The HG blew on my '82 EA81 and I'm seriously considering dropping in some EA82 SPFI pistons to bump the compression while its apart. The EA81 is in a 90 loyale with the 90 SPFI system on it, so I think it would be perfect for the setup. I'm also mulling over taking some more off the heads to get the compression a little higher. With SPFI pistons I'm hearing it will be about 9.1-9.2/1...how high can I go on 87 octane?...maybe spfi pistons and .010" off the heads....or leave the heads alone?...I know one guy I wheel with has .020-.025" off the heads and ea71 pistons and he needs mid grade at a minimum. I'm not looking to go crazy, I just figure...why I have it apart...why not..
I'm not going EJ in this car yet..
I've never considered putting new pistons in a motor without boring over and getting brand new pistions/rings/etc., but having been around subarus awhile, I've learned you can get away with alot. What exactly can I get away with? can I use old pistons? Assuming I get new pistons and rings(stock sized), do all I need to do is grab a glaze hone and a ridge breaker from oriellys and drop them right in??
I used to be an auto machinist so it was always drilled into my head to "do it right" and not half-rump roast it, but since then I've learned there's a lot of grey area in between. Im also tight on cash...