No its very simply fitting the 20 valve head on to the gze block i have just finished that setup. You need to source a 20 valve head gaskit they are easy enoung to find and you need to use the 20 valve timing belt. Where are you getting the 20v head from? is it with a full engine? if so why dont you transfer the internals from the gze block into the 20 valve block.
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