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Old 01-13-2006, 03:50 PM
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Two cooling questions

I have two quick cooling related questions.
1) Does it matter which way a thermostat is installed on a small block Ford engine? Does the pointed end need to face into the engine block or towards the radiator hose?
2) I just hooked up my new aluminum radiator but it did not come with a cap. What pressure (in lbs.) for the cap is standard for a slightly warmed over Ford 302?

Thanks for your help.

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Old 01-13-2006, 04:11 PM
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The heavy end of the thermostat goes toward the engine. This part needs to heat up before the thermostat will open.
The radiator should be rated for the cap pressure. I would use a 15-16# cap on a new modern radiator.
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Old 01-13-2006, 07:51 PM
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Doc here,

Onovakind67 Is correct, The "Tower End" or spring side needs to be pointed up to be correct...The other way is not just a job...It's an adventure...

As far as the cap goes beg, borrow or steal , (or as a last resort, rent one from auto~zombie) a pressure cap tester. Bring the system up to temp with it plugged in to the radiator cap housing on the radiator..whatever it reads on the gauge, get one in that range (15 to 22 lbs) for say 16 Lbs..you should be good.

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