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| | | Forums66 Topics128,035 Posts1,055,441 Members48,422 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Oct 2006 Posts: 20 Apprentice | | Apprentice Joined: Oct 2006 Posts: 20 | I have recently got my 51 flat bed 1.5 ton back on the road. I put a 261 engine in it. It has the short water pump with 16" blade. Its over heating, the regular pump makes the fan blade hit the lower drum on the 4 pass radiator. I can't move the radiator forward without cutting metal. Can anyone give me another option. I am thinking about an electric fan in front of the radiator | | | | | Joined: Feb 2005 Posts: 469 Shop Shark | | Shop Shark Joined: Feb 2005 Posts: 469 | Pitch the short pump buy the adapter for the early style pump. This will put the pump back to the corect place on the rad thus letting the fan pull air though the rad like it should. I've used both set ups and the adapter works the best. I'm currently running the adapter set up on a boom truck that gets the crap worked out of it with no heating problems at all. | | | | | Joined: Jan 2005 Posts: 1,602 Shop Shark | | Shop Shark Joined: Jan 2005 Posts: 1,602 | I also put the water pump adapter plate on my firetruck's 261 motor and it has zero overheating issues. It sounds like a pain but put on the adapter and your over heating issues are gone. Then you can move on to the next problem... LOL | | | | | Joined: Oct 2006 Posts: 20 Apprentice | | Apprentice Joined: Oct 2006 Posts: 20 | Where can I purchase this adapter plate | | | | | Joined: Feb 2005 Posts: 469 Shop Shark | | Shop Shark Joined: Feb 2005 Posts: 469 | They sell on ebay for about $40 plus shipping. | | | | | Joined: Nov 2008 Posts: 65 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2008 Posts: 65 | Sounds like you've got the answer already, but just in case you go with the electric fan, be sure your charging can handle the extra load. | | | | | Joined: Jan 2005 Posts: 1,602 Shop Shark | | Shop Shark Joined: Jan 2005 Posts: 1,602 | One of our own stovebolt members sells them. His name is Dave and that is where I got mine. Search adapter plate on the Stovebolt and he'll surface. | | | | | Joined: Oct 2006 Posts: 20 Apprentice | | Apprentice Joined: Oct 2006 Posts: 20 | OK, so the problems continue. I just received the adapter plate, it states that the harmonic balancer and water pump should be off the original 216, which has already left my possession. Can I use the 261 balancer or do I need to start looking for a 216 balancer, of which I had two of, not more than 4 months ago. The original water pump I can purchase, though I have two new ones, patricks and a short pump which now I can't use. Any suggestions. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Yes, you can use the 261 harmonic balancer as long as its groove width matches the grooves on the alternator/generator pulley and the water pump pulley.
Jim Carter has the older style pump with either 3/8" or 5/8" pulley.
Get an older-style and a newer-style water pump gasket (no matter what the instructions say about the need for gaskets).
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