building a new roller motor, question about heads

[roller5oh]

i found a deal on tfs twisted wedge heads. They have 2.02 and 1.60 valves. Do these have clearancing issues? Do I need special pistons? Are there only certain cams i can run???

Thanks in advance.

 

[D.Hearne]

From what I've read, they don't have clearancing issues with the 2.02 valves ( up to a point in lift and duration) over heads with 1.94's, but they do have issues with valve guide wear with the twisted layout of the valves. Anytime you get into larger valves and cams, you need to be prepared to deal with piston-valve clearance issues.