Ok guys, everybody take a breath!! First off, let me thank both of you guys for your input. Rumblefish, I see what you mean about using either valve but it sounds like alot of machine work and hassle, but it could be done. AAR, I really appreciate your advice and the pics are a huge help. I see that my heads are cast with the 810E so I guess I have the long valve style. You have successfully answered my question about what exactly I have. Now, who the hell makes a valve for this application? My MP parts catalog lists some at 5.29" exhaust and 5.28" intake. Sound right?