Chevy 350 exhaust

[Zero Hero]

I have a 1987 Chevy c20 that's has a 350 in it and was wondering why it sounds like an airplane when I rev it. In most videos I see if people reving their trucks I only hear the exhaust and when I try to rev mine all I hear is an airplane noise coming from the engine bay. Only way to really hear the exhaust is to be literally at the end of the tail pipe.

 

[HotRodPC]

And the problem is? Are you one of those that louder means faster? Just so know, it's not true. I don't even hear my truck when it's idling or when I jump on it. When I jump on it, all I hear is Quadrajet Groan sucking air and I like it that way.

Thread moved to property category.

 

[Rusty Nail]

Fan clutch. Try to spin the fan by hand. It should make a LOT of revolutions, easily.
HAYDEN brand fan clutches only.

 

[74 Shortbed]

Probably a non-thermal fan clutch.

 

[spenser21]

I cant say airplane noise, but my engine bay was super loud and you could definitely hear that over the new exhaust. my exhaust that I put on is a set of long tube headers, straight back to 2 borla mufflers. Its not super loud until you get on it but ive always heard the engine noise more. anyway I adjusted my valves and its purring pretty quiet now. weird to get in the truck now and not hear the engine running.

this is the video I followed... https://www.youtube.com/watch?v=z_hY2M4oZc8

 

[74 Shortbed]

Lifter noise can be irritating..

 

[MikeB]

Fan clutch. Could be a non-thermal model, or a thermal that doesn't slip anymore. Or it could be a severe duty clutch that doesn't slip as much as a std duty.

Combine any of the above with a steeply pitched fan, and you have lots of propeller-type noise.

 

[yevgenievich]

I wish my suburban was not audible unless standing right by the tail pipe. Stock style muffler a bit loud for long trips