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flx261 #1451342 Wed May 11 2022 03:32 PM
Joined: Jan 2000
Posts: 2,215
J
'Bolter
Also if you are running straight coolant try 50/50 water mix and see if that makes a difference. Best of luck


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy [stovebolt.com]
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flx261 #1451363 Wed May 11 2022 06:03 PM
Joined: Jul 2014
Posts: 362
1
'Bolter
I have used a surfactant called "Water Wetter" on my rig. It is supposed to improve heat transfer from the metal to the coolant and vise versa. It helped some, maybe 10deg.

Also, I have run across situations where the crank pulley was slipping on the rubber it was supposed to be bonded to. So the water pump/fan did not turn as fast as expected. This problem took me much too long to figure out.

I have run Chevrolet 235s for many years and 200+ water doesn't seem to bother them. Running continuously above 2800RPM does heat the oil to 250 and up. I don't think that's good. Do you have an oil temperature gauge? On a 261 with an external oil filter you could install an oil cooler if you find high oil temperature.


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.
flx261 #1451372 Wed May 11 2022 06:45 PM
Joined: Jun 2021
Posts: 38
F
flx261 Offline OP
'Bolter
Thanks for the replies, folks.

Coolant is 50/50, currently, or real close.

I have heard of the Water Wetter, but have not tried it, yet.

We are not monitoring oil temperature. We do not have oil filtration on this engine.

Take Care,

Joshua L. Coder

flx261 #1451774 Mon May 16 2022 01:26 AM
Joined: Jan 2013
Posts: 2,118
'Bolter
I’m currently running a 261 in Texas (100 degree days already). I have an aluminum radiator, 7 lbs radiator cap, pusher fan, 160 degree thermostat, and 848 heads (with steam holes). Have not had an issue getting above 190 degrees yet.

Do you have the correct steam holes in your head or have a gasket blocking a hole?

Just a thought. You’ve gotten pretty good advice in this thread!

Chris

Joined: Jun 2021
Posts: 38
F
flx261 Offline OP
'Bolter
Originally Posted by ndkid275
Do you have the correct steam holes in your head or have a gasket blocking a hole?

Chris

Chris,

Thank you for your post. I have only just recently become aware of the steam holes 'issue'. I have not the first idea if the holes are present and/or a gasket may be blocking said holes.

If other remedies do not resolve the high operating temperature (high by my estimation) we may have to pull the head and have a look. That is not something I have ever done but suspect we could figure it out.

Take Care,

Joshua L. Coder

flx261 #1452158 Thu May 19 2022 11:42 PM
Joined: Feb 2004
Posts: 24,758
H
Kettle Custodian (pot stirrer)
"Steam hole" is a misnomer. The holes in the head are there to provide coolant flow alongside the three pairs of cylinders that are "siamesed" together without a gap between them to allow for the big pistons. An 848 casting number head can be drilled to work with the 261 engine by using the 261 head gasket as a drilling template. The small block 400 V8 used the same system to avoid hot spots when the cylinders were siamese-cast to allow for a 4 1/8" bore size on that engine.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

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

WAG MORE- - - - - -BARK LESS!
flx261 #1452168 Fri May 20 2022 12:54 AM
Joined: Dec 2018
Posts: 1,722
F
'Bolter
fix261 Did you drill the steam holes in that 235 head ?? Also the 261 gasket with those holes in it??

flx261 #1452228 Fri May 20 2022 06:08 PM
Joined: Jan 2013
Posts: 2,118
'Bolter
I used waterwetter in my race bikes which were only rode when warm out and kept inside. Although it’s good for heat (racing), I’m not sure if I’d use it in the great white north. It changes the freezing temp of your radiator fluid mixture which will cause issues next fall when the tundra freezes.

SKOL!

Chris

Last edited by ndkid275; Fri May 20 2022 06:09 PM.
flx261 #1452252 Fri May 20 2022 09:42 PM
Joined: Feb 2004
Posts: 24,758
H
Kettle Custodian (pot stirrer)
The only reason we ran water wetter in the race engines at Nashville was a $500.00 fine by the track management for getting caught with antifreeze in the engines. Even a tiny coolant leak while running antifreeze left the track as slippery as snot!
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

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

WAG MORE- - - - - -BARK LESS!
flx261 #1452277 Sat May 21 2022 03:05 AM
Joined: Jan 2013
Posts: 2,118
'Bolter
Jerry,

Is that Midwest snot in January or Texas snot in august?

That’s why I used it as well!

Chris

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