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Author Topic:   sbc 350 rear oil galley holes striped
Dirt Freak

Total posts: 217
posted October 19, 2005 04:52 PM  
Preping a sbc 350 and the three external oil galley plug threads are stripped.
The three that surround the cam from rear of block. They no longer seem to have a tapper. They don't bottom out when I tighten them. These are 1/4"-18 pipe thread.

What is the proper way to repair the threads?

MOD 4s
Dirt Roller

Total posts: 17
posted October 19, 2005 05:31 PM  
they should be 1/4 pipe try retapping the threads

[This message has been edited by MOD 4s (edited October 19, 2005).]

James Ott
Dirt Maniac

Total posts: 131
posted October 20, 2005 05:07 AM  
When tapping the holes, don't run the tap to deep. Stop and test the plug as you go. When you can put the plug in and turn 3 full turns with very little resistance your there. Tighten in your plug and it should be good.
Try different plugs as the are all not alike.

[This message has been edited by James Ott (edited October 20, 2005).]

Dirt Full Roller

Total posts: 65
posted October 20, 2005 06:21 AM  
if they are pipe thread they should be 1/4 20 not 1/4 18.

Dirt Freak

Total posts: 205
posted October 20, 2005 11:34 AM  
If they are already 1/4" npt , then you can do a couple things. you can use an epoxy to tighten them up, or run the pipe plug in and get it flush and peen around them as they are always going to have pressure from the inside out. or even just run them in and epoxy them completely over from the outside. the rears arent as much of a problem but in front ya cant cover the inner oil gallery with the plug( first shortblock I bought had the middle partially covered and it slowly ate itself in about 2 hours run time....

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