The 3B pistons are = #56 drill and the 3A's are too small for the #54 drill and too big for the #55, so i would conclude that the 3A's are = #554 losi style. as far as the 2 hole pistons go i think they are exactly the same as the AE ones, ie, 2C = No2 and 2B = No1. I have drilled out some 3B's to #55 so i now have a nice range. At the mo' i am running 3B and 35wt in the front and 3A's in the rear with 30wt. I am trying to work out if i should go to 35wt in the rear too or switch to my drilled #55's as the back seems a little soft. I hope this helps peeps and i hope you'll all chip in as my car is good and begs to be pushed but can get a little out of shape at speed, mine was the black RB5 at coventrys 3/4/5's, in the B final.
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