Big Block Cooling? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Texasbigblock · 05-29-2007, 11:48 PM

so here's the deal, im running a 396 with big valve heads, edelbrock alum high rise air gap intake, holley 750 double pumper and mild cam in my 70 1/2 ton. Not to mention a th350 tranny (note:its not an overdrive

) and 3.73's in the back. Im sure this truck is gonna SCREAM at about 70 mph. Does anyone make an electric fan or does anyone know how many cfms its gonna take to cool this thing. I dont think ill have room for a regular fan and clutch along with a electric fan so i really need to be able to just run an electric fan alone......

GREASEMONKEY72 · 05-30-2007, 12:08 AM

put the manual fan on and put an electric pusher fan infront of the rad on a switch so you can turn it on when and if it needs it, or just run the pusher fan alone but i dont think its gona be at that high an rpm to have to worry about overheating it plus on the highway at 70 you should have plenty of air goin through the rad

**Yukon Jack** · 05-30-2007, 12:13 PM

My 69 K20 has with 4.56 gears and heavy 35" tires and an SM465 manual four speed. I don't have any overheating issues and my cruising rpm's at 60 mph are about 2,500. This is with a 1989 carb'ed 454 with a mild cam, stock peanut port heads and ceramic coated headers. I have a 195 thermostat, new 4 core radiator and an Eldebrock aluminum water pump. I haven't made a radiator shroud yet. I use a mechanical clutch fan and do have an auxilliary oil cooler in front of the radiator.

**Classic Heartbeat** · 05-30-2007, 12:22 PM

Lots of the guys here are running our Duel 12" electric fan assemblies here. I have them on both small blocks and big blocks myself. No overheating problems here. Here is a link to where you can find them on our website: http://www.classicheartbeat.com/radi...&__related.htm WES www.ClassicHeartbeat.com

rophle1 · 05-30-2007, 01:23 PM

I think you'll be fine with a regular fan. I have a 396 as well; with a new aluminum radiator, I don't have any heating problems. Just make sure your radiator, fan, and water pump are in good working order and you will be alright.

Longhorn Man · 05-30-2007, 02:46 PM

a mechanical clutch fan is all you'll need.

Texasbigblock · 05-30-2007, 06:45 PM

thanks, i guess im just gonna run the stock system with a 4 core rad. i can always add an auxillary fan later if it overheats. Right now i just have the pulley on the pump and dont have a fan/clutch or radiator in and it sure looks like its gonna be a tight fit!

**clay68c10** · 05-30-2007, 08:13 PM

Are you running an original short water pump? If so, the stock fan & clutch will fit. If you have the long pump you may not have enough room.

Texasbigblock · 05-30-2007, 10:24 PM

yea, its the short one........thank God

05-29-2007, 11:48 PM	#1
Texasbigblock Registered User Join Date: Mar 2007 Location: Texas Posts: 252	Big Block Cooling? so here's the deal, im running a 396 with big valve heads, edelbrock alum high rise air gap intake, holley 750 double pumper and mild cam in my 70 1/2 ton. Not to mention a th350 tranny (note:its not an overdrive ) and 3.73's in the back. Im sure this truck is gonna SCREAM at about 70 mph. Does anyone make an electric fan or does anyone know how many cfms its gonna take to cool this thing. I dont think ill have room for a regular fan and clutch along with a electric fan so i really need to be able to just run an electric fan alone...... __________________ -Scott- 1970 C10 shortbed 396 1969 C30 dually flatbed "Vidalia"

05-30-2007, 12:08 AM	#2
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: Big Block Cooling? put the manual fan on and put an electric pusher fan infront of the rad on a switch so you can turn it on when and if it needs it, or just run the pusher fan alone but i dont think its gona be at that high an rpm to have to worry about overheating it plus on the highway at 70 you should have plenty of air goin through the rad __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

05-30-2007, 12:13 PM	#3
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,684	Re: Big Block Cooling? My 69 K20 has with 4.56 gears and heavy 35" tires and an SM465 manual four speed. I don't have any overheating issues and my cruising rpm's at 60 mph are about 2,500. This is with a 1989 carb'ed 454 with a mild cam, stock peanut port heads and ceramic coated headers. I have a 195 thermostat, new 4 core radiator and an Eldebrock aluminum water pump. I haven't made a radiator shroud yet. I use a mechanical clutch fan and do have an auxilliary oil cooler in front of the radiator. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 Last edited by Yukon Jack; 05-30-2007 at 12:14 PM.

05-30-2007, 12:22 PM	#4
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,768	Re: Big Block Cooling? Lots of the guys here are running our Duel 12" electric fan assemblies here. I have them on both small blocks and big blocks myself. No overheating problems here. Here is a link to where you can find them on our website: http://www.classicheartbeat.com/radi...&__related.htm WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

05-30-2007, 01:23 PM	#5
rophle1 Registered User Join Date: Jan 2007 Location: Athens, GA Posts: 112	Re: Big Block Cooling? I think you'll be fine with a regular fan. I have a 396 as well; with a new aluminum radiator, I don't have any heating problems. Just make sure your radiator, fan, and water pump are in good working order and you will be alright. __________________ 1968 C10 Stepside 396 bored .030 TH400

05-30-2007, 02:46 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Big Block Cooling? a mechanical clutch fan is all you'll need.

05-30-2007, 06:45 PM	#7
Texasbigblock Registered User Join Date: Mar 2007 Location: Texas Posts: 252	Re: Big Block Cooling? thanks, i guess im just gonna run the stock system with a 4 core rad. i can always add an auxillary fan later if it overheats. Right now i just have the pulley on the pump and dont have a fan/clutch or radiator in and it sure looks like its gonna be a tight fit! __________________ -Scott- 1970 C10 shortbed 396 1969 C30 dually flatbed "Vidalia"

05-30-2007, 08:13 PM	#8
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,979	Re: Big Block Cooling? Are you running an original short water pump? If so, the stock fan & clutch will fit. If you have the long pump you may not have enough room. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

05-30-2007, 10:24 PM	#9
Texasbigblock Registered User Join Date: Mar 2007 Location: Texas Posts: 252	Re: Big Block Cooling? yea, its the short one........thank God __________________ -Scott- 1970 C10 shortbed 396 1969 C30 dually flatbed "Vidalia"

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