Street Cruser
The valves are Ford 289
SEV 2564-S intake 1.840 head diameter
also available as SEV 2564 intake 1.780 head diameter
SEV 2563 exhaust 1.450
11/32 stem
these valves are .096 longer than a stock slant six valve, the extra .100 gives more room for a taller spring but can require custom length push rods and maybe rocker shaft shims depending upon how much is trimmed from the block - head surface and the cam lob diameter.
These are the port flow series and can be found at SI valves
http://sivalves.com/pdfs/2016-SI-Catalog.pdf
I have a flow bench that I use to verify my porting work.
A business co worker / friend has valve seat - valve guide machines so I can get the heads and valves finished exactly how I want them.
Very little work was done in the intake and exhaust port arms. A lot of work was done in the port bowl and the valve seats.
And yes the combustion chamber in the head was opened to clear the intake valves. I believe that a standard Fel Pro or Mahle 3.500 stock head gasket will still work, if the fire ring on the gasket is not fully supported I will use an Aussie Speed OS head gasket.
The valves are Ford 289
SEV 2564-S intake 1.840 head diameter
also available as SEV 2564 intake 1.780 head diameter
SEV 2563 exhaust 1.450
11/32 stem
these valves are .096 longer than a stock slant six valve, the extra .100 gives more room for a taller spring but can require custom length push rods and maybe rocker shaft shims depending upon how much is trimmed from the block - head surface and the cam lob diameter.
These are the port flow series and can be found at SI valves
http://sivalves.com/pdfs/2016-SI-Catalog.pdf
I have a flow bench that I use to verify my porting work.
A business co worker / friend has valve seat - valve guide machines so I can get the heads and valves finished exactly how I want them.
Very little work was done in the intake and exhaust port arms. A lot of work was done in the port bowl and the valve seats.
And yes the combustion chamber in the head was opened to clear the intake valves. I believe that a standard Fel Pro or Mahle 3.500 stock head gasket will still work, if the fire ring on the gasket is not fully supported I will use an Aussie Speed OS head gasket.
