Thanks guys I will check with Dwayne when i get a few mins to see what he says. A Youtube video is the only reason i looked into it as a similar 512" made good power with a flat tappet with slight bit more duration and little less lift vs. the .690 comp. flat tappet 324adv. 290@.050 and .650lift VS. Roller 323adv. 287@.050 and .690lift both on a 108LSA. I would be happy with the power the 512" made on motor. Planning on the recommend harland sharps rockers also. Building this to run dragweek this year.

https://www.youtube.com/watch?v=UTqqc6Gu4ks