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18cc 32/27mm 5mm Tillotson Big Valve Head CNC ported
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18cc 32/27mm 5mm Tillotson Big Valve Head CNC ported

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$299.99
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Product Code: TIL-1BV18P-2-
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CNC Ported 18cc 32/27mm 5mm Tillotson Big Valve Head CNC ported
The Head comes with 32mm intake and 27mm exhaust valves: 5mm stems. Precision multi-angle job, Valve Bowl Area, Cleaned up to match the seats. the valve work is performed on Rotter Seat & guide machine 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 of the art multi-axis HAAS machines. CNC ported rather than hand porting makes each port job consistent and accurate from head to head. This also reduces the cost of labor to make it more budget-friendly. Springs, retainers, rockers, gaskets, seals, or valve cover are omitted.
Head Specs:
  • Intake: 32mm,5mm
  • Exhaust: 27mm, 5mm
  • Combustion Chamber: 18cc, Non-Hemi
  • Multi-Angle Valve Job
  • CNC Ported
Compression Ratio Examples (Final results will vary on Engine measurements)
Predator hemi, Flat Top .035 Deck Height
w/.045 Thick Head Gasket 10.48:1
w/.010 Thin Head Gasket 12.19:1
Tillotson 212, flat top .000 Deck Height
w/ .045 Thick Head Gasket 10.48:1
w/ .01 Thin Head gasket
Tillotson 225, Flat Top .000 Deck height
w/ .045 Thick Head Gasket 11:01:1
w/ .032 Thin head gasket 11:49:1


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