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Re: Suggestions on radiators for a 261
BLUEMEANIE #1370229 Wed Jul 22 2020 09:28 PM
Joined: Sep 2001
Posts: 30,448
ace skiver
If you might be considering changing the radiator/etc, you might want to otherwise consider installing Pre 68 Dave’s water pump relocation plate. The cooling “efficiency” will be much better with the fan located centered on the radiator.

http://chev235guy.blogspot.com/2013/08/1955-62-water-pump-relocation-adapter.html


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Suggestions on radiators for a 261
BLUEMEANIE #1370252 Thu Jul 23 2020 12:04 AM
Joined: Jan 2013
Posts: 1,662
S
Shop Shark
I have the original radiator in my 53, meant for a 216, now with the 261 in it, it will spew coolant with a 4lb cap and 50/50 antifreeze after traveling a good while then idling for a prolonged time in 80+ temps. I might try a pusher fan, it will conceal nicely. Thinking it would be nice also to have it re-cored for a 4 cores too. Like to keep the stock tanks. But first I will install a puke tank to catch the coolant.


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Suggestions on radiators for a 261
BLUEMEANIE #1370283 Thu Jul 23 2020 02:12 AM
Joined: Sep 2001
Posts: 30,448
ace skiver
sstock

What year 261?

If 1955-2nd or later, did you use the adapter for an earlier water pump?

http://chev235guy.blogspot.com/2013/08/1955-62-water-pump-relocation-adapter.html?m=1


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Suggestions on radiators for a 261
BLUEMEANIE #1370336 Thu Jul 23 2020 04:07 PM
Joined: Mar 2011
Posts: 942
B
Shop Shark
Originally Posted by tclederman
If you might be considering changing the radiator/etc, you might want to otherwise consider installing Pre 68 Dave’s water pump relocation plate. The cooling “efficiency” will be much better with the fan located centered on the radiator.

http://chev235guy.blogspot.com/2013/08/1955-62-water-pump-relocation-adapter.html
Too far along at this point to drill into the block again so I'm using a new short shaft pump designed for the '56 engine. I will also be using a custom made shroud that should help negate the offset positioning of the fan.

Re: Suggestions on radiators for a 261
tclederman #1370380 Thu Jul 23 2020 09:50 PM
Joined: Jan 2013
Posts: 1,662
S
Shop Shark
Originally Posted by tclederman
sstock

What year 261?

If 1955-2nd or later, did you use the adapter for an earlier water pump?

http://chev235guy.blogspot.com/2013/08/1955-62-water-pump-relocation-adapter.html?m=1
Yup, I have Dave's relocation adaptor so the fan sits nicely. Maybe I should look for the bigger diameter balancer to speed the water pump up?

Last edited by sstock; Thu Jul 23 2020 09:50 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Suggestions on radiators for a 261
BLUEMEANIE #1370430 Fri Jul 24 2020 01:21 AM
Joined: Jul 2014
Posts: 234
1
Shop Shark
One can use factory parts with the late water pump. Here's what I did: found a 6-blade truck fan in a wrecking yard mounted to a 327 V8. Took the fan and water pump pulley home measured the difference in the offset between the V8 pulley and the 6-cylinder pulley. Bought a *new* water pump and pressed the flange further onto the pump shaft by the difference between the pulleys. Already had a four-row radiator out of a 2-ton AD so I modified its mounting flange to drop the radiator enough so the bigger fan would clear the lower radiator hose AND I mounted it on the front side of the radiator hoop using only three screws not six. It is possible to do this without putting the radiator in front of the hoop but you will skin your knuckles every time you take the fan bolts out, which you will have to do to change the belt(s). It's been like that for 25 years and never overheats, even in hot weather pulling a camper in the mountains.

Later I installed air conditioning using one of Patrick's bracket kits. I found that one belt would not drive all the accessories. Belts lasted about 5,000 miles tops. So I modified the bracket setup to accommodate a two-shiv crank pulley from an outfit in California and a two-shiv water pump pulley for Chev V8, specified for A/C. It's 10% smaller than non AC. So now I have two belts to drive the A/C and water pump/fan. Still need two belts to drive the alternator. That belt slips under heavy load. I'll have to modify that bracket. There are better brackets from which to start, like from the hot rod AC suppliers.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Suggestions on radiators for a 261
BLUEMEANIE #1370750 Sun Jul 26 2020 04:42 PM
Joined: Jan 2000
Posts: 2,064
J
Shop Shark
My '46 261 and Vintage Air, using the stock radiator out of a 2 ton, nice and thick, no troubles over several years. Also have a pusher fan that I don't switch on unless in traffic or really hot days. Has the low water pump, had to whittle fan down to clear everything, would have used pre68Dave's piece had I know about it back then, Think I restored this truck about 1990, been making changes all along the way.


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy [stovebolt.com]
1953 Chevy 3/4-ton Factory Stakebed [stovebolt.com]
Re: Suggestions on radiators for a 261
BLUEMEANIE #1370991 Tue Jul 28 2020 12:36 PM
Joined: Nov 1995
Posts: 4,640
J
Unrepentant VW Lover
FWIW, I am running the four-row repro radiator from Jim Carter's in my truck with a 261. Stock water pump in the correct position and the original fan. I'm quite pleased with it. I found an NOS overflow tank at Winchester one year so I'm not sure if it burps much.


John
"There is a life about to start
When tomorrow comes..."


'49 Chevrolet 3804

Re: Suggestions on radiators for a 261
John Milliman #1371924 Mon Aug 03 2020 02:59 PM
Joined: Mar 2011
Posts: 942
B
Shop Shark
Originally Posted by John Milliman
FWIW, I am running the four-row repro radiator from Jim Carter's in my truck with a 261. Stock water pump in the correct position and the original fan. I'm quite pleased with it. I found an NOS overflow tank at Winchester one year so I'm not sure if it burps much.
"Stock water pump and the original fan" ...stock for the 261 or for your '49 truck?

I plan on installing an overflow tank too.

Re: Suggestions on radiators for a 261
BLUEMEANIE #1371934 Mon Aug 03 2020 05:11 PM
Joined: Sep 2009
Posts: 317
G
Shop Shark
I am running a 216 radiator and 216 fan on my 261 (with adapter plate to relocate the water pump), and I have run my truck in 100 degree temps, idling at stop lights, etc. and no problems yet. I bought the radiator 5 years ago from Jim Carter.


-Patrick
1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

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