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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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Joe,
Drill a 1/8" hole in the thermostat and you will get a little coolant flow to/through the head until the thermostat opens.
I have been doing this a 1960 261 for 47 years, and with a 1959 261 thermostat for 20 years.
I cannot see your 261 "bypass" housing, but I doubt it is the same as any housing used on any 235. I'll see if I can post some photos that were posted here when Deve was drawing/reaching some interesting conclusions regarding the later 281s' by-pass thermostat and housing. | | |
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