High rpm type 4 Options

[r_towle]

What is a street able motor (valve train) set of materials that could sustain 7k rpms ?

So, what valve material, spring materials, push rods, lifters etc.

No ceramic lifters unless they are out on the market again.

Rich

[DBCooper]

There it is, the only material you need is cubic money. So is your question about materials all answered-up now, Rich?

Actually you really need to tell us more. Do you just want to spin the motor, get RPM's for bragging rights or something, and not necessarily for higher HP? Need any torque along with the HP? They're all "streetable" to some degree, so drag race motor? Salt flats? Refreshed twice a month, or once a year? Daily driver? Money no object?

I think Pauter still makes aluminum needle bearing roller rockers, and you could probably even turn up a couple of their old race heads if you look a little. They're "streetable," but just barely, and depends on the street. If ceramics are out I think CB has an adapter sleeve to use lightweight T1 lifters in a T4 case. That or make the adapters yourself for the lighter lifters and cut to length aluminum alloy pushrods, Summit or Jegs. You'll probably want fuel injection, 24 flavors of that, depending on your wants and needs. I was at to the U.S. and World Touring Car Championship races at Sears Point last weekend and saw several cars using MegaSquirt, so no stigma there, no limits. CB ITB's for show or race, or one big TB for the street. You'd probably want a new forged crank sized for T1 H-beam rods, for the cost and weight, and probably LN's nikasil cylinders and pistons, but that depends on how much money you think all this is worth. And depending on your answer to that question about money or HP being more important, Len Hoffman's heads, springs, titanium retainers.

All that being said I've never built an engine like that, way too much for my budget. Choosing between all those headaches and the cubic bale of money or a radiator, I chose the radiator.

Ah, re-reading the question you only asked about the valve train, so forget the comments about crank and rods, throttle bodies and such.