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onoj5 Jun 10th, 04, 6:41 PM I have both the cutting tools from comp for cutting the seat and valve guides. I cut the seats out but i can't figure out if i am cutting the guide right. It looks awful thin. Can anyone help me i could take pictures if need be. Bob West Jun 12th, 04, 6:55 PM ttt...I can't help,bought the ones for my sons truck already done by scoggin dickey...surely someone can help. Its possible that with the Z28 springs,they didnt have to be cut at all. jakeshoe Jun 12th, 04, 7:19 PM With z springs they must be cut.. What cutter do you have, PN? or diameter .500 or .533 OD? Wolfplace Jun 12th, 04, 7:51 PM Jake, With a Z spring most must be cut,, some have a smaller boss at the bottom & will accept them. Comp's tool is .530 & I'm guessing he figured it out as he was asking where to buy seals in a different post. ;) jakeshoe Jun 13th, 04, 12:05 AM Are the newer ones machined different Mike? Been a while since I did a set. Or are the two different castings machined different? I've been cutting them to .500, need to order a .530 cutter though. Wolfplace Jun 13th, 04, 1:38 AM I think it was just some of the earlier ones as the last few I bought had to be cut. I'd say on most you are right they will need cutting. You know GM,,, never say always :D bored&stroked Jun 15th, 04, 2:09 AM I bought vortec heads from SDPC back in 98, and those need to be cut as we speak using HD z28 springs. jakeshoe Jun 15th, 04, 2:19 AM Well, What casting numbers do you guys have? I think I worked with 062's, they were OEM heads not service replacement or over the shelf stuff. This was before the Vortecs were popular, very little intake selection at the time. I also did a set of 520's? 305 Vortecs.. They all needed cutting. Wondering if the 906's? don't... I did one set using Z springs and no damper coil inside.. worked great. Wondering if they are machining them different now, or if it was luck of the draw, or a specific casting number got machined different.. jakeshoe Jun 15th, 04, 2:21 AM I always laugh when I read you can't go more than .470 lift with Vortecs, etc.. The first set I did I used the Z springs, didn't have a cutter, it was a budget circle track build. Used the positive VG seals, .525 gross lift mechanical cam, and it would clear with no lash, but BARELY...Figure .018 lash clearance smile.gif | ||