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accessory hole thread size?

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Old Jan 5, 2005 | 05:11 PM
  #1  
Overspendin''s Avatar
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Joined: Jan 2003
Posts: 217
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From: Garibaldi Highlands, B.C., Canada
Car: '88 IROC Convertible
Engine: ZZ4 TPI
Transmission: 5 spd.
accessory hole thread size?

I need to drill and tap another front accessory hole in my ZZ4 heads.
I thought I had a full tap and die set but I can't match the factory threads.
Anybody know the hole diameter and tap size required?
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Old Jan 5, 2005 | 05:59 PM
  #2  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You tried a regular 3/8" coarse?

It's either that or 7/16" coarse.

Memory's not clear on this. Maybe I'm mixing it up with the 396, which is the last one I fiddled with.
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