When these trucks were new... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 03-20-2018, 11:14 AM

Could you really take a brand new 402 truck and sit in 90F weather with the windows rolled up in traffic and the AC blasting and it wouldn't overheat?

According to old people I've talked to, no. The one guy I know that had an original big block Longhorn in the day say his would overheat if he did that.

Mine will creep and though it's never overheated, it would peg the gauge if I let it. I wound up adding an aux electrical pusher fan as a bandaid, but I'm really curious if they actually could do it when stock!

harpo231 · 03-20-2018, 11:40 AM

When mine was stock temp would rise but drop right away if revved up...

I've heard same as you so I think it's normal or not out of the question.....

Coley · 03-20-2018, 04:24 PM

Which begs the question....what drastically changed in the following years (73+) to cool the big block trucks vs. the 67-72 series?
bigger radiators?.....different water pumps?...or what?....noting that increasingly a lot more trucks had a/c, more weight to push, a 454 instead of 400....etc.

Coley

03-20-2018, 11:14 AM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	When these trucks were new... Could you really take a brand new 402 truck and sit in 90F weather with the windows rolled up in traffic and the AC blasting and it wouldn't overheat? According to old people I've talked to, no. The one guy I know that had an original big block Longhorn in the day say his would overheat if he did that. Mine will creep and though it's never overheated, it would peg the gauge if I let it. I wound up adding an aux electrical pusher fan as a bandaid, but I'm really curious if they actually could do it when stock! __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

03-20-2018, 11:40 AM	#2
harpo231 Registered User Join Date: Nov 2014 Location: Lincoln City DE Posts: 1,292	Re: When these trucks were new... When mine was stock temp would rise but drop right away if revved up... I've heard same as you so I think it's normal or not out of the question..... __________________ Stan 67 swb BLU MULE posted via flip-fone

03-20-2018, 04:24 PM	#3
Coley Registered User Join Date: Oct 2011 Location: Victoria, B.C Posts: 3,794	Re: When these trucks were new... Which begs the question....what drastically changed in the following years (73+) to cool the big block trucks vs. the 67-72 series? bigger radiators?.....different water pumps?...or what?....noting that increasingly a lot more trucks had a/c, more weight to push, a 454 instead of 400....etc. Coley __________________ ....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500

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