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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments          Search Questions:    gtomo      How can I find out if I have a matching number car the engine. Have a 66 gto, don't know how to find out if the numbers match (eng to car) Thanks in advance to anyone who can help me. posted: October 6, 2010       Answers (1)   retiredpartsman      GM DID PUT ENGINE CODE # ON RIGHT SIDE OF BLOCK BELOW CYL HEAD EXAMPLE WW IS FOR389-335HP 10.75 COMP RATIO 4 BB CARB MAN TRANS THERE SHOULD BE A SEQUENCE# ABOVE,CODE .IF YOU CAN FIND A BUILD SHEET UNDER FFONT SEAT IN SPRINGS OR BACKSEAT IT WOULD TELL WHICH ENGINE MODEL IT LEFT FACTORY WITH.ALSO BUILD SHEETS MIGHT BE UNDER FLOOR MAT.IF YOUCAN FIND CODE ON ENGINE CAN BRAKE DOWN FOR YOU,LIKE I DID THE WW CODE REFERENCEHOLLANDER INTERCHANGE MANUAL 34TH EDITION posted:  October 7, 2010

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