My Subaru WRX STIs Head gasket failed After 18 Miles?...

lol well, that sucks. On the bright side, we can get it fixed pretty quick.

This is one problem that has genuinely stumped me because the STi acts normal at times then other times the Tstat will not open. Logically the only thing I can think of is a bad block deking, bad Head decking, or the questionable head studs that I used when putting the engine together.

Shop Subaru Parts - www.Rallysportdirect.com use code SMEEDIA

Vacuum Bleeder Cooling System: https://amzn.to/3tMOX5b

Tools For The Garage:
Special Oil Funnel: https://amzn.to/3oeyiCq
Coolant Burping Tank: https://amzn.to/3iesMfn
3/8" Socket Seet: https://amzn.to/3uf2dLT
1/4" Socket Set: https://amzn.to/2XPEd5K
3/8" Impact Gun: https://amzn.to/3lYfO6q
3/8" Ratcheting Wrench: https://amzn.to/3ueQNYu
Batteries for those electric tools: https://amzn.to/3zQE5A5
Floor Jack: https://amzn.to/39KdE4y
Jack Stands: https://amzn.to/2WfVWCT
Gucci Screw Driver Set: https://amzn.to/3EXGTPN
Hook and Pick Set: https://amzn.to/3kJdeBJ