Cool air in 73-74 model engine bay
 

he guys,

I recently went from a 86 Chevrolet Suburban to a 74 GMC Suburban.

In the 86 I had an opening behind the grill where I hooked up the cold air for the air cleaner:

the hole on the left in this pic

https://lh3.googleusercontent.com/-g...25281%2529.JPG

had this thing in it

https://lh4.googleusercontent.com/-Q...protection.JPG


but the 74 has no openings in the core support behind the grill. I have taken the air cleaner from my 86 hoping to hook the hose up again...but where do you guys get your cold air in these models?

https://lh4.googleusercontent.com/-6...122_211842.jpg

Re: Cool air in 73-74 model engine bay
 

Ha is that what those holes were for? Drawing air into the engine for the air intake? I always wondered what the reason was for them. But If there is no spot on the core support to hook up the intake hose, you could just run a aftermarket air cleaner?

Re: Cool air in 73-74 model engine bay
 

Cut a new hole. Holesaw?

Re: Cool air in 73-74 model engine bay
 

do you mean the open air cleaner types?

the problem I have with this type is that they take in the air from under the hood. I run 100% propane all the time and propane doesnt like heat. It expands a lot faster then gasoline. So the more it expands, the worse the filling of the cilinders will be, this loss in power and economy.

that is why I like to have cooler air from behind the grill or some other place. Especially in summertime in a traffic jam on a warm black road.

@kelsfine69: I would prefer not to cut any holes in my car or any part of it if I dont have to. That is why I am trying to find out how the original cars got their cool air.

Re: Cool air in 73-74 model engine bay
 

Hi Jochen.

Didn't the older models ('73&'74) used snorkels as a filter element? That will mean there is no cold air supply from a hole or tube. As you are running on propane, just cut a hole in the core support like the newer originals. Just so that you can use the stock 'thing' in it.

Re: Cool air in 73-74 model engine bay
 

he Remon! nice to see you here...

what do you mean by snorkel?

http://b.cdnbrm.com/images/products/...pe_snorkel.jpg

Re: Cool air in 73-74 model engine bay
 

Haha, no.

Like this:
http://67-72chevytrucks.com/vboard/p...ictureid=18751

Single or dual: http://67-72chevytrucks.com/vboard/showthread.php?t=544293

Re: Cool air in 73-74 model engine bay
 

juk, no...that will still get you warm air in a traffic jam under the hood...

I dont really wanna hack into the from core support, but I think its the only way yo go...

will be nice summer project.

Re: Cool air in 73-74 model engine bay
 

My all orginal 74 has a round stamped area next to each headlight where it can be cut out for your cold air snorkel to slide into, Look a little closer......

Re: Cool air in 73-74 model engine bay
 

you can run ducts under the bumper

Re: Cool air in 73-74 model engine bay
 

this is a pic from previous owner when he was restoring it several years ago...no holes, see...no prestamped holes either:

http://74suburban.com/Het%20Vervoer/...uiten-1.07.jpg

Re: Cool air in 73-74 model engine bay
 

Can you run the intake over to the corner of the fender where the battery is or is that still going to be too hot? How different are the newer core supports compared to the pre 80's?

Re: Cool air in 73-74 model engine bay
 

My old 74 had the same 'round stamped areas' in between the headlights & radiator.

Re: Cool air in 73-74 model engine bay
 

Maybe the GMCs just dont?

Or I Got te super custom. Maybe those holes are in the fancier editions?

Re: Cool air in 73-74 model engine bay
 

1973-1975 didn't have cold air from the core support. They just had a fluted end on the air cleaner.
1976 introduced the cold air snorkle/intake, or Outside Air...

Re: Cool air in 73-74 model engine bay
 

Or just maybe, Your rig was wrecked at some point and another core installed ?

My truck is a plan jane C10 work truck, My new aftermarket replacement core has the same stamped areas on both sides as well.....

Re: Cool air in 73-74 model engine bay
 

I did dual intake air box out of some 4" flexible drier vent tubing and plastic gutter drain adapter.. Riveted it to my air box once I cut it and shaped it to fit the factory cleaner... Basically replicated ramair box but without spending 300$. The other end if the drier vent went to the factory plastic round adapter in the core support with the front face either removed or holes drilled in it.

http://imageshack.us/a/img31/3989/yv0c.jpg

I couldn't use the setup with the 90 suburban clip as it doesn't have those holes.