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#1 |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Confusion on which plugs/wires/filter - 72 Sierra Grande 350
I used the search function for info, and really only came up with more confusion
![]() The 72 GMC Sierra Grande that I just bought has a 350; presuming it hasn't been replaced with something else, the SPID code is 1LS910. This seems to be the only car I've ever had where I couldn't just look up the year and model and get an answer for plug type. What are the basic plugs I should use? Same with wires, distributor cap and oil filter? From the pic, is there anything non-standard about the engine? I keep reading about 'Vortec' heads and other things, and have no idea what options there were or what to look for. ![]() |
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#2 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,739
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Take plug out. Read number and manufacturer of plug. Cross reference #. Looks like a later model crate motor with passenger side dipstick. Has 12si alternator conversion as well in addition to the long water pump and flipped alternator installation.
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#3 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,739
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Flip the air cleaner lid so it's less likely to collect water. Take pic again with air cleaner removed so we can see if it has had an HEI converions. I would try and get the wires run from below again like the OEM installaiont on the 67-72.
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#4 | |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Quote:
If I Googled correctly, it looks like the 12si is a later model alternator and puts out a little more? |
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#5 | |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Quote:
I can't take a pic at the moment, but I believe it is HEI (the larger style cap, right?) Which wires, the plug wires? How were they run 'from below'? Sure wish I had another truck, stock, sitting here so I could compare! ![]() |
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#6 |
Registered User
Join Date: Apr 2015
Location: Ayr Ontario
Posts: 1,122
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
I have HEI, under wires, and r45tsx ac delco plugs at .045 gap. this will work on most sbc.
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#7 |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
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#8 |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Depending on what kind of heads you have you will need either a gasketed or tapered seat plug.
__________________
Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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#9 |
Registered User
Join Date: Apr 2015
Location: Ayr Ontario
Posts: 1,122
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
these plates are factory and the clips are a standard wire holding kit for the auto store
Last edited by Metaldoc; 07-17-2015 at 01:54 PM. |
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#10 |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Thanks!
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#11 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,854
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Here's another picture to study. The original routing for the front wires on each side was through a retainer clip on the oil pan then between the motor mount and block retained by the clip at the bottom of the head. The only things missing in my picture are the heat shields for the plugs. If you have an HEI, you'll need different plug wires than stock. The wires that I used (and learned about on this forum) were for late 70s (I think 75-82) Corvettes.
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#12 | |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Quote:
It is complicated, trying to find the right parts and right methods of routing things on this truck, as the PO changed a lot and I have no details about what was done - and because I've never actually seen the engine compartment of a stock or 'correct' GMC/Chevy pickup in person. |
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#13 |
Registered User
Join Date: Dec 2009
Location: bisbee, arizona
Posts: 1,530
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
for Gm trucks there is a heavy duty oil filter, Fram part number is PH 373. its a spin on 2 quart oi filter. I always use them ...when they fit. because they filter 100% of the oil even when cold and add an extra quart of capacity.
they screw on all right but on some trucks the exhuaste system does not have the clearance to remove and replace them. It gets old pulling your "Y" pipe to change the oil. |
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#14 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,161
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
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#15 |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
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#16 | |
Registered User
Join Date: Jul 2015
Location: Dallas, TX
Posts: 167
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Re: Confusion on which plugs/wires/filter - 72 Sierra Grande 350
Quote:
I'm kind of shocked, but really glad, to see how many people here have multiple older Chevy / GMC trucks. My other car is a 2000 Jeep Cherokee XJ 4x4, and that community is a lot like that. I was actually planning to get another XJ when I came upon this '72 GMC Sierra Grande long bed, and got it instead. I'd still like one more of each ![]() |
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