REMFLEX GASKETS BLOW OUT

toolmanmike said

Could be a head or flange warp issue. I always cut the flange between the front and rear ports so each tube (or both in the middle) are independent of the others.

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I agree with the cutting and separating the three sections, also check the lengths of the bolts or depth of the hole in the head. Possible bolt or bolts are bottoming out. If all else fails, try doubling up on the gasket. Not the metal type, but the Fel-Pro or similar gasket.