Are you sure you need to offset your exhaust guides by 1.10mm sounds like a lot of offset with 46 and 37.5mm valves, that is equivalent to 45.4mm and 38.1mm, GRP2 inlet and GRP1 exhaust, what cam are you using and what is the valve lift at the point where both valves have equal valve lift?
I imagine offsetting the exhaust valve 0.50mm away from the inlet along the length of the engine would create room for a 47mm inlet / 37mm exhaust combination
Hmm, maybe there is an issue with using a 1600 head (and a cam with high overlap) with its 2mm longer valves being closer to each other, like a 2.0 head and both valves at 2mm lift if you know what I mean, if this is true it would make a pretty large difference to overlap clearance with long duration cams + big valves over GRP1 size
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