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11-07-2011, 01:30 AM
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#1 |
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Registered User
Join Date: Jan 2011
Location: Glendale, AZ
Posts: 3,178
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quick question
What is the correct pressure rating for a radiator cap on a stock 71 350?
Also how bad is it if you are running with a cap that is lower in pressure than what is required? Thanks. |
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11-07-2011, 01:44 AM
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#2 |
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Account Suspended
Join Date: Sep 2010
Location: hingham ma
Posts: 1,721
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Re: quick question
iirc the cap is 15psi.. might be 7 tho.. mine is 15
a lower cap will just lower the boil point of the coolant.. |
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11-07-2011, 05:26 PM
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#3 |
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Registered User
Join Date: Jan 2011
Location: Glendale, AZ
Posts: 3,178
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Re: quick question
Everyone else got any info on this.
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11-07-2011, 05:36 PM
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#4 |
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Registered User
 Join Date: Jun 2010
Location: Eustis, FL
Posts: 124
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Re: quick question
For some reason 13 sticks out in my head.
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11-07-2011, 06:09 PM
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#5 |
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Old Duffer
Join Date: Mar 2003
Location: Maine
Posts: 1,822
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Re: quick question
I agree with all of the above......13lb to 15lb, and for every lb of pressure you add, you increase your boiling temp three (3) degrees.
__________________
'68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve." |
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11-07-2011, 07:39 PM
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#6 |
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Senior Member
Join Date: Feb 2001
Location: Ridgecrest. CA, USA
Posts: 1,715
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Re: quick question
I just had my 4 core redone in RENO NV at A-1 radiator shop and he went out of his way to tell me that I should be using a 16 PSI or higher. I asked him is it that way for SB and BB motors and he said it should be standard for the use of 4 core radiators. I hope this helps you.
R/ Billy
__________________
Billy   1970 GMC Sierra Grande 402/TH400 (Longhorn)14 years and counting rebuild! 1975 (Build) Chevrolet SWB 4X4 350 SB Lifted 6 inches 1970 Ford F250 Ranger 390 BB 2010 Ford Super Duty F250 XLT W/4 inch lift kit and Pro Comp Tires Hub Cap Freak!    I need another truck like I need another hole in the head!I'M IN THE MARKET...AS IT WERE! |
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11-07-2011, 09:06 PM
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#7 |
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Registered User
Join Date: Jan 2011
Location: Glendale, AZ
Posts: 3,178
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Re: quick question
Helps me alot. Thanks for all the input. The PO of my truck put a 7 PSI cap on it. I am always running hot and losing water thru the overflow after long trips. I think the correct PSI may solve my problem. Thanks again.
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11-07-2011, 10:06 PM
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#8 |
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Registered User
Join Date: Nov 2001
Location: Old Bridge,NJ
Posts: 838
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Re: quick question
I have a 14lbs Stant Lev-R-VenT on my 4 core radiator all for my L6-250 350 Turbo Auto Trans. Thats what the man at Fingers Radiator Shop recommended.
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11-11-2011, 10:21 AM
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#9 |
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Registered User
Join Date: Nov 2001
Location: Old Bridge,NJ
Posts: 838
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Re: quick question
I forgot to mention my four core rad came out of 69-70 pick-up v/8 350 -350 auto trans with 14lbs cap , it all looked origenal.
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