Thread: Sbc 350 vortec heads coolant out of cylinder 6 exhaust.

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You still need to determine what caused the skirt to break, they don't normally break on their own.
JMHO, but I suspect too much taper wear at the bottom of the cylinders.

Take a look

JMHO, looks like ring blow-by and uneven skirt wear. I would check the ring lands for wear and cylinders for taper.
Again just my opinion, but it's probably time for boring and new pistons.

Were the cylinders measured for wear / taper before the "rebuild"?
Or did you just hone and set in new rings?

350 short blocks are cheap. scrap it and start over .

Skirt tabs on cast pistons are very easily cracked/broken just handling the pistons while on the rods-the flip side to side against shank of rod will very easily crack and/or break off the amount of the tabb that you see in these pics-----while there are only a few pics in this thread, I see several no-no's but have received no comment back from poster

Originally Posted by 34_40

Were the cylinders measured for wear / taper before the "rebuild"?
Or did you just hone and set in new rings?

I honed and set new rings.

Originally Posted by jerry clayton

Skirt tabs on cast pistons are very easily cracked/broken just handling the pistons while on the rods-the flip side to side against shank of rod will very easily crack and/or break off the amount of the tabb that you see in these pics-----while there are only a few pics in this thread, I see several no-no's but have received no comment back from poster

What's the purpose of that tab? I have another set of pistons doesnt have them

Originally Posted by DennyW

Take a look at this article first.

Full-Round vs. Strutted: Piston Forging Designs and Skirt Styles Explained

Explained: Symmetrical, Asymmetrical, and Full-Round Piston Skirt Design

That's was an excellent article!

Originally Posted by DennyW

(Indian head)
This gets hard. Not good for that use.

Instead, use this on the threads. Works WAY better. And, it stays flexible.

High-Temp Red RTV Silicone Gasket Maker 81160

Attachment 70395

You had good experiences with the rtv?

still have a cylinder full of coolant. busted skirt wont do that .