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#1 |
Registered User
Join Date: Oct 2017
Location: Kamloops BC, Canada
Posts: 20
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I recently inherited a 1972 GMC Sierra Grande from my grandpa. I’m trying to get started on the truck, but I can’t figure out what size the engine is. I know that it’s a V8, but they released 3 models that year: the legendary 350, the 307, and 402. The truck is the 4x2 3/4 ton.
I am new to this kind of stuff and I’m just learning so take it easy on me please! Thanks for any help! |
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#2 |
Registered User
Join Date: Jan 2016
Location: Barber City, CA
Posts: 4,777
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Re: What size engine is in my truck?
howdy, welcome aboard!
spid decal in the glove box if in tact should list it.. easy way to tell sbc from bbc is the rocker covers, good luck! sbc [283, 305, 307, 327, 350, 400] ![]() bbc [396, 402, 427, 454] ![]() |
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#3 |
Registered User
Join Date: Mar 2013
Location: Campbellsville, KY
Posts: 888
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Re: What size engine is in my truck?
Options sheet in the glove box, possibly an emissions sticker on the air cleaner? stating engine displacement (assuming it's original to the truck), or the stamped codes on the block at the front of the passenger-side head can be decoded.
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Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
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#4 |
Registered User
![]() Join Date: Feb 2012
Location: Vinton, Va.
Posts: 473
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Re: What size engine is in my truck?
If you list the #'s on the front of the block by water pump and #'s on back of block by distributor, I can tell you exactly what you have. You could also find the info online if you have those #'s handy.
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#5 |
Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,075
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Re: What size engine is in my truck?
Well I'm hoping it's either the 350 or the BB.
-klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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#6 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: What size engine is in my truck?
I don't think 3/4 tons came with a 307.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#7 |
Registered User
Join Date: Oct 2017
Location: Kamloops BC, Canada
Posts: 20
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It is the 350! I did find it on the options sheet. Thanks for all your help. Wow this is such a big community on here. I will definitely be asking lots of questions.
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#8 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Re: What size engine is in my truck?
Nice options.
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#9 |
Registered User
Join Date: Feb 2015
Location: Alberta, Canada
Posts: 148
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Re: What size engine is in my truck?
Looks like your Grandpa wasn't shy on the options. Unless you know for sure, there is always the possibility that the engine is not the factory engine that came with the truck.
In this case, the easiest way to id the block is to locate the engine VIN pad (front passenger side of the block) located at the top of the deck where the cylinder head spends it time. I'm sure there are several good sites that provide info on these numbers/letters, but the one I have found most abundant with info is: http://www.nastyz28.com/chevy-engine-code-stampings.php The numbers on the block ID pad will help you identify where the engine was installed in the vehicle, what type of vehicle it is (C20 pickup) and there will be a series of 2 or 3 digit letters known as the suffix code. Those are the letters you'll be looking up in the above link. Hopefully this helps. The info I have found has been pretty accurate with the exception of my '67 283 block that is original to my truck. Running the casting number it comes up as a '67 283 with some notes saying that it was replaced with the 307 in '68. But when I look up the suffix code, the resources identify it as a 307. Deciding factor was the good old fashion visual check which was the PCV valve at the back of the lifter gallery, and the tall oil filler tube at the front of the intake manifold (pretty sure 307's didn't have these). Anyways, check out that website for further confirmation on your engine block's history. And good luck on your truck.
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'67 c10 cst farm truck |
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#10 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: What size engine is in my truck?
First time I’ve seen “willow green” actually types on a SPID. Welcome, very nice truck you have there, enjoy and ask all the questions you want!
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#11 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,115
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Re: What size engine is in my truck?
Welcome to the site from a fellow Canuck. This is a great place and you will get all the respectful help and advice ( and sometimes too much advice ) you need for your truck. You have a family heirloom and that is special. One thing about this site is we LOVE pictures so please when you get a chance post up some pictures of the truck.
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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Tags |
grande, grandpas truck, new guy, restoration |
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