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BobS · 06-21-2010, 03:41 PM

daves71k5,

Engine size is stamped on the top of the block just forward of the passenger side head followed by the serial number. It should say either 305E or 351E.

Bob

06-21-2010, 03:41 PM	#8
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 569	Re: 1968 gmc v6 daves71k5, Engine size is stamped on the top of the block just forward of the passenger side head followed by the serial number. It should say either 305E or 351E. Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel