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#1
September 30th, 2016, 07:38 PM
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Correct Rad Cap?
I want to make sure I'm running the correct radiator cap. What does the group consensus call for with s 305 A V-6 mated to a hydra-matic? Part number is good as well.
Thanks Jake 
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#2
October 1st, 2016, 04:25 PM
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Re: Correct Rad Cap?
When I got my '60 3/4 with a 305A in 1970, it had a cap with a broken spring, hence no pressure in the cooling system.
I am still using that cap with no ill effects, in hot or cold weather, that I can tell.
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#4
October 1st, 2016, 10:47 PM
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Re: Correct Rad Cap?
IIRC a 7lb cap should be factory. At least that's what I've got in my notes.
__________________
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#6
October 2nd, 2016, 01:19 AM
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Re: Correct Rad Cap?
I found a reservoir from a toyota corolla fits perfectly between the radiator and the battery area. No bolts needed, its sized perfectly to pressure fit right in there. Holds a good amount too. No symbols or anything, it's just a white tank.
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#7
October 2nd, 2016, 02:03 AM
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Re: Correct Rad Cap?
I have 7lb cap as well and I just got one of those generic over the counter units at AutoZone.
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1961 GMC Suburban 305A Overdrive 1962 GMC Utility 305D
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#8
October 2nd, 2016, 05:26 AM
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Re: Correct Rad Cap?
I have a 13 pounder on my 305E. Seems to work fine.
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"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
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#9
October 2nd, 2016, 01:23 PM
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Re: Correct Rad Cap?
[
What year corolla? QUOTE=FetchMeAPepsi;63894]I found a reservoir from a toyota corolla fits perfectly between the radiator and the battery area. No bolts needed, its sized perfectly to pressure fit right in there. Holds a good amount too. No symbols or anything, it's just a white tank.[/QUOTE]
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#10
October 2nd, 2016, 07:21 PM
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Re: Correct Rad Cap?
Quote:
Here's the post about it with a pic of it installed. http://6066gmcclub.com/showthread.ph...yota#post48940
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