studioti Posted February 15, 2011 Share Posted February 15, 2011 Any help is much appreciated. I just got hold of a P90 that i'm going to drop off to the shop to have it cleaned, ported, etc. I am also going to do the "shave .080" compression mod. Only problem is that this head already had shims in it that were .015". Instead of just subtracting this from .080 and "assuming"... I'd like to know the STOCK OEM SPEC THICKNESS of a P90 head. This way i can measure the head in its current state and tell the machine shop a specific amount to shave. Thank you!!! Quote Link to comment Share on other sites More sharing options...
Derek Posted February 15, 2011 Share Posted February 15, 2011 According to Pete in this thread specs The stock head height is around 107.9mm (4.248"). So it looks like they shaved it 0.020", which is pretty common since that is what cam tower shims typically available as. Maybe you were off a little when you measured the shims? 4.248 - 0.080 = 4.168 (what you should shave it to). I'm sure you already know that there is a lot more to this mod than just shaving the head. Pete Which is what mine measured. Derek Quote Link to comment Share on other sites More sharing options...
blue72 Posted February 15, 2011 Share Posted February 15, 2011 That's what I've always read too, uncut it should be 107.9mm. Quote Link to comment Share on other sites More sharing options...
studioti Posted February 15, 2011 Author Share Posted February 15, 2011 Thanks. Those numbers match up with other searches i have dones as well. My P90 seems to already have been shaved .020, but i have a p79 as well that is exactly 4.248 awesome, thanks for the help fellas. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted April 17, 2011 Share Posted April 17, 2011 (edited) My P90A measures 4.248. My E31 measures about 4.255 Edited April 17, 2011 by cygnusx1 Quote Link to comment Share on other sites More sharing options...
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