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I am in the midst of replacing my shaking harmonic balancer, and while doing that I noticed a few pulleys on my engine are not the right ones. I had to shim the power steering pulley, and the pulley has 2 grooves in it. My crank pulley has one groove, with a power steering add on. My water pump pulley has 3 grooves, and the middle one isn't being used since my crank pulley only has 2 grooves. I would like to get everything back to neutral, but my engine is not an original base or L46, (its somewhat modded), and the 2 have different crank pulleys. My question is what crank pulley do I need, and if I go with an L46 setup(only 2 belts), do I need a different power steering pulley than the base model?
Last edited by ace_cobra; Jul 12, 2017 at 11:08 AM.
A yard stick wont help, I dont have any pulleys at the moment. I did some researching and the pulleys that came off my 350 werent for a 350 at all. The PS pulley was from a 454 BB, #3878245, the WP pulley was also from a 454 #3889372 and the crank pulley was from a 66-67 327 single groove. Needless to say, none of those are going back on the engine.
If the L46 and base engines have different crank pulleys, how can they have the same PS pulley? They both show having GM# 3834720
Hi AC,
The info I have indicates 350 engines WITHOUT a/c used a 'cast', single groove, pulley with open spokes on the power steering pump.
Look at Paragon Reproductions #1352
Maybe?
Regards,
Alan
Hi Mike,
Yes I have. On page K418 it references the two pulleys, # 3770509 and 3834720, however looking at the Chassis and Body parts catalog it lists 3770509 for 350 with A/C only. Mine has no A/C.
Alan,
I noticed this one from Ecklers as well. It appears to be the same GM # but non cast and without spokes. So I guess all 350's without A/C had the same PS pulley, whether it was a base or LT-1 motor? http://www.ecklerscorvette.com/corve...Product_Viewed
Last edited by ace_cobra; Jul 12, 2017 at 11:45 AM.
Hi AC,
Remember 70 and 71 LT-! cars didn't have p/s as an option.
So the cast pulley would apply to 70… 300hp and 350hp motors, and in 71 & 72 cars to just the base motor.
I'm thinking the 72 LT-!, when also equipped with a/c, would have a stamped steel pulley on the pump?
Regards,
Alan
The L-46 was an optional engine, so you will find specific details (and differences from the base engine configuration) in the back of the AIM under the L-46 engine option drawings.
Yeah, I am mostly wondering about the PS pulley now, but there is a corvette junkyard around here that I am going to have a look through. I might be able to get both styles and see what ones fit.
Thanks all!
Here is my info. I made a table a few days ago and saved it to my records. Recognize that I am using the "3rd" add on pulley as a the path for the A/C. The notes to the right are to the best of what information I could gather. Below the table is a picture of how my belts run from the driver's side of the engine
and another from the passenger side of the engine.
Be aware that the notes for me.
Here is a good link to investigate GM Pulleys. According to the below website, for example--- 3995641 replaces 3848904 (3898904 allegedly the correct one for a 1968 L-79). http://www.gmpartswiki.com/gmpart?gmpartno=3995641
Last edited by carriljc; Sep 6, 2024 at 11:44 AM.
Reason: add table and 2 pictures
L46 VS Base 350 Crank Pulley
