I am new to this site and enjoying the topics ,I currently have an old JD 510 L/B a cub cadet 16 and have just aquired a 646 (77) and a 448 (80) , building one out of two well used tractors,both onan powered, so will be here often I suspect,thank you for this forum, and I have yet to find the tech section, with manuals and such ,as they would help immensely . Bob.