The plane I am flying this summer is a 1978 7GCBC and to my surprise today I picked up the POH and it lists the max gross as 1650lbs. I was pretty disappointed as I thought the max was 1800 and you could go 1950 if you replace the spars? Anyone know if American Champion will endorse the plane for 1800lbs and issue a new weight and balance sheet. Cripes at 1650 max and an empty of 1250 me and full gas and I'm maxxed out.