RPMS Posted October 13, 2005 Share Posted October 13, 2005 I replaced the water pump last night on my 350, and was dismayed to find (after I'd painted it) that the alternator bracket boss on this pump is approximately 3/4 inch closer to the radiator than the old pump. What's going on here? I thought all smallblock pumps were the same. My engine is a 1986 fuel injected block, if that makes a difference. I asked for a water pump from a 1974 Nova, thinking they were all the same. The alternator bracket and original water pump were from a 1984 Camaro 305. Can someone help educate me? Quote Link to comment Share on other sites More sharing options...
shortbed454 Posted October 13, 2005 Share Posted October 13, 2005 for the most part all the pumps are the same but chevy did make some slight changes to the pump case. the nova had a different alt./pd pump set up then the 84 camaro. you will need to go with the camaro pump from now on. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted October 13, 2005 Share Posted October 13, 2005 Can you weld on a piece of steel and drill a new hole? Quote Link to comment Share on other sites More sharing options...
getZ Posted October 13, 2005 Share Posted October 13, 2005 There were two styles of small block chevy water pumps (excluding the new LT-1) that I know about, a short and long style water pump. I thought the short was for 68 and below, the long for 69 and up. I believe the difference was about 3/4 of an inch as well. I know you can buy spacers for the short one, but it sounds like you have the long style. Quote Link to comment Share on other sites More sharing options...
Mike C Posted October 16, 2005 Share Posted October 16, 2005 There are quite a few different water pumps. Short pumps with 5/8" pilot for Corvettes through '81, short pumps with 9/16" pilot for pass cars through '68 and trucks through '72. As you have found out, early and late style long pumps. Aluminum pumps like the '84 Corvette that is a short pump but a different dimension block to pulley than the earlier short pumps. Then throw either standard rotation or reverse rotation into the mix if you have serpentine drive. As you can tell, whatever accessory drive you have dictates the pump you need. Quote Link to comment Share on other sites More sharing options...
RPMS Posted October 17, 2005 Author Share Posted October 17, 2005 Can you weld on a piece of steel and drill a new hole? I could, but since the pump was a whopping $18.00, I'd probably just buy another one instead just to keep from going through the trouble. Since the new pump already has a boss on it (but in the wrong location) I'd have to grind that one off before I could weld the new one on. Major PITA. Thanks for the suggestion, though! Quote Link to comment Share on other sites More sharing options...
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