STS -18X Series Cylinder Heads Standard Exhaust Port

Name: STS -18X Series Cylinder Heads Standard Exhaust Port
Brand: BRODIX
SKU: 158-1188103
Price: 4926.36 USD
Availability: InStock

^$4,926³⁶

Ships on 09/22/2026

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STS -18X Series Cylinder Heads

68cc Combustion Chambers

Standard Exhaust Ports

100% CNC Ported

Standard Exhaust Port
254cc Intake Ports
68cc Combustion Chambers
2.140'' Intake / 1.600'' Exhaust Valves
1.550'' Dia. Springs - 240# Seat Pressure
Titanium Retainers
Angle Plug
Assembled, 2/pkg.

Cylinder Head Specifications
Intake Port Volume: 254cc
Combustion Chamber Volume: 68cc
Valves: 2.140' dia. x 5.290' o.a.l. Intake / 1.600' dia. x 5.300' o.a.l. Exhaust ( 11/32' Stem Diameter )
Valve Springs: 1.550' Diameter - Open Pressure: 550 lbs.; Closed Pressure: 240 lbs.; Installed Height: 1.950'; Max Lift: .700'
Spring Retainers: 1.550' 10° Titanium
Rocker Studs: 7/16'
Guide Plates: 5/16'
Valve Seals: 11/32'
Spark Plug Configuration: Angled
Facts and Related Components
Torque Heads: 70 ft-lb.
Torque Rocker Studs: 40-45 ft-lb.
Intake Gasket: Brodix p/n 158-MG1800, Cometic p/n 245-C3250
Head Gasket: Fel-Pro p/n 375-1003 (350ci) / 375-1004 (400ci) or Cometic p/n 245-C5399 (350ci) / 245-C5403 (400ci)
Exhaust Gasket: Fel-Pro p/n 375-1406, Cometic p/n 245-C5415 (Standard Port)
Head Studs: ARP p/n 070-234-4727 (12-point with 3/8' center studs)
Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
Valve Angle: 18°
Angle Milling: .0065' per cc
Flat Milling: .0055' per cc
Pushrod Slots: 40/60
Stud Girdle: 40/60 Brodix p/n 158-BR6440
Rocker Arms: Standard 7/16 Roller Rockers, Shaft System with 40/60 Spacing
Lifters: Standard
Pistons: Special 18°
Pushrods: Special Length
Intake Face Angle: 10° Standard
Exhaust Pattern: Standard and Stahl
Valve Centerline: 40/60
Spring Pockets: 1.550' Out of the Box, May be cut to 1.625' - No larger or deeper
Accessory Bolt Holes are Drilled
Recommended Intake Manifold: Brodix HV 1800 (p/n 158-HV1800) / HV 1801 (p/n 158-HV1801)