I am purchasing a rebuilt engine for my GN. The machine shop has offered to change the current 4 angle valve opening to either a 5 or 7 angle. Which is better for these cars. Car is mostly stock. Chip, injectors, exhaust, boost dialed up, etc. This engine came out of a GN with Nitrous that ran "high 9s" at a local track. I have talked to others who know the owner. The guy brought it in, the shop tore down the engine, and the guy left town - leaving the engine - rebuilt - ported and polished heads, polished crank and cam, new pistons, etc. The shop owner said it will be all profit as the guy had paid him for work done so he is letting me get it very inexpensively. I am the guy that my "church member Buick loving mechanic" blew it up when he was dialing it in for me while I was in the hospital having surgery. I am so THRILLED to be getting my GN back on the road!!!! Which valve job would be best?:smile: