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86 Posts
Had to build a short block in a hurry, only pistons available in short order were probe. Haven't heard anything bad about these so we tried them. Nothing special just .030 over for a-429 heads. No valve to piston clearance -no big deal just cut more- this was expected. Valve pocket was at wrong angle about 3 deg wrong and they varied a bit in location. Went to put the rings on and wrong ring support rails. Called them up and had them send the correct one's ups red, arrived a day late ups blue. Wrong support rails again. called them up and they said to just cut them with a pair of ***** and they still didn't fit tight on the piston i.d. tight just flopped around. Talked with kb and they sent me some that would work overnight at no charge. Not impressed with their service or there product. Also used a scat forged crank, mains on the large size had to use .001 over bearings, the same with the rods .001 over bearings and the journals varied .0004