Ok, thank you for the information, makes seriously me rethink stuff. Not to debate or anything, just curious, why would the ringlands all of a sudden break if the engine is tuned correctly (ignition etc)? Do you mean that perhaps the structure of the material has weakened or something like that?

I bet I can find a good rod+piston (standard size) or two, and send them to you, if you can figure out the shipping procedure... Please verify the engine has not been overbored, and please send the date of the block.

Lou

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Home of Slant6-powered fun machines since 1988

I was just getting ready to make the same offer, I have the six OE pistons that came out of the 83 D150,
motor was never abused, about 100K on the motor when the pistons were removed. These are six standard bore pistons,
and five piston pins ( I'll look around the other pin is somewhere?).
That you can have for the price of shipping from USA Zip code 46220.
I can ship, US Postal, UPS or Fed Ex, No charge for boxing or anything but shipping.

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Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

Cool, Dadtruck. I bet he has a forged crank Slant (1960-1976).

Lou

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Home of Slant6-powered fun machines since 1988

yes,, I was not thinking about sending rods, any engine machine shop worth their salt should be able to press the pin out of the rod without damage to the rod-pin-piston.

and when it comes to assembling the rod-pin-piston, the same machine shop should have a process for heating the small end of the rod and it all slides back together.

shipping six rods will add a lot of shipping weight to the package,, but shipping one or two pistons and rods may still be workable. Then he needs to go with your offer as I do not

have any rods I am looking to get rid of I was offering only pistons and pins.

_________________
Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

I have many stock rods and pistons, already assembled and in decent shape. I just need to find 1-2 good ones and he can choose which one to use with no pressing/machining required.

If he just needs a piston and can get it pressed onto a rod, Summitracing or rockauto can send him one for cheap...

Lou

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Home of Slant6-powered fun machines since 1988

He's said the pistons are +.060".

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Official Cookie and Mater Tormentor.

and so it is,,,,,although slants can be bored larger than .060

if it was me, and I was doing a very low dollar repair I would:

1) check all six pistons to see how easily the rods swing, no hang ups would indicate that the pin bores are still round
2) remove what remains of the rings on all six pistons and the bearings from the rods, if plans include re using the bearings, mark them so they go back in the same rod, top and bottom
3) clean the pistons - rods as an assembly, use a solvent, some fine steel wool, follow up with plenty of hot water and detergent, dry thoroughly especially the pin bores.
4) visually inspect the pistons, use a light, magnifying glass, look for cracks, check the ring grooves with a piece of broken ring, see if they look uniform
5) if the pistons pass #4, take them to a machine shop, have them checked for cracks in the ring grooves using dye penetrant, and ask that they check the ring grooves with a gauge pin or inside mic for width and compliance to ring width specifications.

if all seems good, it probably is and I would re use the pistons with new rings, go through the bores with a ball brush.
And be sure to resolve the cause of the detonation.

_________________
Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

OOPS, sorry. I will not have any of those. Order one from Summit or Rockauto and get it pressed on...

Lou

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Home of Slant6-powered fun machines since 1988

The engine is overbored. But thank you!

This is the plan I originally had and still might go with it. I believe that the cause of the detonation was too advanced ignition timing and a lean mixture, at least it was like that when I got the car but by then it was too late for the tune up. The machine shop part might be a tricky one because they really are a rarity here where I live, I have to see if I'll find one where they will check the pistons for cracks. There are couple of shops who are able to do a cylinder head job though.

Which piston?

Anyway to determine if it was an intake manifold leak leaning out the mixture for that cylinder?

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

No intake leak but the manifold gasket seems like it was freshly put in it, the guy who sold the car told me something about replacing the intake manifold just recently because the old one was cracked.

And if the damaged piston comes apart and ruins the block and crank you'll be even less prepared for that.
IMO it's never a good idea to put damaged parts back into an engine.
Of course it's your car and your money and maybe you will be lucky.

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Some additional pics of the pisto just for a heck of it. I'll run them in a parts washer on saturday.