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03-21-2020, 06:59 PM | #1 |
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Join Date: May 2010
Location: West Salem, Wi.
Posts: 281
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Radiator cap pressure AV8 build
Maybe a dumb question but what pressure cap should I be running on my mildly built flattie using a new aluminum radiator? Thanks
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03-21-2020, 07:52 PM | #2 |
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Join Date: Sep 2016
Location: sydney australia
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Re: Radiator cap pressure AV8 build
depends on a lot of things, hose quaility , how long ago was the engine assembled and what gaskets where used , do you have a heater [remember its a radiator just works in revese] how old is it and when was it last looked at plus lots of others with this in mind seven pound is generaly a safe bet but with modern hoses [2ply] modern gaskets updated heatercore 15 psi + is not unreasonable
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03-21-2020, 07:59 PM | #3 |
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Join Date: May 2010
Location: Masterton, New Zealand
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Re: Radiator cap pressure AV8 build
Yeah, but the water pumps in our old fords don't take that sorta pressure....Does your AV8 even need a pressure cap? I'd try for the least amount and go from there....
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03-21-2020, 08:14 PM | #4 |
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Location: u-rah-rah-Wisconsin
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Re: Radiator cap pressure AV8 build
I'm using a 7 pound cap on a fresh rebuild. No leaks.
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03-21-2020, 10:55 PM | #5 |
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Location: North Pole, Alaska
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Re: Radiator cap pressure AV8 build
I run a 7 lb on mine as well. Works great. Just keep in mind that your antifreeze is going to find its own level so if you fill the radiator to the top, it might leak out a little bit but don’t keep filling it because it will be OK
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03-22-2020, 09:31 AM | #6 |
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Re: Radiator cap pressure AV8 build
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03-22-2020, 02:17 PM | #7 |
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Join Date: Nov 2012
Location: Wichita KS
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Re: Radiator cap pressure AV8 build
Really no need to use a high pressure cap in the temperature range that flatheads run in. Sounds like your headed in the right direction, 185-195 is a great heat range.
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