Freeze plug shooting out

[$uperstang]

So my brother in-law builds a badass 514 stroker for his truck. Takes it out and at about 6500 rpms a freeze plug shoots out! Puts new one back in and secures it and a few days later one on the other side shoots out at 6500-7,000 rpms.

WTF?

Why is this happening?

 

[RSWANNABE]

It sounds like the fit isn't quite right on that hole.
Or it's building an extreme amount of pressure in the cooling system.

 

[adam351]

pete call me tomorrow ,tom i had one do that years ago

 

[Instigator]

They make a thin lip (cheapo, Auto Zone, Advance ect...) and a thick/wide lip
The thin lip ones dont seat very well and will pop out, This happened to my brother on a 501 BBF, put the thick lip in and never happened again

 

[Instigator]

Clearly a better seat with the thick lip (As I call it) Hope this helps

Thin lip

Thick lip

 

[$uperstang]

Thanks guys.

Tom I will give you a call.

 

[igotaneed4speed]

Tap and use threads ins.

 

[Anthony]

them taps are $150 and up i beleive. but there was a place that rented them and sold the kits. pay up front, return in good shape and they refund the tap rental monies