porting question

[gearhead13]

Where's the pictures? Ray.

Maybe if I had a before picture you would be able to tell....

[trippivot]

since I got the stone seat grinder my valve jobs have gotten much better over a neway cutter only.

Tom Klemme and I messing around have a new belief on that DEEP deep 60 degree cut. we have a flowmaster 110 at the shop and have gained 5 + C.F.M. on that cut and a fine valve job . no porting at all just seat attention.

1 angle = stock 45 valve 46 seat
3 angle = better 45 valve 30,46,60 seat
5 angle = more tools more cost more performance
7 angle = you get the idea
radius = much work and that last tenth of a percent of potential.

[gearhead13]

If you have the tools, then exotic multi angle valve jobs can help.
But for me the $250 the machine shop wants to do a valve job isnt worth it for the 5 cfm gain.

[rapidray]

since I got the stone seat grinder my valve jobs have gotten much better over a neway cutter only.

Tom Klemme and I messing around have a new belief on that DEEP deep 60 degree cut. we have a flowmaster 110 at the shop and have gained 5 + C.F.M. on that cut and a fine valve job . no porting at all just seat attention.

1 angle = stock 45 valve 46 seat
3 angle = better 45 valve 30,46,60 seat
5 angle = more tools more cost more performance
7 angle = you get the idea
radius = much work and that last tenth of a percent of potential.

Actually, I use a Serdi machine & the radius cutter is a 1 piece, 1 pass cutter with the seat angle & the top & bottom radius machined into the cutter. It is WAYYYY faster than stones & is a 1 cut for each seat deal! Also, the radius cut over a 3 angle is about the same 5 CFM additional you found with the deep 60 degree cut. Ray.

[hp1000s]

Does the radius seat treatment do a good job at heat transfer from valve head? Does it last(wear) as long as an angled cut?

[Old Colt]

Yes, the radius cutters provide a flat seat area. There are many cutters available for different head, port and chamber configurations. They can provide seat widths from 0.010 to 0.060 or so.

[82Shafty]

I was going to add that as long as you maintain the proper seat width heat transfer will be the same if your using the same cam that allows for the same seat time.