Red69corvette

Im restoring a 69 corvette,that has a 350/350 HP numbers matching motor with (C60). Factory air. Are these two pulleys correct for that application and year
*crankshaft pulley 71/4od GM#3850838BG
*Waterpump pulley 63/8 OD GM#3890419CT

thanks

Alan 71

Hi R69,
Welcome!
First Post!!

The information in the new NCRS 68-69 Technical Information Manual & Judging Guide indicates those are the part numbers for the water pump and crankshaft pulleys on your 69 350/350.
They were both typically painted semi-gloss black.

Regards,
Alan

Would be nice to see a few photos of the convertible you're restoring!!
It's always interesting to see what people are working on.

Red69corvette

THanks for the info!!! SO the pulleys are correct for factory air car, will the factory AC belt work with thiose pulleys????
thanks again,

Alan 71

Hi R69,
I believe 350 engines when installed in cars with the a/c option use in addition to the 838 pulley, an added single groove pulley at the crankshaft location… pulley #3751232.
Regards,
Alan

Red69corvette

Thank you, Mr. Alan,
can you help me with the correct GM belts per my motor size for AC, water pump/ gen.& power steering?
also would like to know should I be looking for a 5 blade or 7 blade fan Assy? Finally what is the correct clutch unit for
s/b AC car
thanks in advance

rogernison

My Jan/69 L46 WP pulley is #3876846DJ .
I am second owner, had it since '73 , FWIW !

bailys

Another '69 L46 restorer here with pulley questions. I have a pulley alignment problem. I had my motor rebuilt by a shop so I don't know if they installed a thinner balancer. My problem is that the pulleys aren't lining up and the generator belt in the #1 track is going to rub the face of the power steering pump. My hard drive crashed and burned along with the 10000 pics I took during disassembly so I can't refer back to them to see if I had an alignment problem before the rebuild but I know the belt wasn't rubbing the power steering pump. I think my problem is with the crank pulley being a fraction of an inch too close to the block. Here's what I have:

Crank pulley 3911013BW (tracks 1 & 2) - this agrees with pg 331 of the AIM since I have a/c, I think this is the problem which is throwing off all three tracks
Crank front pulley (3rd track) 3751232BB - this agrees with pg 429 of the AIM since I have power steering
Water pump pulley 3876846 (tracks 1 & 2) - this agrees with pg 331 of the AIM since I have a/c
Water pump pulley 3883235 (track 3) - this agrees with pg 196 of the AIM

Any ideas?

carriljc

Submitted for your review. My research on pulleys and what mates with what.

https://www.corvetteforum.com/forums...post1595410814

wolvercote

74 L82 with original engine, A/C, A.I.R. pump. Smog pump is original and water pump I bought NOS. When I tried to install correct belt from smog pump to water pump it was about 3" short. I bought NOS water pump. Could it have wrong pulley? What is diameter and part number of correct pulley. Appreciate any help.
Thanks

carriljc

Post the part number for the pulley that is on your car. We can start with that.

carriljc

Meanwhile, take a look here and see if you can find your pulley?
http://gmpartswiki.com/getpage?pageid=52023

wolvercote

Thanks for info, will go look for # on pulley. Car is at friends home 65 miles away.

wolvercote

Went to work on car, could not find see number on pulley as it is installed but, I was able to find a matching belt only without the correct and number and date. Will address that at later date. I thank you for your reply and info. I will save it.

wolvercote

OK, pully # is 3991424 and w/p # is 330813. Smog pump pulley and w/p pulley are both 6". Any info is appreciated.

carriljc

3991424 is for 71-74 350 w/ C.A.C. (whatever C.A.C. is???)
SO.....
http://gmpartswiki.com/getpage?pageid=52023

As far as 330813 -- this comes up as some sort of spacer so it seems you have an incorrect number or a typo....still chasing this guy down some more.

wolvercote

It is # 330813, date code H13. There are several w/pumps for sale on e-bay and elsewhere with that part number. Still looking for help.

carriljc

Per this link... 330813 is for later 72 corvettes. See post #3 from Paul L.https://www.corvettecentral.com/c3-6...riginal-243100

Looks like 330813 is a WATER PUMP part number:


"-1972 SBs assembled after approximately the end of May 1972 use #330813 as in 1973 and later."

https://www.corvetteforum.com/forums...post1544529582

wolvercote

So I have correct water pump with a correct 6" pulley and correct belt from water pump to correct smog pump which also has a 6" pulley and still cannot make belt fit. I see on e-bay that they list water pumps with 6" and 7" pulleys, they didn't by any chance make a 5"? Was there more than 1 type mounting bracket for the smog pump. If I had hair I would be pulling it out now.

carriljc

check out these fan belt lengths and see if you got the correct length.
http://gmpartswiki.com/getpage?pageid=52030

carriljc

This might be a silly question, but do you have the appropriate spacer and are you using the appropriate add-on smog pulley?

http://gmpartswiki.com/getpage?pageid=52030

see this drawing:
http://www.corvetteamerica.com/catal...corvette-belts