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I use -16 for the upper, -20 for the lower, and -10 for the heater.

The thermostat housings I have found are mostly -16, and the -20 stuff is a lot more money. All you need for the upper is -16.

I used -10 bungs soldered to the heater core.

I have pics if you're interested.
 

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The conversion is fairly simple.
The -number is how many 16th of an inch.
So -4 is 4/16" or 1/4"
And dash -16 is 16/16" or 1"

I thought the upper hose was larger than 1" and the heater hoses aren't they 2 different sizes.
 

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Registered
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4,457 Posts
The conversion is fairly simple.
The -number is how many 16th of an inch.
So -4 is 4/16" or 1/4"
And dash -16 is 16/16" or 1"

I thought the upper hose was larger than 1" and the heater hoses aren't they 2 different sizes.
The upper hoses on most race cars including Nascar are -16, so it's plenty big. The heater hoses can both be -10 even though stock rubber sizes of course are 5/8 and 3/4.


Eke, I will email some pics.
 
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