Zilla's 2007 winter work: - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 11-09-2007, 08:02 PM   #21
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Bill, I have seen them a little cleaner... And would like it to be a little cleaner.. But its not bad overall..

What I loved seeing was the Cylinder Bore.... It looks like a Mirror and I can still clearly make out the cross hatching in the bore... Looks to be 0 wear at the top of the bore as well.. Looking like a Good unabused find

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Old 11-09-2007, 09:45 PM   #22
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Yup. Got a little more lifter valley caramel and gunk buildup than I'd like, but the bottom end is pure perfection, and you're the first person besides me to point out the factory crosshatched honing in the cylinder bores.

All 6 bores are near-perfect.
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Old 11-10-2007, 11:21 AM   #23
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I actually had a pretty good idea of the condition of the cylinder walls before I tore off the heads. I used the borescope through the spark plug holes first, then tore off the oil pan for inspection. I could already see the crosshatching through the borescope before disassembly. If anything had looked 'wrong' or overly worn, I wouldn't have torn it down, and simply returned it for a better motor.

Here'* the #2, 4, and 6 cylinder bores:

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And a little problem I encountered while removing the timing chain cover. This will be repaired this weekend:
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(can you see the problem?)
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Old 11-10-2007, 11:24 AM   #24
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is that a broken bolt i see
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Old 11-10-2007, 11:25 AM   #25
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yup broken bolt time for the drill and the easy out whit the engine out is not that bad
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Old 11-10-2007, 11:29 AM   #26
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It'll be a piece of cake in this condition.

I have enough sticking out to grind it flat first, then center punch it well.
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Old 11-10-2007, 09:31 PM   #27
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Odd. .I thought I had posted about the cross hatching in my 186K block. It looked similar to your new motor, these motors don't seem to wear rings or cylinder bores.
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Old 11-10-2007, 09:43 PM   #28
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It depends.. So Far just about every series Ii I have seen will have next to nothing for bore wear even at 200k...

The series I'* are about the same way... There is usually nothing for Bore wear.. and I think the later years got better as lower friction technology was improving..

I have a 175k 3800 seies I block here that does have a little bore wear... But I don't that motor was loved like it should have been..

when I get around to rebuilding my Series II, i'll bet it will be good with a Hone..

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Old 11-10-2007, 09:45 PM   #29
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Bore wear is one thing (and I was expecting these to be near-virginity).

Compression is another thing. When I heard this motor was 175psi, with all cylinders within 5psi of each other, I shelled out the bucks.
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Old 11-10-2007, 09:55 PM   #30
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Have you considered forged pistons.
Just for that added measure of security.
Ya, I know they cost a bunch but....
What about the rod and crank bearings? Are you going to plasti-gage them to check tolerances?

Cylinder pressure is one thing.......oil pressure is another.
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