EC CNC Ported Big Valve Head using the Tillotson JT-207 Cylinder Head. 

The Head Comes with 32mm Intake and 28mm Exhaust Valves; 5.5mm Stems. Precision Multi-Angle Job, Valve Bowl area, cleaned up match to the seats. The valve work is performed on Rotter Seat & Guide Machine for accuracy and precision. Heads are vacuum checked after the valves are installed to ensure your air-fuel mixture and combustion happens in the cylinder. The Heads Milled to ~18cc Combustion Chamber. The Cylinder Head is CNC Ported on our state heart multi-axis HAAS Machines. CNC porting rather than hand porting makes each port job consistent and accurate from head to head. This also reduces the cost of the labor to make it more budget-friendly. Springs, Retainers, Rockers, Gaskets, Seals, or valve cover are omitted. 

Head Specs:

Intake: 32mm, 5.5mm

Exhaust: 28mm, 5.5mm

Combustion Chamber: 18cc, Non-Hemi

Multi-Angle Valve Job

CNC Ported

Compression Ratio Examples(Final Result will vary on Engine Measurements):

Predator Hemi, Flat Top, .035” Deck height,

w/.045” Thick Head Gasket 9.22:1

w/.010” Thin Head Gasket 10.48

Tillotson 212, Flat Top, .000” Deck height,

w/.045” Thick Head Gasket 10.48:1

w/.010” Thin Head Gasket 12.19:1

Tillotson 225, Flat Top, .000” Deck height,

w/.045” Thick Head Gasket 10.87:1

w/.032” EC Copper Head Gasket 11.49:1

EC 228R, Flat Top, .000” Deck height,

w/.045” Thick Head Gasket 11:01:1

w/.032” EC Copper Head Gasket 11.63:1

EC 236R, Flat Top, .000” Deck height,

w/.045” Thick Head Gasket 11:37:1

w/.032” EC Copper Head Gasket 12.01:1