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Big Block Pulley Question #2463900
03/09/18 06:48 PM
03/09/18 06:48 PM
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340clone Offline OP
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On some of the post '73 big blocks, I have seen a large idler pulley on the driver side of the motor that rolls along the (top) smooth side of the belts. I have only seen it on some motors and am wondering what the application is?

Re: Big Block Pulley Question [Re: 340clone] #2463906
03/09/18 07:05 PM
03/09/18 07:05 PM
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St. Charles, MO
wingman Offline
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Normally the only thing on that side is the power steering pump. Smog pump maybe???


1969 Dodge Coronet Super Bee 383 A4
1970 Plymouth Road Runner 440 FC7 (sold)
Re: Big Block Pulley Question [Re: 340clone] #2463914
03/09/18 07:24 PM
03/09/18 07:24 PM
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340clone Offline OP
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I’’m sorry- I meant to say passenger side.

Re: Big Block Pulley Question [Re: 340clone] #2463932
03/09/18 07:46 PM
03/09/18 07:46 PM
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St. Charles, MO
wingman Offline
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Like this?

400.jpg

1969 Dodge Coronet Super Bee 383 A4
1970 Plymouth Road Runner 440 FC7 (sold)
Re: Big Block Pulley Question [Re: 340clone] #2463990
03/09/18 08:58 PM
03/09/18 08:58 PM
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340clone Offline OP
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Yes! That's it!

It looks like it may be attached to the compressor bracket.

My 440 set up doesn't have it so I'm wondering which cars would have it?

Re: Big Block Pulley Question [Re: 340clone] #2464116
03/10/18 01:24 AM
03/10/18 01:24 AM
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Valencia, España
NachoRT74 Offline
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is part of the compressor bracket and only have seen them on probably lates 74s


it is just to save the slapping belts issue due the distance between compressor and alternator when turning on AC. No adjustments there.

You can notice the front hose to compressor also changes with the in line reservoir more to the inner fender.

!BStUj2w!2k~$(KGrHgoH-D4EjlLlzw8!BKEiRNOMc!~~_1.JPG

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Big Block Pulley Question [Re: 340clone] #2464240
03/10/18 12:24 PM
03/10/18 12:24 PM
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340clone Offline OP
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Wow! That's some bracket! I've never seen one like that. Thank you for the info!

Re: Big Block Pulley Question [Re: 340clone] #2464331
03/10/18 04:19 PM
03/10/18 04:19 PM
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Granite Bay CA
Kern Dog Offline
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Granite Bay CA
Nacho is a wealth of information.

Re: Big Block Pulley Question [Re: 340clone] #2464404
03/10/18 06:46 PM
03/10/18 06:46 PM
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Valencia, España
NachoRT74 Offline
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Originally Posted By 340clone
Wow! That's some bracket! I've never seen one like that. Thank you for the info!


yes, well, thats the full compressor bracket setup ( rear and front ) shown like it was assemblied on compressor itself. This bracket with the pulley attached is of course a bit wider to gives the pulley provission area, but the rest of the bracket is actually the "same"

Can't tell REALLY when or what engines were used... maybe just 440s and maybe just mids/lates 74s ? Maybe 400s didn't get it because the distance is a bit shorter ( lower deck height gives less width too ) ? dunno, althought the pic showns a 400. Those brackets are not easy to find.

I have searched about this because I played with the pulley idea because I HATE the slapping belts when turn on my AC, but then I found they are not common and will need to make AGAIN the AC compressor line, so just forgot about that.

here a pic from the back side of the assembly

!BStUkdgB2k~$(KGrHgoH-DQEjlLlu3hQBKEiRQrGqg~~_1.JPG
Last edited by NachoRT74; 03/10/18 06:56 PM.

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Big Block Pulley Question [Re: Kern Dog] #2464412
03/10/18 06:55 PM
03/10/18 06:55 PM
Joined: Aug 2007
Posts: 6,089
Valencia, España
NachoRT74 Offline
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Originally Posted By Frankenduster
Nacho is a wealth of information.


Not the best info source but I have had to learnt to save from buy wrong parts being imported to my place loosing money on the piece and shipping.

after 16 years on my car I think have learnt a bit thought


With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Big Block Pulley Question [Re: NachoRT74] #2464435
03/10/18 07:42 PM
03/10/18 07:42 PM
Joined: Nov 2003
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Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
Yes Nacho is good people.


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