What kind of HG did you use? Metal, OEM toyota, aftermarket fiber type? Did you surface the head? Did you use ARP bolts/studs? What did you torque the bolts too?
If you didn't surface the head, and/or if you used an aftermarket "stock" fiber style gasket, it may well be blown again. Same if you didn't up the torque to 85lb/ft.
Even the OEM Toyota HG won't hold much past stock boost on a properly prepared head and block.
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