You have to remember that redecking the block lessens the piston to valve clearance and it's very close to the bare minimum as is.
(Safe limit for deck or head milling is a combined total of .006" )
Also compression is raised slightly which on a hybrid is starting to play with fire if both quality octane fuel and custom chip tuning are not available. (around .2 or maybe .3 more CR for removing the limit)
My advice (if you really want to lose them by running a hybrid
) is to tap the holes and plug them with a hex plug. Loctite or JB weld on the threads.
