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Mod | | | Forums66 Topics128,129 Posts1,056,360 Members48,441 | | 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: Aug 2007 Posts: 116 Shop Shark | | Shop Shark Joined: Aug 2007 Posts: 116 | I finally fired up my cadillac 261 today.... Started fairly quick (motor was built by Tom Langdon) and sounded good with the open headers. I have a question though. Being that this is in a 39 1/2 ton I don't see how I have enough clearance to run a fan on the water pump. Anyone else have a 261 in their 38 39 40 1/2 ton. Were you able to use pump mounted fan or did you use electric?
Any help would be great..
Thankss
Last edited by fatboy0169; 07/11/2010 1:07 AM.
http://www.flickr.com/photos/50657267@N08/sets/
1939 1/2 ton Resto-mod
1937 1 1/2 ton Is in the driveway
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | There is an adapter offered to use a 216 water pump. This helps in AD trucks. It may work for you. Search Ebay for "water pump adapter 235". | | | | | Joined: Aug 2007 Posts: 116 Shop Shark | | Shop Shark Joined: Aug 2007 Posts: 116 | Oh I thought the block was longer
http://www.flickr.com/photos/50657267@N08/sets/
1939 1/2 ton Resto-mod
1937 1 1/2 ton Is in the driveway
| | | | | Joined: Feb 2004 Posts: 29,811 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,811 | The external dimensions on the 235 and the 261 are identical. They just recored the block to handle the bigger bore size. One of our competitors in the "hobby stock" class on the round track circuit in the early 1960's ran a 261 in a 50 Chevy business coupe against our 239 cubic inch flathead Fords in 46 Ford coupes. He claimed it was a 235. He gave us quite a run for our money until we put in Mercury 4" stroke crankshafts and got the cubic inches up to where we were competitive again. When one guy cheats, everybody else has to follow suit!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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| | | | | Joined: Aug 2007 Posts: 116 Shop Shark | | Shop Shark Joined: Aug 2007 Posts: 116 | Jerry I agree... My 39 had 216 in it. Were the 216 shorter than the 235 and 261
http://www.flickr.com/photos/50657267@N08/sets/
1939 1/2 ton Resto-mod
1937 1 1/2 ton Is in the driveway
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | The difference in length is not in the block, it is in the water pump shaft. | | |
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