freeze plugs under head

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if you want to go your own route, 15/16 drill and 3/4" NPT.

Dont go too deep as said.
 
Here's a few pics of the Dr. P Tap.....



Don't ask the size cause I don't know...not on there....Straight threads though...The plugs are tappered..


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I purchased the kit, and I am happy with what I got. The tap is a quality piece (though it looks different then the one Dave pictured), arrived on time, with what I figure is a fair price. I have better things to do then recreating wheels...

Alex, any chance on just being able to buy just the plugs? I have more then one truck... PM me if you want.

Paul
 
paulb said:
I purchased the kit, and I am happy with what I got. The tap is a quality piece (though it looks different then the one Dave pictured), arrived on time, with what I figure is a fair price. I have better things to do then recreating wheels...

Alex, any chance on just being able to buy just the plugs? I have more then one truck... PM me if you want.

Paul
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Technically we only sell it as a kit so we don't get tech calls from people that bought the wrong tap and stripped it out and what not and expect us to warranty the stuff or even buy them a new cylinder head. Crazier requests have been made believe it or not.

Buuuuut, since you already have the right tap from us, I'll bet we can help you out. PM or email me if you want to do this.
 
zstroken said:
Keep you from blowing the plugs on the 24V that are under the valve cover.

Coolant in the oil is bad!
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They blow from pressure? What causes high coolant pressure? How common is it?
 
kipo said:
They blow from pressure? What causes high coolant pressure? How common is it?
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Pressure, Yes.....

Created by more rpms, power, etc...

Or improperly installed plugs....

Or just time I guess..

But in my case, im sure it was simply my typical bad luck....Or paying for previous sins of some sort or another...


Point is, Why ask Why!!!!!

Just Call Dr. P and live knowing that you added that bit of insurance and sleep better at night...
 
I went through the "do it yourself" process, I did find the same size metric plugs and tap, believe me, just buy the kit!!! The tap alone was 80 or 100 dollars, and the cheapest I could find the plugs was IIRC 12 dollars apiece. Big Swole was very helpful in answering all my questions about this, I will tell you up front that you will recieve a straight thread tap and tapered plugs. The tap will not go deep enough into the hole to create straight threads, just enough to get a good cut for the tapered plugs to screw into. I went nuts when I saw a straight thread tap, but don't worry, just tap them and put the plugs in. My head has been on since about Christmas, and I've had the valve cover off several times to lash valves, they don't leak a drop. My two cents..... Thanks again Swole!
 
My personal opinion on what blows these plugs. Rapid temperature change and pressure.

Building heat on a cool truck, the head and freeze plugs heat up, then as soon as the thermo opens, the little plug constricts and pop, out goes the plug. Once I red loctited mine in as they blew I never had another one pop. Than and I made sure the thermostat had cycled.
 
I used to use permatex sleave retainer on mine, but I still worried about them. The ones under the valve cover are not the most likely to blow, but typically cause the most damage when they do. Not from the plug itself but from the coolant in the oil.

The material that the plugs are made of, do not expand at the same rate as the head. As time goes along, they do work loose. The hotter the head gets, the faster they will work loose. The other thing is that the passages through the head gasket that the water in the head has to flow through are very small. Especially in the front part of the head. End result lots of hot water with no place to go.

Paul
 
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