what is the water pump # for a 71 LS-5 car with a build date of dec.would it be a 3992077? about how much does a water pump cost, with the right # an date? what is the average price now for this pump? thanks
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Re: water pump 71 BB
Current '70-72 JG book says pump casting number 3856284 was used '70-71E (up to VIN 1400) BUT there was an overlapping mixture of pump casting number 3992077 used as early as VIN 2077 in 1970. By December of '70, the 'correct' pump would most likely be the '077 casting...
Last I looked Goathill (frequent advertizer in NCRS Driveline) was getting $120 for the '284 pump and $110 for the '077 pump. Plus, Dr. Rebuild's catalog listed the '284 pump at $123.75 and the '077 pump at $114. You need to confirm pricing currency.
On date coding, remember it's the stated policy in early Shark Judging Guides to PROHIBIT judges from attempting to verify casting dates on water pumps due to poor visibility (they go from the general outline silhouette alone). So, finding the 'correct' casting date to match your car's engine boils down to personal restoration pride on your behalf vs. judging point realization.... -
Re: water pump 71 BB
lyndon-----
GM casting #3992077 is the correct one for your application. A quality-rebuilt, correct pump which is correctly dated will cost in the range of $150-200. They are available from sources like Dr. Rebuild, Bill Mock, and Goat Hill Classics.
By the way, the 1969-74 Corvette big block waterpump castings are among the scarcest of waterpump castings, although they are not what one could call "rare". During this period, most all big blocks used long-leg style pumps. Only Corvette and some MD/HD trucks used the short leg waterpumps. So, the only original source for these castings was those models (or, SERVICE pumps manufactured by GM after 1969).In Appreciation of John HinckleyComment
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Re: water pump 71 BB
Jack----
Regardless of what the JG says, I don't think that a single 3856284 casting was used on ANY 1971 Corvette or, for that matter, any 1970 Corvette, either. As a matter of fact, there was another casting "between" the 3856284 and the 3992077. That casting was the GM #3940960. It was used for later 1969 models and most, if not all, 1970 models.
I've never seen a '284' casting with a date that would be right for a 1970 or later Corvette and I don't think that I ever will.In Appreciation of John HinckleyComment
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We've been down this road...
You may be 100% correct and the JG book IS wrong on what it says, Joe. But, until the appropriate National Team Leader accepts a policy change in that area, I'm personally 'stuck' with quoting what's currently accepted....
I sure hope you're making these water pump inputs through channels to get the books changed. We need fresh and convincing inputs to improve our system. I don't have drawing access to confirm or deny what you say about the relative availability of the '608, '609, '175, '326 SB pumps or the '284, '077, '100 BB pumps, so I go by the book.Comment
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Re: We've been down this road...
Jack-----
Yes, we have. And, a '284' casting is still just as incorrect on a 1970 or 71 Corvette as it was the last time we "travelled this road". It will be that way in the future, too, for as long as time goes on. No one's found a way to change the past and I don't think that they ever will.
As far as a 1971 goes with a '284' casting, I'm waiting for someone to show me an UNREBUILT waterpump with a 3/4" pilot and a date on the casting which could have been used for a 1971 Corvette engine. Of course, even if such a thing could be shown to me, it could still be a SERVICE piece. However, I'd be ready to agree that a '284' casting could have been used on a 1971. I'm not holding my breath, though.
As far as a '284' casting on a 1970 LS-5, I wouldn't rule it out completely. I think that it's very unlikely, but I wouldn't rule it out completely.In Appreciation of John HinckleyComment
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Re: We've been down this road...
Ya'll just hang on. The 1970-72 TIM & JG is in final stages of revision.Dick WhittingtonComment
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