SBC Long water pump or short water pump? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-22-2008, 03:16 PM
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SBC Long water pump or short water pump?

how to tell difference between long water pump and short water pump on small block chevy - the a/c has been removed and the alternator may have been moved to the passenger side?/

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Old 04-22-2008, 03:24 PM
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If the back of the pump is about 1/2 inch away from the timing cover, it's long. At about 0 clearance (maybe a sixteenth of an inch) it's short.

Pat
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Old 04-22-2008, 05:11 PM
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Here's mine - - is it long or short ?
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Old 04-22-2008, 05:49 PM
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Quote:
Originally Posted by wretched ratchet
Here's mine - - is it long or short ?
Wretched ratchet ... yours is a SHORT style Chevrolet water pump.

As a general rule ... if you can get your index finger in between the water pump and the timing chain cover ... it is a long style pump. A short style pump fits too close to do so.
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Old 04-22-2008, 05:58 PM
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thanks, I thought it was but wasn't sure enuff to say so
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Old 04-22-2008, 10:00 PM
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Yours actually looks like it might be a marine pump with the dual-pattern pulley bolt holes, but you're right, it is a short pump.
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Old 04-23-2008, 11:08 AM
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Also notice how the first groove on the crank pulley sits right against the dampner? That is a dead giveaway of a short water pump.
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Old 04-23-2008, 11:45 AM
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Quote:
Originally Posted by curtis73
Yours actually looks like it might be a marine pump with the dual-pattern pulley bolt holes, but you're right, it is a short pump.
Actually, most rebuilt and aftermarket SBC water pumps now come with the dual pattern on the pulley mounting flange
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Old 04-23-2008, 12:01 PM
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if it hadn't been short, my radiator project would have sucked and failed
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Old 04-23-2008, 04:35 PM
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whats mine short or long ?
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Old 04-23-2008, 04:39 PM
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Quote:
Originally Posted by cabowabo
whats mine short or long ?
looks like a short one to me - - -right, Guys???
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Old 04-23-2008, 09:18 PM
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Quote:
Originally Posted by cabowabo
whats mine short or long ?
uuuhhh, couldn't you give us a little bigger picture??? i can't ever hardly see the front of the engine, much less the water pump...

...with the drive it's bound to be short.
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Old 04-27-2008, 11:56 AM
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This one look like a short pump? Based on Deuce's post, I'm assuming so. I'd also heard that if the plug was vertical, it was a short, and if the plug was at an angle, it was probably a long. So I'm fairly sure this is short but just looking for a little confirmation before I dive into trying to acquire an alternator mount. Can't provide any useful make/model info, as this is a 350V8 transplanted into a 65 Nova. I'm not positive of the origin of this engine as it has one of those very common codes - 3970010. The stamp up by the head is ML22800, which I haven't been able to accurately cross reference.

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Old 06-27-2008, 09:34 PM
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Old 06-27-2008, 10:27 PM
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Here's something I learned from motorchrome.com, and it seems to apply to both SBC and BBC.

Quote:
Waterpump : This bracket is for small block Chevrolet engines with long water pump and will mount the alternator on the passenger side of the engine just as the factory brackets do.

LWP: Alternator mounts on passenger side.
SWP: Alternator mounts on driver side
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