Manley Valve Question

68 amc wrote: I run the mopar valves or Milodon 2.08 &1.74 they are 3/8 stem ,Chevy are 11/16

BTW I do not install larger valves in iron heads any more.I've had very good success with 2.02/1.625 sbc valves. You get a port that is less likely to flow separate at high lift and an overall more efficient port. The iron head csa is all wrong for a larger valve. Of course it can be done, and can be made to work well, but to do it properly and get anywhere close to a proper port design is an absolutely insane amount of work. In todays world if you need a valve that big go buy the heads with the proper design to begin with - it's a lot cheaper and more effective.

Good comments on the Chrysler valves.  Heavy and short.  By using a SBC intake and a Ford Exhaust you have choices of 2.02, 2.05 and 2.08 for intakes and 1.6, 1.65  chevy, 1.71 or 1.76 ford for exhaust.  So you can match valve size to whatever your goals are.  For high lift flow, 45 degree seat is usually preferred.  Not sure how to cut a 45 degree seat and not go to a bigger valve.  My opinion is 2.05/1.71 is close enough to stock it doesn't hurt anything.  Advantages are you can pick the length, material, and size to suit the application and valve spring you want from a wide variety of choices and get a significantly lighter valve.  I also think it is relatively easy to put an 11/32 valve guide insert in the stock guides and most of the heads I have seen lately are wallowed out pretty good on valve seats and valve guides.