7point62fmj Posted February 26, 2006 Share Posted February 26, 2006 This is for a EA81 motor I have been reading through a few post and using the search fuction and have got mixed results so I figured I would just ask. How much have you shaved (decked) off your heads? And why did you pick that amount? I know if you take off too much you can not get your itake to fit. Soo lets hear it. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 27, 2006 Share Posted February 27, 2006 This is for a EA81 motor I have been reading through a few post and using the search fuction and have got mixed results so I figured I would just ask. How much have you shaved (decked) off your heads? And why did you pick that amount? I know if you take off too much you can not get your itake to fit. Soo lets hear it. Subaru max states .015" off the heads. That's what I took off mine. I've heard .020" is possible and the intake will still bolt on. Any more than that, and you *could* make the holes in the manifold a little bigger and get it to work, but you are decreasing the sealing area between the intake runner and the coolant passage. Even stock this is a weak point, so I wouldn't make it any smaller than it has to be. If you want more comp. then you can install SPFI pistons, or EA71 pistons for a little bit. I calculated it out once, and with the heads decked .015", and EA71 pistons you should be around 9.3:1 - 9.5:1 or so. SPFI pistons would give you 9.5:1 with NO decking of the heads, probably close to 9.8:1 with the heads decked. GD Link to comment Share on other sites More sharing options...
Qman Posted February 27, 2006 Share Posted February 27, 2006 I personally have built two EA81's in the lsat couple of years. Both run 1600 pistons, webers, large Delta cams and one was shaved .015 and the other .020. I have had no issues with either. Both generate good power and torque through out the power band. Link to comment Share on other sites More sharing options...
7point62fmj Posted February 27, 2006 Author Share Posted February 27, 2006 Well then this may sound nuts.. I got off the phone with stratuss (Mykal) today. I was talking to him about the dual carb setup he wants to offer me as well as info about the cam. Any who.. He deckes his at .05 to get a 9:1 comp roughly he does not how ever use any thing but the ea81 pistons. He said I would have to redrill the intake. He also said if I wanted to I could mail them to him (my heads) and for $250.00pr a head he would deck them and give them a three angle job. I asked him is .05 alot and he said no.. that it works fine as long as you have a good coolant setup and that he builds these all the time. Link to comment Share on other sites More sharing options...
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