Can someone tell me if these heads are good or not please. - JeepForum.com
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post #1 of 14 Old 10-25-2021, 06:18 PM Thread Starter
xcaliber81
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Can someone tell me if these heads are good or not please.

These are my H.O heads #1 #2 #4 have these scratches and I may have a use for them. I have an 02 laredo with a dropped valve seat that I may fix depending on the bottom end or if I can't use the original heads.

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post #2 of 14 Old 10-25-2021, 08:09 PM
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the pic kinda doesn't help are you indicating the scoring on the bearing mounting surface? if so, get it line honed, and run oversized bearings. the bearings are gonna cover those marks, which might indicate something seized, and spun those bearings, or maybe some savage tried to polish the surface with 8 grit sandpaper.

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post #3 of 14 Old 10-25-2021, 08:40 PM Thread Starter
xcaliber81
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These are the heads AFAIK they didn't use bearings?

My bad I should have said camshaft mains #1 #2 and #4.
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post #4 of 14 Old 10-25-2021, 11:00 PM
x4rattler
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whoa, looks like the oil pump in that engine was pumping sand
instead of oil. I would say that the engine is trash also.
and it looks like someone pressure washed a lot of crud
out of those heads.
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post #5 of 14 Old 11-01-2021, 02:24 PM
leadsled jeep
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I’d take them to a machine shop and see what they say. Like Golden Arm I think it’s just a matter of machining. It’s a hunk of aluminum and all seals, valves, bearings can be replaced. Even aluminum cracks can be welded and repaired. I don’t see any thing that couldn’t/ shouldn’t be fixed.

But…. They will know for sure.
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post #6 of 14 Old 11-01-2021, 03:00 PM
Mr. Bitey
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Quote:
Originally Posted by leadsled jeep View Post
I’d take them to a machine shop and see what they say.
Yup. That. Machine shops are where real live alchemy happens. They spin straw in to gold. Well, kinda..... and for a price.... But yes, most heads and blocks can be repaired.

Your cam journals look like they spun bearings. A shop would likely line hone them, so you can plunk oversized bearings in them. Or, they can set them up for you with new bearings, seats, guides, 3 angle valve job, and lash set - ready to toss right under the hood. They'd even drill out our notoriously small oil return holes too if you ask.

Point being, you're heads ARE good. After you give a machine shop $$$$. Actually not a bad thing if you have the $$$$ to throw at it. A shop that knows the Power Tech engine will put better seats in and stake them, better guides/seals, and drill out the return holes without even asking. They'll be better than they were from the factory

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post #7 of 14 Old 11-02-2021, 02:28 PM
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Now you’ve got ME looking forward to getting these upgrades done.
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post #8 of 14 Old 11-09-2021, 05:18 PM
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Thing is the cam journals are parent material bearings, they have no bearing inserts. And I know of no one who makes them for oversized journals and caps. The cams from these heads ended up in a friends 4.7 Dakota, they were a bit rough but buffed out nice, he beats the snot out of it and all is well. And yes I thoroughly cleaned them inside..

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post #9 of 14 Old 11-10-2021, 10:16 AM
Mr. Bitey
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Thing is the cam journals are parent material bearings, they have no bearing inserts. And I know of no one who makes them for oversized journals and caps.
Not great news, but good to know none the less for my own future reference. I have an HO sitting on a stand I may rebuild one day. I'll have to look at the cam journals now.... Thanks for chiming in...
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1970 'Cuda, 340 4bbl (10.952et @ 123mph)
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1974 AMC Gremlin X, 440 6bbl (sold)
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post #10 of 14 Old 11-10-2021, 12:22 PM
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Quote:
Originally Posted by Mr. Bitey View Post
Not great news, but good to know none the less for my own future reference. I have an HO sitting on a stand I may rebuild one day. I'll have to look at the cam journals now.... Thanks for chiming in...
It's an issue I dealt with years ago working on older Japanese motorcycles, it is pretty much standard practice on the heads. I have seen guys attempt to build up with weld and machine back to spec but I don't know the success rate.

2004 Limited, 4.7 modded slightly, IRO 3" RockLink LA front, adjustable SA rear, Bilsteins, Addco bar, JKS disconnects. Coming attractions include 242hd, IRO SYE and Woods DS right after the new engine/trans..
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post #11 of 14 Old 11-10-2021, 12:45 PM
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Quote:
Originally Posted by cDee63 View Post
It's an issue I dealt with years ago working on older Japanese motorcycles, it is pretty much standard practice on the heads. I have seen guys attempt to build up with weld and machine back to spec but I don't know the success rate.
Now that I think of it, I noted this not too long ago on a VTEC in a CR-V, when I replaced the cam phaser. I studied the cam journals, because I could not figure out the material - it sure looked like aluminum, but there was no bearing/bushing. That did not compute in my old brain. But then again, I am certainly no metallurgy expert. I wonder if items like this contribute to so many manufacturers requiring synthetics today....

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1970 'Cuda, 340 4bbl (10.952et @ 123mph)
1972 Dart Swinger, Gen III 6.4l Hemi (11.223 @ 113mph)
1974 AMC Gremlin X, 440 6bbl (sold)
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post #12 of 14 Old 11-10-2021, 01:11 PM Thread Starter
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The reason those heads and cams look so ****ty was because the timing chain guides broke. Stupid me I ignored the low oil pressure at idle on random times thinking yeah its just the opsu lol. I too beat the snot out of that engine and the whole time it had low pressure. If the heads are bad oh well maybe I can save the bottom end? I guess the H.0 crank is forged I'll see. It's sitting on an engine stand in my shed waiting patently.

I take better care of the replacement H.O in my overland now since it sucked to replace and a tad hard to find it seems.
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post #13 of 14 Old 11-10-2021, 01:39 PM
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Stupid me I ignored the low oil pressure at idle on random times thinking yeah its just the opsu lol. I too beat the snot out of that engine
I would have done the exact same thing lol. I'd still have a shop look at them. Just because they are gouged doesn't mean they can't be saved. Maybe they can overbore and stake a split sleeve in there....

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1970 'Cuda, 340 4bbl (10.952et @ 123mph)
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post #14 of 14 Old 11-13-2021, 12:31 PM
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i saved mine and they looked worst than yours. i used 400 emery paper not the cloth type lightly smooth out then 600 then 800 to bring a very nice surface. Im using them now in my jeep WJ..as long as your careful and check out any up and down movement of the cam in place you will be fine. its not like it has to be perfect surface just cleanup using your finger with emery paper to bring out a smooth surface you do fine. i also did similar to the cams lobes took weeks to do the cams using only 800 on them. runs perfect now but i did do a whole rebuild on the timing chains, guides, valves, roller rockers, lash adjusters, oil seals, oil pump, gaskets, water pump. i did all the work except removing and putting the engine back in.
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