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Author Topic: 16 Hole pattern for CJ Exhaust  (Read 2520 times)

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jimeast

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16 Hole pattern for CJ Exhaust
« on: June 05, 2015, 04:16:43 PM »
I have a set of C6AE-R heads with eight exhaust flange bolts.  I would like to drill for a 16 bolt CJ exhaust pattern.  Does anyone have a drawing or a sketch showing the bolt hole pattern with dimensions? 

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Phil Brown

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Re: 16 Hole pattern for CJ Exhaust
« Reply #1 on: June 05, 2015, 05:10:46 PM »
Don't have the hole layout handy. But watch the depth when you drill and tap the lower holes, might find water down there :-)
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Joe-JDC

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Re: 16 Hole pattern for CJ Exhaust
« Reply #2 on: June 05, 2015, 07:43:46 PM »
Take your CJ exhaust manifolds and lay them on the head, and install any bolts that fit, then take a center punch and centerpunch the other holes.  Drill and tap from your centerpunch location.  You will need a real center punch, not an awl to get the holes perfectly centered with the manifolds.  Joe-JDC
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Dryhoze1

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Re: 16 Hole pattern for CJ Exhaust
« Reply #3 on: June 05, 2015, 10:11:43 PM »
Use a transfer punch in the method stated above.
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427Fastback

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Re: 16 Hole pattern for CJ Exhaust
« Reply #4 on: June 05, 2015, 10:44:16 PM »
The last 2 replies are exactly how I do it....Manifold for the template and transfer punches for the hole location....
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