So I spun a bearing on my S13 and I found an S14 short block for cheaper than rebuilding the S13 block. I've done the research and know that the S14 block is compatible with the S13 head. I have to drill, tap and plug one of the oil galley's on the S14 because they come with VVT and the S13 doesn't. I'm going to get a metal Apexi head gasket, but I'm not sure which to get... 86mm .8mm 86mm 1.1mm 86mm 1.5mm 86mm 1.8mm 87mm .8mm 87mm 1.1mm 87mm 1.5mm 87mm 1.8mm I haven't done anything to the internals, or changed bore size or anything like that. I've done tons of searching, but I can't find anything...maybe I'm just a horrible searcher. I'm pretty sure the stock bore on the S14 is 86mm, and 1.1mm is the stock head gasket thickness...If someone can confirm that, it would be much appreciated. Since this is my drift car and it will be high revving a lot of the time should I go a little thicker with the gasket for a lower Comp ratio? Maybe the 1.5? I'm pretty new to Nissan stuff, any help is appreciated. Thanks.