intake throat and valve size

nads.com wrote: So you want a bigger intake valve. Where does the increased flow come from?

Is the inside of the valve seat made larger all the way through? Or

is the valve side only modified to blend to the existing throat taper and dia. ?

If I turn down my valves smaller, opened the throats cut in some angles, did

I just ruin my head or am I going to go faster?

:woohoo: Are the throats on the j heads larger diam?

Dont want too many questions, this should be enough for now.

I'm talking getting hp out of these and how much you gain with the bigger valve.

I gotta have a good head to put a good carb on, I have to heads that are done

Identical.

nads.com wrote: So how is this done, this machining for the bigger valve :blink:
This is a serious question :laugh: A scary one... :huh: If you know how this is done and
speak on it, you will be exected instantly, so go ahead lay it out...

z1kzonly wrote: Did I see a question earlier about that small crack between plug hole and valve seat?....

z1kzonly wrote: Your right Larry, it is the aluminum of course. The seats don't crack.
the type was wrong. I was not takling about same head.

I was just talking in my brain and typing to myself.

I have an old Z1 Turbo head that has Manley oversize valves and old school R C Eng.
Valve retainers that are anodized "Teal" color? They are aluminum, I think?
I am not lucky enough to have them Titanium.
This head was done by "Jerry Branch!" from Branch Flowmetrics! How old is this?
They are going to ebay, 8 stainless valves, springs, retainers and keepers (which are rectangular)
37.5mm intakes and 31mm exhaust valves. They are swirl polished.

I have another smog head with the crack, that head is complete but I see that damn crack!.
I don't have much time to type so, I'll post a pic later.