The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Which t-stat to use.

**Boog** · 09-11-2005, 10:06 PM

Greg. If you are referring to your 67 and 70 trucks with carbs then the ECM and closed loop do not apply.
Some will run the cooler 165 in the hot summer months and 195 in the winter months for better cab heat. I have done this also. As far as best temp stat for your trucks? It's which one the engine runs best at and which temp you feel comfortable with. Cooler intake temp makes more power. You may not actually feel any difference though. Normally I would say stay with the factory suggested temp stat. It's supposed to be just fine at that temp. If overheating occurs then the cooling system may need some attention.

09-11-2005, 10:06 PM	#5
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,681	Greg. If you are referring to your 67 and 70 trucks with carbs then the ECM and closed loop do not apply. Some will run the cooler 165 in the hot summer months and 195 in the winter months for better cab heat. I have done this also. As far as best temp stat for your trucks? It's which one the engine runs best at and which temp you feel comfortable with. Cooler intake temp makes more power. You may not actually feel any difference though. Normally I would say stay with the factory suggested temp stat. It's supposed to be just fine at that temp. If overheating occurs then the cooling system may need some attention. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross