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07-09-2005, 01:59 AM
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#1 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,354
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What pound size radiator cap
What pound size radiator cap should I go with on a stock 350 with a brand new 3 core radiator?
Thanks ...
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 Last edited by skokie; 07-09-2005 at 02:13 AM. |
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07-09-2005, 02:25 AM
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#2 |
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Senior Member
Join Date: Jan 2002
Location: Perrysburg, Ohio, USA
Posts: 409
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You could go with a 15lb like what came stock with the truck. But if you still have a older heater core I'd go with something between 10 to 7 1/2 lb unit. Just to be on the safe side.
 Latter Tom.
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'91 suburban 350 TBI - R 700 4 new daily driver '72 Cheyenne Super 49,000miles 350/350 frame up resto w/ matching numbers. |
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07-09-2005, 11:15 AM
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#3 |
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~Rest In Peace~
Join Date: May 2005
Location: CALIFORNIA NOR CAL
Posts: 9,707
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16 lb cap
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is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex |
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07-09-2005, 11:43 AM
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#4 |
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Senior Member
 
Join Date: Mar 2000
Location: Saskatoon,SK,Canada
Posts: 2,476
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You really don't need anything more than an 11 lb cap. If you do the math on boiling points at pressures you will find that you are overheating the engine before you are boiling the coolant over with an 11 lb cap. Most will probably get away with the 7 lb cap. Less pressure means less stress on your cooling system.
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Saskatoon, Saskatchewan Canada |
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07-10-2005, 01:46 AM
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#5 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,354
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The parts store was out of 11 lbs caps but they had a 13 lbs stant one so I grabbed that one. I put it on tonight. Didnt really notice a difference but I did notice that my antifreeze is a dark green. Must be time to change it.
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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07-10-2005, 09:15 AM
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#6 |
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PROJECT 7DEUCE
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
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I run an 8 pound cap and all is well..
__________________
GO BIG GREEN  GO DUCKSMEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
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07-10-2005, 09:52 AM
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#7 |
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Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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I've always ran 13lb caps, no problems ever (been driving 26 years)
 (yeah, I'm old) 
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