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FE Power Forums => FE Technical Forum => Topic started by: jimeast on June 05, 2015, 04:16:43 PM

Title: 16 Hole pattern for CJ Exhaust
Post by: jimeast 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? 

Title: Re: 16 Hole pattern for CJ Exhaust
Post by: Phil Brown 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 :-)

Title: Re: 16 Hole pattern for CJ Exhaust
Post by: Joe-JDC 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

Title: Re: 16 Hole pattern for CJ Exhaust
Post by: Dryhoze1 on June 05, 2015, 10:11:43 PM

Use a transfer punch in the method stated above.

Title: Re: 16 Hole pattern for CJ Exhaust
Post by: 427Fastback 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....