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Mod | | | Forums66 Topics128,052 Posts1,055,717 Members48,426 | | 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!
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| | | Joined: Oct 2007 Posts: 231 Shop Shark | | Shop Shark Joined: Oct 2007 Posts: 231 | Im going to buy a used engine fan for my 350 this weekend. I was wondering if all the bolt patterns are the same for every year or at some point did they change it a little. My engine is a 1987 carburated. When i bought it it didn't come with the fan and my 1964 283 fan bolt patterns didn't match up. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | There are 2 different patterns.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | George is right, the later ones are usually the bigger bolt pattern. The early water pumps can be either way. I've seen most of the long water pumps with the big bolt pattern. | | | | | Joined: Oct 2007 Posts: 231 Shop Shark | | Shop Shark Joined: Oct 2007 Posts: 231 | Do you know what year they switched over to the bigger bolt pattern? i imagine sometime around when they switched over to fuel injection. I just sort of want an idea of what to look for when i go to a junk yard to pull one. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | look for years around the year of your engine, or just measure the hole spacing on your water pump and find the same, that's what counts, likely any fan from any 350 will fit
Bill | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | | | | | | Joined: Oct 2007 Posts: 231 Shop Shark | | Shop Shark Joined: Oct 2007 Posts: 231 | would i be able to buy a clutch type fan and just take the clutch off? | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | The clutch type fan will only work with the fan clutch. The bolt pattern does not fit either size water pump. | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | If you look at vendor sites you can buy a regular fan at a reasonable price. | | |
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