How to tell which motor I have - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68_Step · 02-15-2003, 08:07 AM

My truck is new to me, and the guy I bought it from told me it had a 350 in it. I did not really care which motor it had in it at the time, I just concerned myself with how it ran (great). Which set of numbers on the motor will tell me what I have? The one on the passenger side front of the motor (stamped in I think)? Or the one from the back of the motor passenger side? Will I be able to see the one on the back without pulling the motor? All I am sure of at the moment is that it is a V8 with a 2 barrel Rochester.

Thanks!

justin · 02-15-2003, 08:20 AM

If it has a small harmonic balencer than it is probably a 327, other than that I have no clue.
If it is the original moter it is not a 350, unless I am mistaken they didn't come out with the 350 untill after '68.

68_Step · 02-15-2003, 08:28 AM

Justin, I think you are correct, that the 350 was not stock in the trucks until 69(?). Wasn't there 307 that year?

*Randy70C-10* · 02-15-2003, 09:56 AM

There is a large 7-digit number embossed on the back, drivers side of the motor (at the top). Get that number, and go to: www.mortec.com

BLACK AND BLUE 67-72 · 02-15-2003, 11:44 AM

The number on the passenger side front will usually tell you what the motor is. Just Post the number on the board and someone can tell you what you have. Just because it's in a truck that wasn't available with a 350, Doesn't mean that it's not a 350! I have a 1967' GMC with a 350, that it had in it when I bought it. It should have both Numbers and Letters stamped on the front passenger side. I hope this helps.

68_Step · 02-15-2003, 10:19 PM

Thanks! Helped my son replace shocks his '78 today, I will look for the numbers tomorrow morning.

02-15-2003, 08:07 AM	#1
68_Step Registered User Join Date: Feb 2003 Location: Marshfield, MO Posts: 355	How to tell which motor I have My truck is new to me, and the guy I bought it from told me it had a 350 in it. I did not really care which motor it had in it at the time, I just concerned myself with how it ran (great). Which set of numbers on the motor will tell me what I have? The one on the passenger side front of the motor (stamped in I think)? Or the one from the back of the motor passenger side? Will I be able to see the one on the back without pulling the motor? All I am sure of at the moment is that it is a V8 with a 2 barrel Rochester. Thanks!

02-15-2003, 08:20 AM	#2
justin PROJECT LO-LYF Join Date: Jul 2002 Location: MO. Posts: 285	If it has a small harmonic balencer than it is probably a 327, other than that I have no clue. If it is the original moter it is not a 350, unless I am mistaken they didn't come out with the 350 untill after '68. __________________ FOUNDING MEMBER OF THE "O-SH*T, THAT TRUCK IS LOW" CLUB PROJECT: LO-LYF Bagged 68 Shorty home.att.net/~justin.lewis

02-15-2003, 11:44 AM	#5
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	The number on the passenger side front will usually tell you what the motor is. Just Post the number on the board and someone can tell you what you have. Just because it's in a truck that wasn't available with a 350, Doesn't mean that it's not a 350! I have a 1967' GMC with a 350, that it had in it when I bought it. It should have both Numbers and Letters stamped on the front passenger side. I hope this helps. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

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02-15-2003, 08:28 AM	#3
68_Step Registered User Join Date: Feb 2003 Location: Marshfield, MO Posts: 355	Justin, I think you are correct, that the 350 was not stock in the trucks until 69(?). Wasn't there 307 that year?

02-15-2003, 09:56 AM	#4
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	There is a large 7-digit number embossed on the back, drivers side of the motor (at the top). Get that number, and go to: www.mortec.com

02-15-2003, 10:19 PM	#6
68_Step Registered User Join Date: Feb 2003 Location: Marshfield, MO Posts: 355	Thanks! Helped my son replace shocks his '78 today, I will look for the numbers tomorrow morning.



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