Hiya We have done the search for info on the different types of wing spars for the RV8 series aircraft, we are looking at a project for sale. What we have learned is that the RV 7 spar parts are also used for the RV8 although the mounting holes are different and won"t interchange. Our question is about the early kits prior to the introduction of the RV7. The large aluminum bars that are machined are smaller on this kit than the later ones ? Is there less strength because of that even though the numbers quoted are the same as later kits for G rating ? Caitlin and friends