Samurai7one Posted February 12, 2015 Share Posted February 12, 2015 (edited) So, I got a couple of parts motors (L28s) Ive been sitting on and waiting (3 years) to get to a point in my life where I can start to build my motor. I guess I have reached that point, so I have started to tear down the two motors. I have two L28s, one has a spun bearing BUT, it also has a wealth of desirable parts on it. Such as: a Kameari timing chain tensioner, adjustable cam gear, lightweight flywheel, cast aluminum oil pan, flat top pistons, and what looks to be reworked or like new P90 head. Because of the specific parts this motor has on it, I am expecting that the head was probably shaved in order to increase the compression ratio. Why would anyone put all of those parts on a NA motor and not spend a few dollars to shave the head (maybe future turbo plans)? So I guess what I am looking for is an easy way to determine if the head has been shaved. I know I can CC the combustion chamber, but is there a more simple method, such as measuring the height of the head itself? Pictures are attached, maybe some of you guys can just take a look at the chamber shape/size and tell. Thanks in advance! Edited February 12, 2015 by Samurai7one Quote Link to comment Share on other sites More sharing options...
NewZed Posted February 12, 2015 Share Posted February 12, 2015 , but is there a more simple method, such as measuring the height of the head itself? That seems to be the method. The number is out there somewhere, I've seen it. If you post your number someone can probably tell you if it's shaved. Quote Link to comment Share on other sites More sharing options...
Samurai7one Posted February 12, 2015 Author Share Posted February 12, 2015 I measured roughly 108mm. sorry I only have a small metric caliper & it only goes to 100mm so I had to split the measurement. I know...Its so lame. 108mm = 4.25197" I promise to buy some decent measuring tools soon. Quote Link to comment Share on other sites More sharing options...
warcmalla Posted February 12, 2015 Share Posted February 12, 2015 Hopefully the machinist would have stamped how much material was removed if it was shaved. Quote Link to comment Share on other sites More sharing options...
SRRTz Posted February 12, 2015 Share Posted February 12, 2015 Stock thickness is 107.9mm or 4.24803 inches Quote Link to comment Share on other sites More sharing options...
Samurai7one Posted February 13, 2015 Author Share Posted February 13, 2015 thank you! Quote Link to comment Share on other sites More sharing options...
Project1 Posted February 15, 2015 Share Posted February 15, 2015 (edited) I think if the did the 0.08 shave this usually leads to shims for the cam, maybe even the springs. If you see shims they are probably there for that reason. But since you measured .. Solves that problem Edited February 15, 2015 by Project1 Quote Link to comment Share on other sites More sharing options...
Kash Posted February 16, 2015 Share Posted February 16, 2015 (edited) You should a have little over 1.5 mm below that P90 stamp on the right front of the head, at the bottom. My head is shaved .080 (2 mm) and it just cuts into the bottom of the numbers. Edited February 16, 2015 by Kash Quote Link to comment Share on other sites More sharing options...
Tony D Posted February 16, 2015 Share Posted February 16, 2015 ^^^^ That is a quick practical check for anybody thinking about a head in the junkyard. Basically like a 'Lincoln Head Penny Check' on tire tread, if you can't fit two credit cards on top of the head gasket and the bottom of the numbers on the head, it's been worked to some extent. A Credit Card is generally 0.040" (1mm) thick. Quote Link to comment Share on other sites More sharing options...
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