Quote:
Originally Posted by NiSilS14
Time serts are better suited than just re tapping the block for m11s. m10 major diameter is still bigger than the minor diameter of m11, so unless the m11 rethreading is perfectly timed to the original threads, it'll end up with loose threads. There's a timesert kit available that will rethread a block for m11 time serts. Also with the higher clamp loads, the ARP provided washers will still cause head lift since the diameter of the washers are smaller than oem. ARP's 200-5098 insert washers will solve that. Apparently that is an issue with a bunch of different engines at higher clamping loads.
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Well it seems one should just skip M11 then, as M11 time serts are larger in diameter than M12x1.25 threads, and I know that 1/2in studs are really close to too big for the block and you can start running into wall thickness issues depending on core shift.
Good call on the washers, I've never put them in a KA head but we use them in the 4G63 platform.