turbo1600 Posted October 26, 2017 Share Posted October 26, 2017 getting my 1998 outback dohc ej25 bored to 100mm , but i`ve mistakingly ordered sohc pistons with the 4 valve reliefs , my old dohc pistons have the square dish. i know i have to get 100mm head gaskets , but will i have to get thicker hg`s ? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 27, 2017 Share Posted October 27, 2017 Thinner head gaskets. Why are you boring it oversized? That's just a gigantic waste of time on an NA block. Get a new set of case halves or find a used set and have the main line honed. Cylinder walls are not a problem on Subaru engines, the main bearing clearances are the problem you need to address. GD Quote Link to comment Share on other sites More sharing options...
Gloyale Posted October 27, 2017 Share Posted October 27, 2017 uhg. 100mm? why? Your cylinder sleeves are gonna be paper thin now. On a phase I block? Now those tall barrels around the liner will be even more prone to vibration and losing Headgaskets. That engine won't last long. Quote Link to comment Share on other sites More sharing options...
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