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Old 05-08-2013, 07:47 PM
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Block Petcock - Thread Issue

So I tried to install the petcock on the port side of my Indmar Chevy 350 block tonight, as I do every spring, and it strips out on me. The threads on the petcock are stripped a bit but I also feel the threads in the block are also somewhat messed up. (pinky feel)

What are my options here??

Thanks in advance.
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Old 05-08-2013, 07:55 PM
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Originally Posted by Double D View Post
So I tried to install the petcock on the port side of my Indmar Chevy 350 block tonight, as I do every spring, and it strips out on me. The threads on the petcock are stripped a bit but I also feel the threads in the block are also somewhat messed up. (pinky feel)

What are my options here??

Thanks in advance.
I seriously doubt the petcock stripped the thread in the block- most of the time, petcocks have a brass body, specifically so it won't rust in place and the dissimilar metals prevents this.

If you know someone who has taps and dies, use the tap to clear out the thread in the hole and try it again. If the petcock is definitely stripped, buy a brass plug, rather than a petcock.
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Old 05-08-2013, 07:58 PM
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The petcock is brass on purpose so that it's softer than the block. I would buy a new one and try it. You could run a tap through it to clean it up. Hopefully the new one will seal.
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Old 05-08-2013, 07:59 PM
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Originally Posted by JimN View Post
I seriously doubt the petcock stripped the thread in the block- most of the time, petcocks have a brass body, specifically so it won't rust in place and the dissimilar metals prevents this.

If you know someone who has taps and dies, use the tap to clear out the thread in the hole and try it again. If the petcock is definitely stripped, buy a brass plug, rather than a petcock.
You beat me to it. You must be a fast typer.
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Old 05-08-2013, 09:23 PM
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Thanks guys! Will do that and let you know.
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Old 05-08-2013, 09:29 PM
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I had almost the same thing happen on the starboard side with knock sensor...chased thread now keep it lubed.. don't over tighten.. problem free for 2 seasons now..
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Old 05-15-2013, 06:45 PM
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Well, the block is fine and a new Petcock is installed. All is well....
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1994 MasterCraft ProStar 205
275 HP 350 Chevy Indmar
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"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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Old 05-15-2013, 06:55 PM
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outstanding ...skie time..
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Old 05-15-2013, 07:38 PM
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When you winterize, I'd suggest you replace the petcocks with brass plugs. What you will lose in convenience, you will gain in actually getting all of the water out of the block. I have seen petcocks clog up with rust bits with relative ease. Replaced them on my MC. Also replaced them on the SN within one week of ownership. I can get the plugs out pretty fast.
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Old 05-15-2013, 07:43 PM
LittleFuss LittleFuss is offline
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see if you can find a chaser instead of a tap. You stand far less likely chase of boogering up threads. taps are hard and will cut anything. being that it is most likely a little rust in your way I go chaser...
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