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japar Jan 24th, 10, 4:54 PM I got a set of pistons and rods that I was told were ZL1 or L88. In my book they don't match. It says the piston # is GM 3959105. The pistons I have are GM 3947886 which I can't find any listing for. Does anyone know what appilcation these are for. Molly's 70 Jan 24th, 10, 5:09 PM ZL1 & L88 pistons were of floating pin design. do they have a groove to hold a retainer? LS7 Jan 24th, 10, 5:13 PM One is the part number, and the other is the identification (casting) number, see link below. http://books.google.ca/books?id=1kXAwwcLpPQC&pg=PA152&lpg=PA152&dq=3947886+piston&source=bl&ots=MBB1pgB-Di&sig=WlKWFwWPnzjY0a2m2n1a4zbfZdU&hl=en&ei=KMVcS5XZLMeUtge_u72nAg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CAoQ6AEwAQ#v=onepage&q=3947886%20piston&f=false japar Jan 24th, 10, 6:34 PM Standard bore 4.250 , hi dome full floaters but does not the normal snap ring. The ring that holes the pin in does not have the 2 small holes . Found the TRW # on the inside looks like 2399 which looks like a 454 ,9.09-1/118 but these pistons have like a .585" dome. Like a 12-1 comp. | ||