390 radiator cap

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Dec 29, 2015 | 07:51 AM

john jamieson

Thread Starter

Cargo Master

Joined: Jul 2015

Posts: 2,063

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From: tucson

390 radiator cap

I have a '64 F-250 that a PO installed a 390 into. I just had the radiator repaired and need to replace the cap. The parts store sold me an 13lb rated solid top cap.
The old cap is 7lb rated and has the locking top. I believe the engine is from '72-'74. The truck does have a now non-working ac system. What rating should my rad cap be?
Thanks.
john

Jan 6, 2016 | 11:51 AM

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

Likes: 12

From: Ohio

Sounds like the previous owner put a light cap on it so it would not blow out the old radiator. the 13# sounds about right.

The locking tab is just an option. Doesn't need to be there. Just allows you to depressurize without turning the cap. Once you have the cooling system working properly you won't need to worry about removing the cap.

Jan 8, 2016 | 04:50 PM

MIKES 68 F100

Logistics Pro

Joined: Jan 2011

Posts: 4,762

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From: Antelope Valley ,CA

fyi get a STANT cap not the look alike that Autozone /pepboys sells those aren't worth peeing on

Jan 9, 2016 | 03:04 PM

69cj

Hotshot

Joined: Jul 2005

Posts: 13,834

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From: Middle Tn.

I purchased a Stant cap with built in thermometer on the top. Kinda neat to see what the rad. temp. is before opening her up.

Jan 13, 2016 | 06:29 PM

john jamieson

Thread Starter

Cargo Master

Joined: Jul 2015

Posts: 2,063

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From: tucson

Thanks for the replies. I may have to look for a Stant cap with the thermometer in it. That would also give a comparison to the temp gauge on the dash.

Jan 14, 2016 | 02:52 AM

jowilker

Fleet Owner

Joined: Jun 1999

Posts: 24,552

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From: Creedmoor, North Carolina

In the about 50 years that I have had a drivers license, I can't recall ever wanting to jump out pop the hood to see what the temp at my rad cap was.

John

Jan 14, 2016 | 07:51 AM