Rotarydave Posted December 13, 2009 Share Posted December 13, 2009 I'm in the middle of refreshing a '93 Loyale 4wd wagon's engine I recently aquired and noticed that all the pistons have a marking on the top that looks like this: <B> . Does this indicate an oversized piston? Or is it a weight marking? I've been on here researching quite a bit for this rebuild (due to a spun bearing and sludged engine!) This place is a wealth of info and helpful troubleshooting. Thanks, David Link to comment Share on other sites More sharing options...
Rotarydave Posted December 14, 2009 Author Share Posted December 14, 2009 Bump Link to comment Share on other sites More sharing options...
MilesFox Posted December 14, 2009 Share Posted December 14, 2009 i believe its for orienting the piston to the block when you are installing the bottom end. Link to comment Share on other sites More sharing options...
ShawnW Posted December 14, 2009 Share Posted December 14, 2009 All of Subaru's pistons have A or B sizing within each size. You can order a Standard size unbored piston in an A or B size which is very minimal difference. The block should have markings on it to indicate what the bores need. Link to comment Share on other sites More sharing options...
Rotarydave Posted December 15, 2009 Author Share Posted December 15, 2009 Thanks for the replies. I ended up finding a picture of a short block with cleaned pistons that had that "B" marking on them. Link to comment Share on other sites More sharing options...
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