74 Cooling Issues
07-14-2018, 10:01 AM
#1
74 Cooling Issues
Guys new C3 Owner here and new to the forum. Not a complete newby to forums as a member of Stovebolt Chev trucks and Ford N tractors, but nevertheless I will probably unintentionally violate a few formal and informal rules here. First violation, not searching the forum for immense discussion of the same issue before as if you're the first person to have the issue. I did a search, and found the discussion on electric fans and a few tangents but not exactly my issue. Here's my deal. 74 original 350 has been bored/stroked to 383 with aluminum heads, headers and new intake by prior owner. Appears fan shroud has been cut in 1/2 during the motor rebuild, so the fan (w/clutch) is about 1/2" behind the shroud. None of the fan is within the shroud. I AM NOT A NUMBERS MATCHING GUY ! Live in S. Texas with too many days of 100 deg weather. Took my new 74 on a 50 mile stroll yesterday, she ran fine at 200 deg until I sat idling while fiddling with my GPS,then temps started climbing. Instantly cooled back down once underway and air moving through the radiator. Has factory air BTW. I would prefer not to add electric fans, but cannot have a vehicle that runs hot in my climate. How would you guys proceed?
Last edited by dalane; 07-14-2018 at 08:15 PM.
07-15-2018, 08:28 AM
#2
Team Owner
Member Since: Jun 2000
Location: Southbound
Posts: 38,928
Likes: 0
Received 1,468 Likes
on
1,247 Posts
Cruise-In II Veteran
07-15-2018, 09:59 AM
#3
Le Mans Master
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 6,879
Received 2,112 Likes
on
1,622 Posts
Unofficial Quotes:
A few degrees in timing will change a few degrees in temps.
Overheating at idle is a "air" circulation issue.
Overheating at speed is a "water" circulation issue.
With the fan outside of the shroud you are only getting 50-75% efficiency.
A few degrees in timing will change a few degrees in temps.
Overheating at idle is a "air" circulation issue.
Overheating at speed is a "water" circulation issue.
With the fan outside of the shroud you are only getting 50-75% efficiency.
Last edited by HeadsU.P.; 07-15-2018 at 10:04 AM.
The following users liked this post:
Peterbuilt (07-15-2018)
07-15-2018, 10:52 AM
#4
Race Director
Start with a good aluminum radiator and new shroud.
Install a good high performance, high volume water pump like the edelbrock or others.
Look at anything that you can do to pull more air through the radiator at slow speeds or stopped like removing the front license plate and bracket and installing a center grille, replacing the front air dam.
Install a good high performance, high volume water pump like the edelbrock or others.
Look at anything that you can do to pull more air through the radiator at slow speeds or stopped like removing the front license plate and bracket and installing a center grille, replacing the front air dam.
The following users liked this post:
dalane (07-15-2018)
07-15-2018, 11:55 AM
#5
Drifting
check the fan CLUTCH.. its probably not holding.anymore... . get a good Hayden Severe Duty Thermal Clutch and it will make a huge difference... AND only cost you about $40
Last edited by fishslayer143; 07-15-2018 at 11:56 AM.
07-15-2018, 03:25 PM
#6