What would you do? - Chevelle Tech
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post #1 of 24 (permalink) Old May 26th, 20, 8:16 PM Thread Starter
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What would you do?

I have these aluminum heads that have a little damage to one chamber. I found a piece of aluminum on top of the piston. Don't know where it came from, so the engine is apart now, Should I be concerned? I can get the heads milled, but don't think it will be enough to eliminate the problem. The spots are near the outside.... have small corresponding marks in piston. Pictures show debris and damage
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post #2 of 24 (permalink) Old May 27th, 20, 12:52 AM
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Re: What would you do?

Smooth it up a little with a dremel or die grinder and either a stone bit or cartridge sanding roll just to get the sharp edges off the dents, don't worry about getting the entire dent removed.
It will be fine in use. Performance won't be any different.

Check the aluminum casting around the area the valve guide os pressed into the port, that may be where your mystery piece came from if it isn't off a ring land. Piston looks like it has seen detonation pretty heavily.
What's the compression ratio?
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post #3 of 24 (permalink) Old May 27th, 20, 6:58 AM
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Re: What would you do?

Those marks wont hurt a thing. They are not where the gasket seals. I would just smooth them out a little with some emory cloth or sandpaper and keep on going.

My biggest concern would be finding out what made the marks.
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post #4 of 24 (permalink) Old May 27th, 20, 9:30 AM
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Re: What would you do?

The pic of the piston looks like some ring land is missing or is it a shadow?
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post #5 of 24 (permalink) Old May 27th, 20, 10:16 AM
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Re: What would you do?

Are you pulling the piston out ? I would want to check that whatever hit it didn't pinch the top ring groove down and keep the ring from moving freely.

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post #6 of 24 (permalink) Old May 27th, 20, 11:27 AM Thread Starter
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Re: What would you do?

I have pulled the pistons, ring lands look fine. The debris is the small piece on top of the piston in the picture. Small as a single kernel of corn.....The motor is a pump gas 496 with srp pistons. I don't have any idea what the piece of aluminum came from. Heads look intact around guide boss and around rocker helicoil as well. I'm guessing someone dropped something in the intake but buddy don't know history of the motor... I do think it was a sloppy build though
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post #7 of 24 (permalink) Old May 27th, 20, 12:05 PM
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Re: What would you do?

Quote:
Originally Posted by Kirk View Post
I have pulled the pistons, ring lands look fine. The debris is the small piece on top of the piston in the picture. Small as a single kernel of corn.....The motor is a pump gas 496 with srp pistons. I don't have any idea what the piece of aluminum came from. Heads look intact around guide boss and around rocker helicoil as well. I'm guessing someone dropped something in the intake but buddy don't know history of the motor... I do think it was a sloppy build though
Your explanation is likely. At this point (based on a sloppy built), I'd want to take some things apart and do some re-installation.

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post #8 of 24 (permalink) Old May 27th, 20, 2:05 PM
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Re: What would you do?

or at least splurge on some Plastiguage and see what the rods and mains are at. Every one. To start. Gives visual of all bearings and their clearances. At the least both #1s. And check a few skirt and rod side #s .

And the head is fine as said. A little dressing down, not much.
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post #9 of 24 (permalink) Old May 27th, 20, 8:34 PM
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Re: What would you do?

Friend just bought an engine. Pistons were so loose it required a rebuild. Check and check again.


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post #10 of 24 (permalink) Old May 27th, 20, 10:33 PM Thread Starter
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Re: What would you do?

I am going to drop off the block and crankshaft, have them cleaned....also main bearings look bad(shiny) and it has main studs, my bet is they did not check it out before and at least line hone it. A few skirts had light scuffing. Have the shop give a quote for my buddy, who wants to go LS😱
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post #11 of 24 (permalink) Old May 27th, 20, 10:34 PM Thread Starter
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Re: What would you do?

Rods didn't look bad thankfully
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post #12 of 24 (permalink) Old May 27th, 20, 10:37 PM Thread Starter
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Re: What would you do?

Quote:
Originally Posted by 1967 chevelle malibu View Post
The pic of the piston looks like some ring land is missing or is it a shadow?
That's just a shadow
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post #13 of 24 (permalink) Old May 28th, 20, 1:42 AM
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Re: What would you do?

Based on the picture of the one bearing, there appears to have a lot of "scuffing" on that bearing.

> But it is just one picture that I see on my cell phone.

> Looks like there was a lot detonation.

> Best to do take it to an engine shop you trust and have it checked out.

Good Luck, keep us posted!




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post #14 of 24 (permalink) Old May 28th, 20, 1:53 AM
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Re: What would you do?

Obviously - find out why it was detonating so badly. Check the timing CURVE when you get it back together.

I'll restate the obvious here...

> Today's days pump gas doesn't allow much static compression.



CJM
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post #15 of 24 (permalink) Old May 28th, 20, 5:43 PM Thread Starter
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Re: What would you do?

So here's a little update, dropped block and rotating assembly off to machine shop, he said block was never line honed, as he was looking at main caps, and he said crank was internally balanced......I said well you better check it out because it had external balancer on it. Never been decked before either. This motor had head studs in it, with one helicoil in deck surface, and that repair was sitting above deck surface!
It will be right now hopefully
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