Still trying to sell it... interesting that he did not post here again... he knows we are here.
Perhaps Russ Jr would like to comment on this one. We both(and several others here as well) have contacted him several times in the past and have come up short in getting the answers/information needed to authenticate his bike. RC Engineering sold a number of double engine frames, double engine rollers, double engine "kits", parts and pieces of whatever parts you wanted, but they sold VERY few complete turn key double engine dragbikes to the public during the 1973-1974 time period where the early double engine bikes were still using the rear factory transmission. The Vance and Hines double changed all that.
I have my assumptions, but as Jim holds firm that he has all the documentation necessary to prove the bike's turn key built by RC Engineering origin, I'd just like to kindly ask him to present some of it, if only to Russ Jr. It would certainly help sell his bike, so he has a good reason to do it.
http://forums.sohc4.net/index.php/topic,118723.msg1342090.html#msg1342090George