461 heads flow numbers - Duke et. al.

[Clem Z.]

do the valves have a back angle cut?

this will help low lift flow. a change to 30 degree intake seat will also help low lift flow

[Clem Z.]

do the valves have a back angle cut?

this will help low lift flow. a change to 30 degree intake seat will also help low lift flow

[Don C.]

Re: do the valves have a back angle cut?

Clem
They do NOT have the back angle cut yet. I will do that before I take the heads back for a flow test following my attempt to pocket port one of the cylinders. At this point only one cylinder has been done by the machinist. I will do the rest of the cylinders. I was planning to do the back cut on only the intake valve a to do a radius on the combustion chamber side of the exhaust valve. Does this fit with your thinking?

Don

[Don C.]

Re: do the valves have a back angle cut?

Clem
They do NOT have the back angle cut yet. I will do that before I take the heads back for a flow test following my attempt to pocket port one of the cylinders. At this point only one cylinder has been done by the machinist. I will do the rest of the cylinders. I was planning to do the back cut on only the intake valve a to do a radius on the combustion chamber side of the exhaust valve. Does this fit with your thinking?

Don

[Don C.]

Re: the ID of the intake port at the valve should

Bryan
Thanks for sharing.

Don

[Don C.]

Re: the ID of the intake port at the valve should

Bryan
Thanks for sharing.

Don

[Clem Z.]

Re: do the valves have a back angle cut?

back cut both valves. did you get my pictures and flow sheets is sent?

[Clem Z.]

Re: do the valves have a back angle cut?

back cut both valves. did you get my pictures and flow sheets is sent?

[Don C.]

Re: do the valves have a back angle cut?

Got 'em and studying them.

Many thanks
Don