Air Intake Duct

[L31MaxExpress]

These engines never have moved much air. Not making 200 hp. If you take the air cleaner off and listen, you will find the heads are the choke point.

It is actually the exhaust, then the cam, then the TBI in that order. The heads are good for a solid ~350 hp.

 

[classman]

A cozy place for snakes and rodents. As if the 90-degree bend was not enough restriction!

 

[Mikes98]

I have to wonder if the "restrictions" were done as part of reducing NVH (noise, vibration, harshness). The small snorkel opening would act as a venturi to speed up the air flow and maybe that was a requirement for the resonator boxes (think: blowing across the neck of a Coke bottle). I had a new model '94 S10 with the TBI 4.3L. Thing had an intake snorkel opening *smaller* than the air box opening on my DR350 dirt bike. Along with the tiny opening were a couple of resonating chambers molded into the snorkel. It was a CAI though ...

 

[giaguaro]

Do anyone has the p/n of the 4.3 v6 straight duct?

 

[df2x4]

Do anyone has the p/n of the 4.3 v6 straight duct?

Looks like it should be 15529814. Unfortunately it's a discontinued part, no longer available new.

https://nemigaparts.com/cat_spares/epc/chevrolet/53c-c/03/tc03-017/

 

[fancyTBI]

Do anyone has the p/n of the 4.3 v6 straight duct?

Hey that’s me, haha.

 

[giaguaro]

Hey that’s me, haha.

Yes Sir! We don't have v6 nor '8 in the junkyard here in Italy, and yours is the best Pic found

 

[Pinger]

Re the 'missing' duct. Where the filter box goes through the inner fender is higher than where the air enters the fender cavity. Without a connecting duct, the fording depth is increased - no?

 

[giaguaro]

Looks like it should be 15529814. Unfortunately it's a discontinued part, no longer available new.

https://nemigaparts.com/cat_spares/epc/chevrolet/53c-c/03/tc03-017/

In another scheme the 814 seems to be connected to the resonator isn't it?

 

[df2x4]

In another scheme the 814 seems to be connected to the resonator isn't it?

If the schematic you posted is from an eBay listing I wouldn't trust it. Especially if there are no pictures of the actual item in the listing.

The site I linked to (Nemiga Parts Chevrolet) is very accurate in my experience. You can't purchase anything from there, but it's a good reference that doesn't erase part information from the schematics when they're discontinued like many others do.