This info from Pro RC web page I believe is more accurate.

I checked my engine and the dimensions match the diagram from Pro Rc post #16

DA lists 38 mm for the bolt spacing as well for the 60/120. It was my impression that they were slightly different?

I ordered a set of Da 100 headers they are really similar in size I think with a little work with a Dremel or file they will fit just fine I will check it out and post results

Originally Posted by Festivus

I ordered a set of Da 100 headers they are really similar in size I think with a little work with a Dremel or file they will fit just fine I will check it out and post results

How did the DA 100 headers work out? bolt right up to the 123?

I have a set of DA 100 headers on my GP 123. You need to adjust the bolt holes
side-ways a bit with a chain saw file to get them to bolt up. Don't remember
which way, but easy enough to do.

I have been side tracked, I have not messed with the headers, I have been building a 43% Edge.

Plane bender. Dave want to order a set of adapter plates please pm me Rich

Originally Posted by loop an roll

Plane bender. Dave want to order a set of adapter plates please pm me Rich

May be more efficient if you contact the business.
http://www.planebenderproducts.com/page-3/index.html

I got a set of adapters from dave for my da 120 headers..they work great. Simply bolt on and no issues

If anyone has a stock set of GP 123 mufflers for sale please send me a PM.

Hi guys, Just now looked at this thread. If anyone needs Flange adapters you can either contact me directly at: planebender@sbcglobal.net
Or use the web site to order:
www.planebenderproducts.com

Dave

Ha!!!! I have been wondering whom it was that made those for a good month now. Thanks for posting. I'll order a set Wednesday!!

Originally Posted by Muttdog

If anyone has a stock set of GP 123 mufflers for sale please send me a PM.

PM sent....

PM replied thank you