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Old 01-25-2019, 09:58 PM   #51
garyd1961
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Re: wierd cooling system problem noise ?

Whatever works, I'm glad you got right. Your way should be really good for an AC truck with the cut-off valve in the line. Here is a picture of mine before I installed a new heater core and plumbed it in. It's still the same except now the water runs through the heater core and back to the pump.
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Old 01-25-2019, 10:10 PM   #52
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Re: wierd cooling system problem noise ?

I got the same setup as k30. Vortec heads and serpentine drive. I never had any problems. This thread made me think so I did some investigating. The ONLY time I don't have flow thru the block/pump is when the thermostat is CLOSED AND the A/C is ON! That's because I have Vintage Air and it uses a heater block off valve that closes of the heater core when the AC is on. For that one rare occasion, I went ahead and installed a bypass hose (see pic). Kept it simple-less than $5 in parts. Problem solved.
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Old 01-25-2019, 11:36 PM   #53
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Re: wierd cooling system problem noise ?

sun soaked . . . same rpm intake and arp bolts no less and temp sender in the bypass port .

i guess i am the unlucky guy the first 2 didnt work good and it needed the bypass port direct to the intake .
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Old 01-25-2019, 11:50 PM   #54
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Re: wierd cooling system problem noise ?

Quote:
Originally Posted by sweetk30 View Post
sun soaked . . . same rpm intake and arp bolts no less and temp sender in the bypass port .

i guess i am the unlucky guy the first 2 didnt work good and it needed the bypass port direct to the intake .
I'll say it again... those hubcaps are bad luck. Take them off and send to me.
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Old 01-31-2019, 07:53 AM   #55
The Rocknrod
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Re: wierd cooling system problem noise ?

Check out this bypass pic from a 65 with a V8 board member cru_zn_29 owns:
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Old 01-31-2019, 12:26 PM   #56
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Re: wierd cooling system problem noise ?

nice pic .

i got my 90* and 45* barb fittings the other day . when my new intake shows up and gets installed i will post a few pics of the cleaner install and new intake setup i picked to feed the truck .
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Old 01-31-2019, 01:30 PM   #57
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Re: wierd cooling system problem noise ?

That engine is a 1965 model 327 (or 283?), using a bypass? Old style heads? Hello?
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Old 02-01-2019, 12:00 AM   #58
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Re: wierd cooling system problem noise ?

That factory bypass was used on mostly medium duty trucks back in the day but some light duty trucks came with them also.


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Originally Posted by The Rocknrod View Post
That engine is a 1965 model 327 (or 283?), using a bypass? Old style heads? Hello?
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Old 02-01-2019, 06:57 AM   #59
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Re: wierd cooling system problem noise ?

Good info. That's something I never realized, so it's not new for small blocks. Interesting.
I looked at 5 different 60's small block cast steel intakes on eBay they all have the bypass nipple attached. I never noticed that before.
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Old 02-02-2019, 12:07 AM   #60
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Re: wierd cooling system problem noise ?

The factory small block thermostat bypass you posted a pic of, actually uses a piece that installs under the thermostat housing which the bypass hoses attaches to, What you were seeing on those 5 cast iron intakes is likely the heater hose nipple.
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Old 02-02-2019, 05:23 AM   #61
The Rocknrod
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Re: wierd cooling system problem noise ?

Good info there, thank you,
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Old 02-03-2019, 12:43 AM   #62
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Re: wierd cooling system problem noise ?

Post #3 in this thread shows what I am talking about.

http://www.67-72chevytrucks.com/vboa...d.php?t=780199
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