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If you bore out any engine, I recommend a thick head gasket. When you bore cylinders, the space between the cylinders becomes very thin. Using a thick head gasket makes the head gasket much stronger at the spaces between the cylinders. In addition, the resulting lowered compression ratio allows you to run more boost.
If you're going to delay boring and sleeving, I at least recommend a block guard, but be forewarned that a block guard is in no way an adequate alternative to sleeving. The good news? A good buddy of mine is running with just rods, pistons, and a block guard- and 18 psi.
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