told him of my clerence issue when i did carbswap, had to add a 1" adapter for my new carb. He asked if I ever changed the motor, indeed I have. Dude says that chevy and pontiac use different kinds of motor mounts. Chevy uses some metal style while pontiac uses a rubber style. I'm not sure how much of this is correct but he says its common that ppl run into clerence problems when doing these swaps because it raises the overall height of the engine. Ehh.. I dont think these cars run into to many clerence problems when doing the swap, unless your replacement intake manifold is taller than the stock one that you must swap when doing a FI to Carb swap. Other then that since most of these cars were designed with TBIs and knowing that people would change the air cleaner out, maybe they set a standard for most 3rd gens to allow such clearance. Though with my edelbrock elite air cleaner, I used the maximum amount of clerence. You can see a small ring from the air cleaner on the underside of the material heat shield which under the hood.

> oh, just saw the question. Right now I'm testing a Road Demon 525 for my 305. Some look at 525 as a small number for a 305 but others say thats fine cause demons flow alot of gas anyway. I have to see it for myself though, cant belive 10 different opinions and facts all at once.

five7kid

iTrader: (14)

With regard to 3rd gens, that's absolute rubbish.

camaronewbie

Clearance depends mainly on the intake. I have a Performer RPM (same height as Air Gap) with Edelbrock 1406 under stock hood on my 1992 RS, but I had to use the banjo fitting for the fuel line to get the drop-based air cleaner to clear carb, and I had to use a 5/8" plastic spacer under the air cleaner to clear the electric choke, then used a 2 1/2 inch element instead of 3 inch to make up the difference and clear the stock hood. Like anything else, you'll have to test setups to get the right fit.

redbird_400

Thank you for all of your friendly helpful advice.

ZZ4 86 Z28

iTrader: (1)

wow, it must be a lot easier with holley carbs. just slapped a drop base right on with a generic feul line. no problems...maybe i had a drop base meant to do that?

mdricken

I've got a ZZ4 crate engine with a holley.

Not too happy with it as I only get about 3" to work with so I have to use a 1 inch tall aircleaner.

I think my next option is a small cowl hood because there isn't even enough room for an intake hat.

Air_Adam

I have an Edelbrock RPM Air Gap, dual feed Holley, and 14x3 air cleaner. It just barely fits under the hood of my Camaro, it does. Its got around 1/2" of hood clearance... less in some places, but it doesn't rub.

The key is just using the right air cleaner for most setups... you need to use a dropped base air cleaner, but lower is better. With a tall manifold like the RPM, a 5/8" drop probably won't be enough, but 1.25" is pretty common, and works with most setups without problems.

RArnold

I'm struggling with air cleaner setup right now -- have a 14" round Edelbrock with what looks like the right drop base, but it wont fit due to the HEI distributor...went with an Edelbrock Elite triangular style , clears the distributor, but sits way too high....was supposed to be only 2 3/8" tall from the top of carb air horn to top of a/cleaner, but I dont think so.......my intake is a Wieand Action Plus with a non-CC Q-jet......I havent seen a drop base a/cleaner that wasnt 14" in diameter..........need help, hate to drive with no filtration...........

Air_Adam

I'm using the Edelbrock 14" round base, and had an HEI distibutor not long ago. It was tight, but I was able to use the two together. I just had to route all the plug wires away from the front of the distributor cap, or under the air cleaner base. It was a tight fit, but it did work. It worked just fine with the stock intake, an Edelbrock Toker, and an RPM Air Gap as well.

Bowtye101

Easy cut a hole in your hood and you've got all kinds of room not to mention a breath of fresh cool air. Just an option

maroon88iroc

iTrader: (7)

i have a holley street dominator intake and a holley 650 double pumper. i have a summit drop base 14" base i believe it is 1 inch. i have to run a 1 inch filter so it will clear the hood. can anyone help me out with some advice on how i can get it to sit down lower? b/c right now it is close and i have to put a 3/4 inch spacer in there now and i dont have enough room for it.

i guess i will have to make something on my own.

JamesC

iTrader: (5)

Poly motor mounts, 350 HO Deluxe with Holley, 14x3 drop base. The wing nut leaves an impression in the under hood insulator, but then so did my dual snorkel lid.

JamesC

maroon88iroc

iTrader: (7)

does anyone have any advice for me? im having to run a 1 inch tall filter to clear the hood. zz4 can you measure the base of your cleaner? im running the 1 inch filter and a drop base and it is still real close, and i have to somehow find out how to put a 1/2 inch plate under my carb?? any help? it would be greatly greatly appreciated.

Bowtye101

I guess either loose the spacer or get an aftermarket cowl hood or like me just cut a hole in the hood and run a blower scoop. Good luck with whatever you decide to do.

ZZ4 86 Z28

iTrader: (1)

my car is back home right now, but its a 3 inch filter on a drop base and theres no problem. not sure why yours doesnt fit. i got a performer rpm too.

Bowtye101

if your using a spacer between your card and intake unless you modify your hood you will have to loose the spacer.

ZROLimitRacing

found that one out the hard way

84z28350

With a performer EPS intake, 600cfm carb and the edelbrock open element air cleaner i had less than 1/8" clearance from the wing nut to the hood!

If anyone is planning on going this route i would highly suggest not trying to use a carb spacer!