Big Block Operating Temperature Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

78SilveradoSWB · 07-01-2003, 04:06 PM

Is 225 degrees F. too high as a normal operating temperature for a 454 Big Block engine?

**Captkaos** · 07-01-2003, 05:35 PM

That seems a little high to me. Mine stayed around 180-190 in the summer.

Txstruck · 07-01-2003, 06:50 PM

I had a chevy dealer tell me the norm for a 454 was 210 degrees. I had a 90 chevy dually 1 ton with a 454 i thought was running hot so i changed the thermo and flushed the cooling system and nothing changed so I asked them and thats what they said.

Cole's 87 · 07-01-2003, 08:23 PM

I'm with Kaos, I keep mine @ 180. But when I pull something it tends to run 195-200 .

Most fuel injected engines fuel & timing maps are based around 210. I'm probably wrong but I think a thermostat over 195 for a carb engine is too hot

07-01-2003, 04:06 PM	#1
78SilveradoSWB Senior Member Join Date: Apr 2002 Location: Beaverton, OR Posts: 1,615	Big Block Operating Temperature Question Is 225 degrees F. too high as a normal operating temperature for a 454 Big Block engine? __________________ Mitch 1978 Chevrolet Silverado C 10 454 BB, TH400

07-01-2003, 05:35 PM	#2
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	That seems a little high to me. Mine stayed around 180-190 in the summer. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

07-01-2003, 06:50 PM	#3
Txstruck Registered User Join Date: Nov 2002 Location: Dallas Posts: 459	I had a chevy dealer tell me the norm for a 454 was 210 degrees. I had a 90 chevy dually 1 ton with a 454 i thought was running hot so i changed the thermo and flushed the cooling system and nothing changed so I asked them and thats what they said. __________________ Steve 86 K30 4x4 6.2L Diesel\TH400\NP208 - 14bolt FF rear w/detroit locker and Dana60 front w/detroit locker- both with 4.56 gears "Runs on Mud"

07-01-2003, 08:23 PM	#4
Cole's 87 Registered User Join Date: Nov 2002 Posts: 272	I'm with Kaos, I keep mine @ 180. But when I pull something it tends to run 195-200 . Most fuel injected engines fuel & timing maps are based around 210. I'm probably wrong but I think a thermostat over 195 for a carb engine is too hot



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