P.S.Questions 65 350hp w A/C

[Joe R.]

Re: P.S.Questions 65 350hp w A/C

Joe,

This car has been in the family since the early 70's, never been apart before we ownd it. All equipment and pulleys are what the General installed back in July of 1965.

James West

Hi James:

It could be an optical illusion from the photo, but that sure looks like a deep-groove WP pulley and a standard-groove crank pulley. If GM installed a mis-matched pair, I don't think it was intentional (though a mistake was certainly possible!).

Please take a look at my August 8 post in the following, related thread:

https://www.forums.ncrs.org/showthre...79720&uid=7624

I showed a photo of a deep-groove pulley next to a standard-groove pulley, and described a simple way to tell which type of pulley is installed on a car. I would be interested to know whether this method confirms a mis-match on your car.

On a related note, do you now have a PS belt installed? How well does that line up? If it lines up well, I would be very interested to know the part numbers of the add-on pulley and the PS pump pulley. The number stamped on the add-on pulley may be visible on the inside face, next to the crankshaft bolt. The number on the PS pulley is usually stamped right on the front surface and may be viewable with a mirror.

[William H.]

Re: P.S.Questions 65 350hp w A/C

Hi James,
Thanks for the reply. I would really like to know the part numbers stamped on all the pulleys W/P, PS and both Crankshaft Pulleys. If you have to take it apart to get to one of them then dont worry about it but I think you should be able to read all of them except the 2 groove Crank Pulley as it sits.
Thanks in advance
Bill

[Loren L.]

Re: P.S.Questions 65 350hp w A/C

Noland's book indicates L79's w/C60 and N40 with ECL "AD" 175 cars. The '979 and '904 water pump pulleys are very similar.

Mark

I'd print out your chart, but when I make it larger, it's unreadable. Equipment problem or ???

[Scott S.]

Re: P.S.Questions 65 350hp w A/C

I'd print out your chart, but when I make it larger, it's unreadable. Equipment problem or ???

Hi Loren,

If you're referring to Mark's pulley charts, they are available in pdf format (download full size) at the Thread link below, see post 4 (1965 pulley chart) and post 6 (1967 pulley chart).

https://www.forums.ncrs.org/showthre...420#post503104

If the link doesn't work, try searching " '67 L79 alternator pulley "

[James W.]

Re: P.S.Questions 65 350hp w A/C

Hi James,
Thanks for the reply. I would really like to know the part numbers stamped on all the pulleys W/P, PS and both Crankshaft Pulleys. If you have to take it apart to get to one of them then dont worry about it but I think you should be able to read all of them except the 2 groove Crank Pulley as it sits.
Thanks in advance
Bill

Bill,

I'll get you what I can see.

Thanks,

James West

[Loren L.]

Re: P.S.Questions 65 350hp w A/C

Okay, I bit - mainly because I sat in the TV room and asked "Where did I put those pulleys anyway?"; first two guesses were wrong, so the project heated up.
Car is a 1965 CV, L79, A/C, PS & K66; 4th from the last at #23561; dropshipped at Madison Chevrolet in Scottsdale during the first 10 days of August 1965.
When I bought it as a semi-derelict, the A/C compressor was gone & the 1100697 alternator had been long since buried, so no info on those.
Water pump pulley stamped 3848904 and "CS".
Crankshaft pulley is 1 + 2 configuartion; the 1 is stamped only with an "S", no part number; 2 groove is stamped "GM" and "3858533".
Power steering pulley is stamped steel and bears stamps of "GM", "P"
and "3868892".

(Pardon me for this comment, but I think it needs to be said. This thread represents to me the VERY BEST of NCRS as I grew to know it in the '70s, the 61-2 Judging manual chaired by Keith Kibbe that jerked all of the others into a format change and a detail level not previously seen, etc. A definite GOOD thing that I think is escaping NCRS.)

[William H.]

Re: P.S.Questions 65 350hp w A/C

Thanks So much for the info this is what I am really looking for what really came on someones car. And I agree this thread has been great! I hope there are some more who join in with their configurations.
Thanks again
Bill

[Joe R.]

Re: P.S.Questions 65 350hp w A/C

Okay, I bit - mainly because I sat in the TV room and asked "Where did I put those pulleys anyway?"; first two guesses were wrong, so the project heated up.
Car is a 1965 CV, L79, A/C, PS & K66; 4th from the last at #23561; dropshipped at Madison Chevrolet in Scottsdale during the first 10 days of August 1965.
When I bought it as a semi-derelict, the A/C compressor was gone & the 1100697 alternator had been long since buried, so no info on those.
Water pump pulley stamped 3848904 and "CS".
Crankshaft pulley is 1 + 2 configuartion; the 1 is stamped only with an "S", no part number; 2 groove is stamped "GM" and "3858533".
Power steering pulley is stamped steel and bears stamps of "GM", "P"
and "3868892".

(Pardon me for this comment, but I think it needs to be said. This thread represents to me the VERY BEST of NCRS as I grew to know it in the '70s, the 61-2 Judging manual chaired by Keith Kibbe that jerked all of the others into a format change and a detail level not previously seen, etc. A definite GOOD thing that I think is escaping NCRS.)

Hi Loren:

Thanks, this is great info. You have confirmed that the 3868892 PS pump pulley was produced and was likely factory installed in 1965.

Can you tell me whether this pulley is a standard-groove pulley? If it is, the width of the belt groove should be visibly narrower than the width of the grooves on the dual-deep-groove 3848904 and 3858533.

Can you also check to see if the add-on crank pulley is standard groove?


Thanks,

Joe Randolph

[Joe R.]

Re: P.S.Questions 65 350hp w A/C

Bill------

The GM #346290 pulley is not an original pulley used for your application. In fact, this pulley didn't even exist until about 1974. It was used for 1975-82 Corvettes with P/S. It never even replaced the pulley originally used for your application for SERVICE. Someone just decided on their own to use it.

Hi Joe:

Can you tell me what the corresponding part number was for the 1975-82 power steering pump pulley?

I think the PS pump itself and the mounting bracket position were functionally identical for 63-82 Corvettes, so whatever PS pump pulley was used for 1975-82 should line up with the 346290 when both are installed on a C2 Corvette. That would be a nice combination to confirm.

[Joe L.]

Re: P.S.Questions 65 350hp w A/C

Hi Joe:

Can you tell me what the corresponding part number was for the 1975-82 power steering pump pulley?

I think the PS pump itself and the mounting bracket position were functionally identical for 63-82 Corvettes, so whatever PS pump pulley was used for 1975-82 should line up with the 346290 when both are installed on a C2 Corvette. That would be a nice combination to confirm.

Joe------

The 1975-E80 power steering pump pulley was GM #346289. The E80-82 pulley was GM #14023175. The 14023175 replaced the 346289 for SERVICE after 1981 so the 14023175 is functionally interchangeable with the 346289. What the difference is between these 2 pullies I do not know. I believe that both are 5.72" OD, though.

The 14023175 remains available from GM to this day.

The above-referenced pullies cannot be used on a 1963-74 Corvette unless a 75+ pump is also used. The 75+ pump differs from the earlier in 2 basic ways:

1) The shaft is straight, non-tapered and designed for an interference fit on the pulley with no retaining nut used. This is the feature which necessitates the use of the above-referenced pullies;

2) The reservoir is a "one piece", "tear-drop" shaped with no ovoid, welded-on filler neck.

[Loren L.]

Re: P.S.Questions 65 350hp w A/C

They've both been sandblasted and coated - but they are both 1/2" wide and 7/16" deep.

Hi Loren:

Thanks, this is great info. You have confirmed that the 3868892 PS pump pulley was produced and was likely factory installed in 1965.

Can you tell me whether this pulley is a standard-groove pulley? If it is, the width of the belt groove should be visibly narrower than the width of the grooves on the dual-deep-groove 3848904 and 3858533.

Can you also check to see if the add-on crank pulley is standard groove?


Thanks,

Joe Randolph

[Bryan M.]

Re: P.S.Questions 65 350hp w A/C

Hello,

This discussion got me to wondering about my pulley set-up on my 65 driver with 327/350hp, a/c and ps
I discovered that I'm not going to be able to contribute much to the discussion about original configuration. My car has the following pulley configuration:
1 groove PS 3770509
2 groove WP 3890419
2 groove Crank - Unable to see
Crank add on 3751232

And, after further investigation, it appears that I have a 67 pulley set-up according to Mark's 67 table.
HP - L79 w/C60 - crank 8508383, crank add on 3751232 for N40, and W/P 3890419

The pulley/belt alignment is excellent by the way.

[Mark G.]

Re: P.S.Questions 65 350hp w A/C

Joe & Loren -


steel crank add on and P/S pulleys are std. groove. The 3834720 P/S cast iron pulley is deep groove.

Mark

[Mark G.]

Re: P.S.Questions 65 350hp w A/C





Mark

[Loren L.]

Re: P.S.Questions 65 350hp w A/C

I guess I'm way out in left field - I only know how to measure by using a ruler, tape measure or other primitive devices. Are we saying that there is another way to measure "deep" pulleys other than from the bottom to the top?

Joe & Loren -


steel crank add on and P/S pulleys are std. groove. The 3834720 P/S cast iron pulley is deep groove.

Mark