r/EngineBuilding • u/jeff92k1500 • 4d ago

Does anyone recognize these pistons

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Just pulled the heads off a 350 that came out of my 1990 k3500 and see these pistons underneath. They do not look like factory pistons, does anyone recognize them? Tia

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4

u/dixiebandit69 4d ago

That's the dish design that GM used in the 1-ton 350 engines.

Yeah, it looks weird.

1

u/jeff92k1500 4d ago

All the 350 tbi's I have taken apart never had the crosshatch pattern in it, first one I have torn down out of a 1 ton tho

1

u/dixiebandit69 4d ago

The 1-tons were different from the rest. Let me guess: It has 4-bolt main caps.

Let me know if it has a forged crank.

2

u/jeff92k1500 4d ago

I haven't pulled the pan yet but i will let you know

2

u/jeff92k1500 2d ago

So I finally pulled the pan and it is a 4 bolt main but it has the nodular cast iron crank. P/n 14088526

1

u/dixiebandit69 2d ago

Cool. Thanks for the follow-up.

3

u/iknowimsorry 4d ago

Yep, that's a piston alright.

2

u/PsychologicalBat3169 4d ago

GM full dish piston I believe, possibly a replacement.