Need pistons for a stock rebuild 350 TBI

[Diver]

I was pulling a piston out a stock 89 chevy 350 tbi to re ring it and dropped a piston and broke off a skirt. Can anyone lead me in a direction to buy piston setup for it to stay in stock compression ..This engine came out of a 1989 van . I was surprised to see a it had a 4 bolt main. . it was running when i bought it and yard pulled it and set it in back of truck No oil sludge. thanks all

You must be registered for see images attach

You must be registered for see images attach

 

[Erik the Awful]

If the pistons were made of unobtainium you could still run that, but there's no reason to try with a 350 TBI.

Beat the bushes. Ask around. Somebody you know has that piston sitting in the corner of their shop, or a complete TBI motor in their shed. If you were in Oklahoma I'd throw you one - I have a set of seven sitting in a tub in my shop.

Also, check with your local machine shops.

 

[Schurkey]

Those are still available new in the aftermarket; although the compression height may be sabotaged -0.010.

 

[Road Trip]

I was pulling a piston out a stock 89 chevy 350 tbi to re ring it and dropped a piston and broke off a skirt. Can anyone lead me in a direction to buy piston setup for it to stay in stock compression ..This engine came out of a 1989 van . I was surprised to see a it had a 4 bolt main.

You must be registered for see images attach

The extra notch at ~the 10 o'clock position (assuming the forward notch is 12 o'clock)
plus the fact that the engine was a 4-bolt main makes me think that your engine was the
HD TBI 5.7 that were put in the 8600+ GVWR GMT400s. They were slightly lower compression,
and the assumption is that this was done to help compensate for the expected HD service.

For what it's worth, here's a link where we were troubleshooting why one cylinder had higher
compression than the rest? (New piston is different than the original 7?)

Hope this gives you some additional insight into the HD motor you are refreshing.

Cheers --