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08-21-2019, 03:58 AM | #1 |
Registered User
Join Date: Aug 2005
Location: las vegas nevada
Posts: 5
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Block codes. Grade my paper?
72 gmc 1500 Sierra. It has a rebuilt engine from another vehicle. I was told it was a 78 blazer but thats not what I get from the block codes.
I want to ID my engine. The goal is to be able to get engine specific parts by answering year make model with the actual engine info (original auto) and not the truck stats. Block stamped on flange under head front passenger side C5Z156659 V0618TYW Bell housing flange drivers side casting 3970010 My best guess is 350 4 bolt 6/18/1975 in a C10 chevy pickup I don't know what these mean... L Ls9, conv.cab, Anyone who cares to check my work or add to it, I appreciate the help. |
08-21-2019, 06:51 AM | #2 |
Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: Block codes. Grade my paper?
Yep, by the suffix code (the most specific#) it's a 1975 (truck) 350 4bbl 165hp C10-2500
Conventional cab means a normal pickup/cab & chassis cab. Not a G-series Van or P-series forward control chassis or COE in bigger trucks
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
08-29-2019, 05:40 AM | #3 |
Registered User
Join Date: Aug 2005
Location: las vegas nevada
Posts: 5
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Re: Block codes. Grade my paper?
I appreciate your confirmation Special K, and the explanation of the notes.
I wonder out loud (and will look up the answer)... "What on earth made them look to lower hp to 165? To capture the 4 cylinder market? I think they have 200hp coming from one of those now a days Best Regards C |
08-29-2019, 08:26 AM | #4 |
Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,518
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Re: Block codes. Grade my paper?
Manufacturers went to the net numbers from gross HP in '71 due to insurance companies going bugnuts over the high HP numbers. I asked that very question of my manager in late '70 when the HP numbers were reduced on the '71 models.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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