I am looking for someone here on the Corvette Forum that has a 1974 (L-48 or L-82) that has A/C; Power Steering; but no AIR installed that can take a picture for me of the pulley configuration you are using on your car. Pulley for water pump, crankshaft pulley, crankshaft extension pulley, if you have the setup I could use a picture or two or three showing your pulley and belt configuration.

Thank you in advance of any help you can provide.

Best regards,

David Howard
AllVettes4Me

 

Dave, I don't know if this will be helpful at all, but this is how I did mine when I put the electric fans in using the 2 groove pully.

 

Thank you for doing this but unfortunately it really doesn't help me with what I am seeking. Stock cooling fan; stock water pump; stock power steering pump; stock a/c compressor; and stock pulleys on the crank; no AIR setup. Pulley drawings in the AIM are confusing at best and I have two options so I am hoping someone with a stock 74 setup as described can help me with pictures.

Thank you for trying though.

David

 

I have this set up on a 72 but not sure that helps.....? Just let me know and I'll see what pics I have or I can take any you need tomorrow.

Brian

 

I take it that you do not have an A.I.M. for 1974. This configuration MUST be an L-48, as it was the only SB which did not come with the AIR system.

 

Yes I do have the AIM and yes it has this drawing of the configuration. I am just looking to find one that confirms this is how they have you running belts in the 1974.

Configuration for L-48 and L-82 with C-60; N-41; with M-40 and no A.I.R.

When you add A/C to a previously non A/C car you have to change a few things and I am getting those parts now. Example: the lower crankshaft on my non A/C car is a two groove pulley part number 3858533. When you add A/C you add a pulley 3751232 for C-60 and N-41 options. The problem is you also have to swap out that two groove pulley for a different two groove pulley part number 3911013; otherwise the two pulleys don't fit together correctly. I learned this over the weekend by studying the diagram shown below.

I did not realized at first that C-60 was a/c; and N-41 was power steering; but once I got that then the rest fell into place.

Notice in the drawing that the crank pulley is number 1 in the drawing; and listed are four different parts for number 1. I was not tracking initially on the codes but I have it now.
I am just looking to confirm that the configuration shown in the drawing above can be confirmed by someone with the setup as per original.
I hope this helps.

Thank you and best regards,
David Howard
AllVettes4Me

PS: I bought the index sorting electronic AIM manuals for years 68-82 from Willcox Corvette a number of years ago and they have been invaluable in determining the differences in parts from one year to another. I pint out the pages I need as I am working on the individual sections of the car. These are pages I printed and then photographed so they could be referred to here on the CF. If you don't have the AIM manuals I would highly recommend them, they are very helpful.
David

 

Thank you Brian. Yes, that configuration is the same according to the AIM for 1972 for a Base 350. The 454 and LT1 are different yet again. Amazing. But if your is a base engine then this should be your configuration and yes, a picture will help.

Configuration on a 1972 with A/C and PS.

Thank you for your offer.
David

 

 

Above are some I already had posted on my website....Let me know if you need any others taken and I'll try to get to them tonight.

Brian

 

The simplest way to get what you want: put A/C on belt by itself; put P/S and alternator on the 2nd belt. You should have BOTH belts should go across the crank and water pump, so that there is redundancy--one belt breaks, you still pump water while you can run, thus preventing overheating.

 

Brian, thank you again. The pictures you posted confirm what I thought the original setup would be. Thank you sir, very helpful.
David

 

Now that is an interesting proposition and one I will think on and see what I can do. The beauty of this is I can do all of this work on the rolling chassis before dropping the body back onto it making access for playing so much easier. I am working now on whether or not to abandon my other plan, but that will be a different post. For now, thank you for your input.

David

 

What are you trying to do? I added a/c to my 68 and I have all the pulley numbers and I have pictures of how I did it. I also have Power Steering. Are you adding a/c?

 

Yes sir. I Am adding A/C to my non A/C car. I have purchased and expect to receive my Vintage Auto Air kit on Friday and I am trying to work out the configuration of the front pulley's and belts that will be needed. I see that a C60 a/c fan is different than my stock fan is as well. I hate learning as I go, more expensive this way, but so it goes. If you have this information it will be very helpful and appreciated. Thank you.
David Howard
AllVettes4Me

 

AllVettes4Me

Ok. I can link you to a bunch of pulley numbers that will work. Do you have a smog pump? And, if so, are you keeping it? Meanwhile -- let me go get the pulley thread I made.... it will assist you in determining what you want to do. I'll add another post with info in a sec.

 

AllVettes4Me
Go to this post and start reading there. I think it will assist you in researching what you want to do. https://www.corvetteforum.com/forums...post1595410814

You can go to the beginning of the thread and you'll have more info and there are pictures included. Ask away if you have questions.

If we want to come up with solutions you will probably need to get the pulley numbers so we can get them matched up.

 

I located my pulleys now and have added the third groove and have the new crank pulley and the new ones fit together just fine. I am checking on the water pump pulley now but once that is resolved I have the pattern needed.
Thank you for your help, I appreciate it.
David Howard
AllVettes4Me

Water pump pulley 3991424 was what I needed and I have located it now and purchased one, due Wednesday.
I also needed a new crank pulley, and extension, have them both now as well. Crank pulley was 3751232 and extension was 3911013.
Should be good to go now.
Thank you to all.
David Howard

 

AllVettes4Me

Glad you got it all figured out. I think that if I was doing this nowadays I would get a serpentine setup from 80s-90s GM ...because of the price of pulleys.