Home page
SPONSOR AD

Support our Vendors!  |  Advertise Here

Topic: BBC OVER HEATS

in Forum: C3 Engines


Already a Member?
Login
Not yet a Member?
Register for Free!

BBC OVER HEATS (1/15)
 2/4/25 6:10am
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

Engine time & carb set good. Easy start, no ping, no dieseling.

☆ please read atrachment for further!

• your thoughts & suggestions are appreciated.

Our Sponsors help support C3VR
Re: BBC OVER HEATS (2/15)
 2/4/25 11:18am
F4Gary
Standard Member
Send Private Message

Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport convertible.


Joined: 8/26/2006
Posts: 1482

Stock or higher flow water pump?  Once you get moving down the highway does it cool back down to normal?

Does your electric fan have a shroud or is it just stuck on the radiator?



|UPDATED|2/4/2025 12:18:08 PM (AZT)|/UPDATED|


______________

   

Re: BBC OVER HEATS (3/15)
 2/4/25 11:46am
Mike M.Gold Member
Gold Member
Send Private Message

New Brighton, PA - USA

Vette(s):
1982 Corvette


Joined: 4/29/2024
Posts: 2

Radiator hose collapsing restricting flow. An old hose will lose its' form strength or the support spring inside the hose is missing, although some hoses don't have them.

Thermostat not working properly, stuck partially open or shut. Remove thermostat, put it in pan and boil it to see if it opens correctly. 

Re: BBC OVER HEATS (4/15)
 2/4/25 2:03pm
F4Gary
Standard Member
Send Private Message

Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport convertible.


Joined: 8/26/2006
Posts: 1482

By the way, my LT-1 can't sit in rush hour traffic with the a/c on during out hot Texas summers.  Once it gets to 220-230 I shut it off until I can get moving again.  Then it will come back down to 190ish.  I have a DeWitts aluminum rad.with stock cooling fan and stock water pump (might be my problem).



|UPDATED|2/4/2025 3:03:21 PM (AZT)|/UPDATED|


______________

   

Re: BBC OVER HEATS (5/15)
 2/4/25 12:49pm
knotacare
Limited Member
Send Private Message

Newark, DE - USA

Vette(s):
1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1967 Dodge Coronet, 340 stroker to 406, Dana 60


Joined: 7/26/2004
Posts: 468

Well first I would get rid of the 50/50 mixture. Use distilled water and only enought anti freeze to keep corrosion down ,say around 20%. Then add a can or 2 of water wetter.  Make sure all the air around the radiator is blocked off so all air has to go thru the radiator.  Decrease your timing a degee or so will help also.  A good spoiler will help too  (this helps the most when moving).  I've got a 454 and it runs 172-180 all day.  I have a flex fan on this one with a stock shroud.



______________

                                               

Re: BBC OVER HEATS (6/15)
 Yesterday 10:05am
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

Stock water pump, no factory shroud, yes cools back down in motion.

Re: BBC OVER HEATS (7/15)
 Yesterday 10:06am
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

Stock water pump, no factory shroud, yes cools back down in motion.

Re: BBC OVER HEATS (8/15)
 Yesterday 10:06am
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

Thanks for your comments.

Re: BBC OVER HEATS (9/15)
 Yesterday 10:09am
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

My 350/330 had overheating problems. I was using full synthetic motor oil. I changed my motor oil brand to Rotella 15-40. T4.  It resolved my issue.  Temp stay 180° not 200-210°.

Re: BBC OVER HEATS (10/15)
 Yesterday 10:10am
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

All new replacements, appear ok!

Re: BBC OVER HEATS (11/15)
 Yesterday 10:50am
F4Gary
Standard Member
Send Private Message

Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport convertible.


Joined: 8/26/2006
Posts: 1482

Sounds like your fan needs some sort of shroud so it pulls air through the whole radiator and not just the circular area it covers.

Possibly a dual fan + shroud set up.



______________

   

Re: BBC OVER HEATS (12/15)
 Yesterday 11:36am
Mike M.Gold Member
Gold Member
Send Private Message

New Brighton, PA - USA

Vette(s):
1982 Corvette


Joined: 4/29/2024
Posts: 2

I agree with F4Gary.  That would be my next thing to try.

Re: BBC OVER HEATS (13/15)
 Yesterday 11:51am
F4Gary
Standard Member
Send Private Message

Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport convertible.


Joined: 8/26/2006
Posts: 1482

This is probably the best set up.

https://www.dewitts.com/products/spal-dual-fan-kit



______________

   

Re: BBC OVER HEATS (14/15)
 Yesterday 7:22pm
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

Thanks for the comments.

Re: BBC OVER HEATS (15/15)
 Yesterday 7:22pm
Phil's-Stingray
Standard Member
Send Private Message

OKLAHOMA CITY, OK - USA

Vette(s):
1975 L48 Corvette Stingray convertible with hardtop, modified & restored, new medium cloisonne paint, interior, 350 cid 330 hp with TH700R4 automatic transmission 3:08 differential ratio, all power & ac and the underside. A very nice touring car.


Joined: 1/12/2020
Posts: 43

Thanks for the comments.

Our Sponsors help support C3VR