Came along your site here while doing some researching. Decent little site with decent info, thank you!
I’ve been researching in regards to try and determine what folks are doing for a head gasket when they get a K20Z3 bottom end sleeved which removes the coolant diverter item in the block and are intending to run the K20Z4 (RSP) or even the K20Z3 head? I have not yet been able to find any text yet referring to this however based on text relating to head swaps and Frankenstein builds it would possibly suggest that one would use a K20Z3 head gasket as it matches the head and maybe thats not ideal but the best option. I would love to hear from anyone who has any solid info regarding this specific combination.
You would want to stick with a Z3/RBC or Z4/RSP headgasket with a proper bore size and also retain the use of the coolant diverter as well. The diverter works in unison specifically with that K-series head type (RBC/RSP) unlike the K20A/A2/A3/Z1 PRB head that does not require one.
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