I been doing some research and scanning the forums but I can't quite figure this out.

396
Short water pump
Alternator (Driver side)
Power Steering (Driver side)

How many grooves are on the crank and water pump pulleys?

My 67 engine came with a 2 groove water pump pulley
and a 2 groove crank pulley with a bolt on 3rd groove.

I don't know if this engine would out of a A/C car anymore. So I not sure if I have the proper pulley set.

Mines a 68 396 with air has 3 belts.Believe yours would need 2.On mine 1 belt for PS.1 belt for alternator.Mine has 3 groove off water pump,6 blade fan.

So am I getting this right?

I need 2 grooves on the water pump pulley AND
2 grooves on the crank pulley?

P/S & Alt.

If so, I wonder what this 3rd single pulley was used for. It bolted to the front of the 2 groove pulley on the crank. Weird...

Third groove is for ac. No ac then just remove it.
Steve
www.stevesclassicautoair.com

So am I getting this right?

I need 2 grooves on the water pump pulley AND
2 grooves on the crank pulley?

P/S & Alt.

If so, I wonder what this 3rd single pulley was used for. It bolted to the front of the 2 groove pulley on the crank. Weird...


No... The bolted on third pulley on the crank is for the Power Steering... Power Steering uses only 2 pulleys (crank and PS pump)

The inner groove on both the WP and crank should line up with the alternator...

The second groove should be for A/C...

Alternator belt goes on first, then A/C and finally the P/S belt goes on last...

Without A/C, just a single groove is needed for the crank and water pump... But still the additional crank pulley for the Power Steering...

Sorry was going to chime in remembered just had 2 on water pump,3 on crank.with air.You might need the 3rd groove of the crank , for the PS if it doesn't line up right if you move it to the 2nd not wanting to bend the brackets just a thought.There should be a belt configuration types in the assembly manual,in mine 68 its around page 100 or so.Mines 1st groove(against motor)Crank,water pump,Alternator.2nd groove crank,WP,Comp.)3Rd Crank to PS(short belt)PS pump with detached resorvior.Hope it helps.Lewis

66L78
My mistake had long water pump on the brain
Steve
www.stevesclassicautoair.com

Ah ok.

Turns out that I have a full set of pulleys for an A/C car.

Guess I need to located the correct pulleys for a non A/C car. :(

http://myweb.cableone.net/mdthode/Pulleys.jpg

Found P/N on my pulleys.

Water Pump: 3876846
Crank: 3876844
Power Steer: 3874416 (3rd groove bolt on to crank)

Does anyone know the part numbers for the single groove crank and single wp pulleys?

Also, how are most of you finding these P/N's? I would like to know so I don't have to keep asking P/N questions.

Thanks...

They will be in the assembly book,believe you need single grove WP pulley and 2 groove crank for the power steering.Belive ground up carrys all of it.Plus the belts.Can get you for 68

2 groove crank pulley #3874418,1 groove water pump #3905995

Ok, now I see how to read this book. I also have the assembly manual for the 67 chevelle. I found water pump pulley 3905995 (1 groove) and crank pulley 3874412 (1 groove) listed. The power steering pulley that goes on with the crank pulley I currently have.

Guess I start hunting these....thanks all. Would be cool to trade my pulleys for the ones I want, but how many people have A/C cars lol.

The water pump single pulley is the same for SB/BB, should be easy to find. The crank pulley is different for SB/BB, the BB has a larger hole in the center. You could use the SB crank pulley if you can't find a BB one.

I see where you're getting the pulley part numbers from in the AIM but remember the crank pulley listed is just for the single groove to run the alternator. If you'll turn to the next page (UPC 6, sheet A6), in the upper right you'll see the p/s uses the 3rd track on the crankshaft. It appears that whether or not you have A/C or A.I.R., the P/S still uses the outermost groove of a 3 groove pulley system and the water pump still is the single groove unit since there is no A/C or A.I.R. requiring a 2nd groove on the water pump.

In my GM parts book they show a 3 groove crank pulley as #3871258 fitting 65-67 Pass w/P/S (396,427), 66-67 Chevelle (Acc Air Cond, w/P/S) (396), 67 Camaro w/P/S (396). Whether this pulley is a single unit, 3-groove piece or simply a bolt-on 3rd pulley and needs a 2-groove pulley isn't clear but I do not see a 2-groove crank pulley for a 67 396 Chevelle listed.

I'd be happy to send a couple of pics of the pages in the parts manual if you'd like. Drop me a line (396guy@chevelles.com) and I'll get them to you.

Also, if you're not already aware you soon will be, part numbers change all the time. I've seen some part numbers change once or twice in the AIM (the W/P pulley changed from 3788472 to the listed 3905995 in June of 1966). Other parts have changed from the AIM to one P&A catalog I have (both from 1972), one Rev 8-31 and change again by Rev 8-72. And, these were 33 years ago.

I see the picture your talking about and you may be correct.

My currently pulley setup that came on my engine is the picture at the bottom right corner ( just under the one you pointed out).

I'm trying to find the P/Ns for the correct pulley configuration for a 67 Chevelle SS with only an Alt and P/S being driven.

Far as I can tell, the water pump is 1 groove 3905995 correct?

If so, what is the 3 crank pulley and matching powersteering pulley?

I can use any help here. Justing trying to round all this up.

Ok more research...

I looked thru all the pulleys year ones sells. I located the only 3 groove pulley and its listed for "Crank pulley for big-block 1965-1968 396/375 hp (L78, L89) models with power-steering."

I have the 325HP engine.

Then I find a "Crank pulley for 1964-1967 model with PS, without A/C; and 1967 307 models with PS, without A/C. " listed and its only a single groove pulley. I think this is the bolt on pulley for PS.

I think I am sure the water pump pulley is the single groove 3905995.

I just not sure of the crank pulley I need to run the Alt. Is it a single groove with the bolt on single groove for PS setup? Or is it a 2 groove pulley with bolt on PS groove one...just using the 1st and 3rd grooves for the belts.

Rodeo,
I am not sure about a bigblock but on my smallblock 65 I am running the two groove crank with addon power steering pully on the crank, and the single groove water pully. I do not have AIR. The belts line up just fine. The add on powersteering pulley I believe must be used with the two groove crank pully even though you are not running air. I haven't seen any other pulley aragement other than this. There is no other way for the belts to line up using stock mounts on the steeringpump and alt.

65Camino

I have seen the single groove crank pulley. I am just trying to find out if the car should originally have had a single groove crank or 2 groove crank.

Think I got it figured out now that the PS pulley is a bolt on pulley that goes on the outside of the crank pulley. And the water pump is a single groove pulley.

The single groove pulleys looks like it sits the same as the 2 groove one. If the single pulley was used, looks like only a small gap between the 2 pulleys.

So, should the crank one be a single or a 2 groover? I see it doesn't really matter, but for originally point of view...which is it?

IMO you should use the single crank with the add on power steering pulley. Take a look at this post (http://www.chevelles.com/forums/showthread.php?t=26583). I had posted pictures of the pulleys in question.

Woohoo....you hit this one right on the money!

Thank You!
:beers: