The only head gasket I recommend for building a 7M, the cometic, TMS, and stock head gaskets won’t hold up to extra cylinder pressures because of their bead type design. If you aren’t going to you a HKS, I would recommend a OEM factory gasket over a bead type.
This HKS Stopper type is highly effective in sealing because it incorporates a stopper instead of a grommet or bead which can become weak over a period of time. The stopper type consists of the most number of layers of plates for a better seal. The better seal is caused by the stopper on top of the bead or grommet. The increased sealing capability is also due to a molded stopper ring around each combustion chamber. This stopper type is the most expensive of the three types of metal head gaskets.
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