Randy, As justification for the 337, you can purchase the STC for 1320 lb. gross weight and point out that this puts the plane in the identical configuration as the O-200 STC for the D model.
You may need to purchase the O-200 STC as well to use it for approved data. Contact Skyport for more information. Here's contact information: http://skyportservices.net/ I'm expecting you ought to be successful but get the paperwork approved before you spend thousands of bucks. Ed Burkhead http://edburkhead.com/Ercoupe/index.htm East Peoria, Illinois ed -at- edbur???khead.??com (remove the ? marks and change -at- to @)
