I have a problem with belt alignment on my car. It is a 1967 Camaro with a
crate engine and short water pump. The problem I'm having is that the
crankshaft pulley is in too far by ~1/4". This keeps the belts from lining
up with the water pump pulley. I need to find out if I have the correct
pulley for this engine.
I have been told that the correct crank pulley for a 350cid/295hp is
actually 2 pulleys, one for the alternator and A/C compressor that goes on
first and another pulley that nests inside this one for the power steering.
Is this correct?
The current pulley I have is a 3 groove pulley GM part # 3751232. It has
the letters BB beside the part #. Maybe this stands for Big Block
Is there anyone out there that has any information on this?
My "3 groove pulley" was actually 2 pulleys that were half painted, half
rusted together. Closer inspection revealed this and I was able to pry the
two pulleys apart. This answered one part of my question. I still have a
problem with the pulleys being in 1/4" too far on the crankshaft. Does
anyone have any suggestions on why this is occuring or how to correct it?
On Wed, 28 Jan 2004 22:53:34 GMT, "David R. McCoy"
Here's something for you.,
68' RS Camaro
88' Formula Bird
Some are wise and some are otherwise
I did run across this website when I was searching for the part # of the
pulley. What I can't figure out is why I have such a large (1/4") offset
between the crank pulley and the water pump pulley. I thought that the
water pump pulley might be incorrect but when I measured how much deeper it
would have to be to line up with the crank pulley, I found out that it would
be 1/16" or so from touching the water pump which seems to be too close.
Has anyone ever heard of using a spacer between the harmonic balancer and
the crank pulley?
I have had the same problem myself on two engines. I think the problem is
the hubs aren't pressed on the correct depth on the water pump. I have taken
a set of pulleys off of one engine that lined up fine, only to find they
don't line up on my engine. I ended up running a set with about 1/4" miss
alignment. That was about 12 years ago and I'm still driving it today with
no problems. this is in a low rpm truck motor. but 1/4" over that distance
doesn't seem to be a problem for me. One thing I can tell you for sure.
don't buy any of those cheap chrome plated pulleys. They are never
concentric and they always wobble. that will cause you many more problems
than a 1/4" misalignment. - Gary
Yes, I have used chrome pulleys in the past. I got poor results also.
Regarding the misalignment, I suppose I could make a spacer between the
crank pulley and the balancer. I would have to be sure that it is perfectly
balanced since it would be rotating quite rapidly. That makes me think that
I'd need to go to a machine shop. I keep hoping there's a less expensive
When I bought this car 14 years ago, I noticed that after awhile I would get
alot of "belt dust" on the alternator. By belt dust I mean that the belt was
rubbing excessively on the pulley causing increased wear. I wasn't
concerned about it at the time. Now, I think that is what might occur if a
misalignment was present. I figured that with an new engine and water pump,
the misalignment problem might go away but I wasn't that lucky.
Do you see evidence of increased belt wear on your truck?
For 14 years the belts didn't align. So you use the same pulley on a
crate motor with the same results? Egads! Call Year One and ask for the
The wrong water pump and alternator pullies will destroy belts, and
cause a 1/4 inch gap with ease. Over the last 54 years GM has made more
pulley combinations that will bolt to a SBC then I could list in a week.
Yeah, that sounds bad doesn't it. Maybe I should clarify. I bought the car
14 years ago and drove it for about 1 year. It has been parked since 1991.
When I installed the crate motor, I remembered that this misalignment that I
see now was present back in 1991.
You were right about the water pump hub. I didn't have the tools to do it
(large hydraulic press) but a friend did. He pressed the hub further in.
It's running now with no alignment problem. Thanks for your help!
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