Engine ID Help Please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dmc1 · 05-20-2009, 04:53 AM

Who can tell me what this engine is? Here are the numbers off of the pad on the front of the engine. TO528 CMJ and 16R510581. Is it a 350 or a 305?

I understand the T= Tonawanda, 0528 is May 28th. Does the "6" in the VIN stand for 1976? What does the "R" stand for? I know the rest of the numbers are sequence numbers for production.

Thanks for any help. DMC1

JimKshortstep4x4 · 05-20-2009, 07:09 AM

CMJ suffix code is used on two different years. Either a 1974 350 CID or a 1980 305 CID. I realize that this does not make sence, since the VIN number has a 6 in it indicating a 1976.

The R is in the position where the engine plant is identified and there are no engine plants with an "R" designation.

There may be an error in the stamping.

Look at the front balancer and if it is a small one then the engine is probably a 305. You can also check the cast date on the back of the engine for confirmation.

Jim

dmc1 · 05-20-2009, 06:21 PM

Jim, thanks for the reply. I feel confidant it is a 350 now that I have looked at the balancer and also checked the numbers on the back of the block. Thanks again,
DMC1

JimKshortstep4x4 · 05-20-2009, 07:39 PM

Good deal!

Jim

05-20-2009, 04:53 AM	#1
dmc1 "I'm Walking Deadman's Drive!" Join Date: Jul 2008 Location: Rock Hill SC Posts: 34	Engine ID Help Please Who can tell me what this engine is? Here are the numbers off of the pad on the front of the engine. TO528 CMJ and 16R510581. Is it a 350 or a 305? I understand the T= Tonawanda, 0528 is May 28th. Does the "6" in the VIN stand for 1976? What does the "R" stand for? I know the rest of the numbers are sequence numbers for production. Thanks for any help. DMC1

05-20-2009, 07:09 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Engine ID Help Please CMJ suffix code is used on two different years. Either a 1974 350 CID or a 1980 305 CID. I realize that this does not make sence, since the VIN number has a 6 in it indicating a 1976. The R is in the position where the engine plant is identified and there are no engine plants with an "R" designation. There may be an error in the stamping. Look at the front balancer and if it is a small one then the engine is probably a 305. You can also check the cast date on the back of the engine for confirmation. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

05-20-2009, 06:21 PM	#3
dmc1 "I'm Walking Deadman's Drive!" Join Date: Jul 2008 Location: Rock Hill SC Posts: 34	Re: Engine ID Help Please Jim, thanks for the reply. I feel confidant it is a 350 now that I have looked at the balancer and also checked the numbers on the back of the block. Thanks again, DMC1

05-20-2009, 07:39 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Engine ID Help Please Good deal! Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC



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