440 Header/Head Mounting Bolt

I think I'd try 33IMP's suggestion. If that don't do it you might check the head for a possible crack from over torque.

KOZ45 said

I would guess the current bolt threads are easily 1"

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I see TTI uses 1" bolts where as Schumacher uses studs, maybe still available.

B/RB Tri-Y Headers (engine-swaps.com)