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Originally Posted by drift freaq
the s14sr head on a s13sr block, can possibly have incompatabilities,due to water galleries and oil galleries being different from casting to casting. i.e. it may not work and if these parts are expensive to begin with it would be an expensive lesson learned.
It is not a direct perfect bolt on situation. There may be a work around, but we are talking generational design differences in the castings.
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if im not mistaken, HG is same from s13-s15 sr's. which would mean oil/water galleys are same. timing chain tensioner settup is slightly different, but im told are interchangeable (guides are in the block (s13 parts) and tensioner is in head(s14 parts)).
on a side note, z32 pistons raise CRatio to about 9:1 i believe. friend did his and its not very impressive.