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1/8 or 1/4 npt tap block off plate? Turbo takes 4an

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Old 11-26-2016, 11:12 PM
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Default 1/8 or 1/4 npt tap block off plate? Turbo takes 4an

I've read different results over the years. What are you guys doing with 4an turbo feed lines tapping into the block off plate above the oil filter.
Old 11-27-2016, 01:52 AM
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1/8 npt for me
Old 11-27-2016, 10:23 AM
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1/8 npt here too
Old 11-27-2016, 11:40 AM
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The existing hole that is already in it is about 11/32, you just have to put it all the way through, its partly there already, cast into the part. I'm not sure it would be possible, if you were able to tap it 1/4" it would be super thin walled, and I would think weak.
Old 11-27-2016, 07:48 PM
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Drilled it 11/32 and tapped it to 1/8 npt.

Looks like it will work fine, just have read things over that past 5 years of this build. You know how stuff changes over the years. What used to work is now obsolete etc.
Old 11-27-2016, 08:17 PM
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well if you have the turbo feed line going in, you have to be nearing the goal!
Old 11-27-2016, 08:53 PM
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Close. I've got a build thread in the conversion and hybrid section. I should have it.moved over to forced induction. More traffic and hopefully more conversation. Aka better ideas



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