72 Suburban cylinder head question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AlmostClueless · 11-10-2018, 01:45 PM

Hi, everyone,

Just bought a very original, but really, really rough (sat outside untouched since 1988) 72 K10 Suburban & I'm just hoping to work over the next couple of years to get her into a decent beater to use on the farm & for fishing/camping/hunting. So, hoping to spend as little as possible. The engine's stuck. I got one head off so far & hoping to get the other off today if weather holds. Cylinders on the side I removed look really good, no real ring groove, surface rust...just appear to need some penetrating oil, some plumber's cloth maybe, then push the pistons out, hone the bores & go with new rings and bearings. Anyway, my question is with the heads:

They're 487X castings (casting date indicates actually cast in 71) and as long as they're not cracked, they look really good. Valves are all sitting way up high and even all across. Do any of you know whether they have induction hardened exhaust seats? Hoping that I can run them with just a decent valve job & not have to spend the extra cash for a hardened seat install.

Thanks for any information and take care.

Clueless

**HO455** · 11-10-2018, 03:39 PM

I don't have a clue about that casting number, but if it was running in the 80's it was on unleaded fuel. So if the seats look good then they are most likely a hardened seat of some kind. If they aren't hardened and look good then you may have a fresh valve job and are good for 30-40k miles at the least. If it was mine and the seats look good I would install some new positive seals on the valves and move forward.

AlmostClueless · 11-10-2018, 08:05 PM

Howdy, 455,

Good points, all. Thanks for the wisdom. The odometer shows 25,900, which means at least 125,900. It hadn't occurred to me that a good number of those would've been on unleaded gasoline given it was on the road till '88, but it surely makes sense. That makes me feel a ton better about my chances at keeping costs down. Thanks, again. I've only been on this forum for a short time, but I'm already learning a lot. Take care.

A little less clueless, HA!

**HO455** · 11-12-2018, 06:28 PM

How about posting some photos? We all love that stuff.

11-10-2018, 01:45 PM	#1
AlmostClueless Registered User Join Date: Oct 2018 Location: St. Louis, MO Posts: 7	72 Suburban cylinder head question Hi, everyone, Just bought a very original, but really, really rough (sat outside untouched since 1988) 72 K10 Suburban & I'm just hoping to work over the next couple of years to get her into a decent beater to use on the farm & for fishing/camping/hunting. So, hoping to spend as little as possible. The engine's stuck. I got one head off so far & hoping to get the other off today if weather holds. Cylinders on the side I removed look really good, no real ring groove, surface rust...just appear to need some penetrating oil, some plumber's cloth maybe, then push the pistons out, hone the bores & go with new rings and bearings. Anyway, my question is with the heads: They're 487X castings (casting date indicates actually cast in 71) and as long as they're not cracked, they look really good. Valves are all sitting way up high and even all across. Do any of you know whether they have induction hardened exhaust seats? Hoping that I can run them with just a decent valve job & not have to spend the extra cash for a hardened seat install. Thanks for any information and take care. Clueless

11-10-2018, 03:39 PM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: 72 Suburban cylinder head question I don't have a clue about that casting number, but if it was running in the 80's it was on unleaded fuel. So if the seats look good then they are most likely a hardened seat of some kind. If they aren't hardened and look good then you may have a fresh valve job and are good for 30-40k miles at the least. If it was mine and the seats look good I would install some new positive seals on the valves and move forward. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

11-10-2018, 08:05 PM	#3
AlmostClueless Registered User Join Date: Oct 2018 Location: St. Louis, MO Posts: 7	Re: 72 Suburban cylinder head question Howdy, 455, Good points, all. Thanks for the wisdom. The odometer shows 25,900, which means at least 125,900. It hadn't occurred to me that a good number of those would've been on unleaded gasoline given it was on the road till '88, but it surely makes sense. That makes me feel a ton better about my chances at keeping costs down. Thanks, again. I've only been on this forum for a short time, but I'm already learning a lot. Take care. A little less clueless, HA!

11-12-2018, 06:28 PM	#4
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: 72 Suburban cylinder head question How about posting some photos? We all love that stuff. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377



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