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Old 10-30-2008, 05:48 PM
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Threaded oil gallery plugs on front of SBC

Is there a compelling reason not to thread the front oil galley plugs on a SBC? I'm having a hard time getting the press-in plugs to stay in place, even with staking them. If I run a tap into the holes and seat the plugs low enough to not interfere with the cam sprocket, will I have problems? Are these plugs intended to pop if pressure gets too high? Won't the bypass handle that situation?


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Old 10-30-2008, 06:11 PM
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There are no ill effects to tapping the front oil galley holes while the block is stripped down. If the block is assembled it would be nearly impossible to tap these holes and not get chips where you don't want them so I wouldn't advise it. The only thing to be aware of is located in the galley in the center. There is a hole that runs from that galley, through to the front cam bearing, and continues down to the front main bearing. If the pipe plug is screwed in too far you will block this hole and bad things will occur. The hole I speak of sits about a 1/2 inch in the front face. If you shine a light in you will see the hole I'm referring to.
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Old 10-30-2008, 06:14 PM
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You can tap them to 1/4 NPT. There is no instance where they are intended to pop out but I dont know why GM never tapped them until the Bowtie blocks. The center galley has an oil feed hole close to the end so dont run the plug in there too far.
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Old 10-30-2008, 07:05 PM
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It is a common practice to thread the cam galley oil holes when prepping a block for hi-po use.

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Old 10-30-2008, 07:11 PM
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We do all our blocks unless it a Dart or Bowtie block
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Old 10-30-2008, 08:49 PM
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If you coat the tap in grease it will catch 99% of the filings, a magnet will get the other 1% of fines. You can fill the area behind the plugs with grease so nothing goes falling down where you can see it.

Just a trick I've used in the past.
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