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Old 01-13-2006, 02:42 PM
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Pitted Cylinder Wall

The SB in an '80 vette we bought was running poor and not idling well. After rebuilding the Q-Jet with no improvement, I pulled the heads off to see if it needed a valve job. I found the combustion chambers aren't carboned badly but the number one cylinder wall has a couple of pits in it as if water had been standing and rusted. I went ahead and pulled the motor out and am figuring to bore it and build it back.

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Old 01-13-2006, 02:49 PM
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So what was your question. If you want to know if this is the right thing to do then yes. However if one did not want to bore it and the pitting was not bad honing could get rid of it... Bore is reccomended.

Sound like overall you have a poorly maintained motor, or maybe it was just sitting for a long time. Either way check everything over on it twice before reassembly
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Old 01-13-2006, 03:06 PM
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yeah, you're right, there wasn't really a question. I was just thinking out loud about what I've got going on out in the shop. I suspect the motor was a junkyard donation by a previous owner.
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Old 01-13-2006, 04:54 PM
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You said a couple of pits in ONE cylinder.....

That is NOT making the engine run poorly. You have some other serious problem....

I have seen some pretty bad rust "rings" in cylinders from rusted rings that went undetected until the engine was pulled to be bored.

I would look toward stuck distributor advance weights, jumped timing chain, etc.
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Old 01-13-2006, 06:38 PM
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I agree. I've had small blocks with pits in all the cylinders that ran good and didn't use oil. You have another problem.
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Old 01-14-2006, 07:32 AM
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OK, All that makes sense. The rebuild will include a new cam and timing chain. I'll go through the distributor with new bushings, weights and springs. Someone put a set of "low end" roller rockers on the heads in the past. I'll minimize the vacuum "cicuitry" initially. I expect I ought to be able to get a good reliable driver out of it.
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Old 01-14-2006, 09:15 AM
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Also check the vacuum advance, it maybe ruptured from dry rotting. If it`s the original unit I would replace it regardless, it`s 26 years old now. Make sure it`s connected to a manifold vacuum source upon reinstallation.
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Old 01-14-2006, 12:19 PM
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you haven't said if you are willing or want to spend a bunch of money on a complete rebuild or if you would rather have the pits honed the out if at all possible.make that decision and figure out involved you want to get and then go on with the planning.if it were me i'd hook the vaccum can to a vaccum source above the plate in the carb unless you want full adv. all the time.
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