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Topic: BBC OVER HEATS

in Forum: C3 Engines


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



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



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



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

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