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There are three different types of S14/S15 sr engines.
Zenki s14 sr have smooth casting on the front of the head.
Kouki s14 sr have heat sink fins cast into the front of the head.
S15 sr look identical to late model s14 sr, however they use valve cover bolts like p11/p12 sr20ve versus the stud / nut combination on earlier sr20det engines. The valve covers are also different because of the different coil packs (built in ignitor)
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