18 Degree Chevy Cylinder Head
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Small Block Chevy 18 Degree

$2,499.92$5,402.80

CHI CNC ported 18′ degree heads have been developed in conjunction with top US head porter Phil Martin, capitalizing on Phils 20+ years of top tier cup and dirt track experience has created high end range of heads at an affordable price,  for circle track or drag racers who want to benefit from huge horsepower increases over traditional performance chevy heads. The CHI 18 degree head features re positioned valves, moving them closer to the bore centreline significantly increasing potential flow to suit power well over 700HP.

The price listed is for a pair of heads.

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SKU: SBC18 Categories: ,

Product Description

CHI small block Chevy 18 degree heads benefit from a 1” higher intake port than conventional 23 degree heads.

CHI CNC ported intake and exhaust ports are designed for circle track or drag racers who want to benefit from huge horsepower increases over traditional performance chevy heads. The CHI 18 degree head features repositioned valves, moving them closer to the bore centreline significantly increasing potential flow to suit power well over 700HP.

As standard these heads come as standard with CNC machined combustion chamber,  extra thick decks suitable for forced induction or nitrous applications. As cast intake ports are CNC matched to Felpro 1282 intake gaskets.

You have the option of bare heads or complete assemblies ready to bolt on. CHI 15 and 18 degree heads do not require any custom components, hardened valve seats and CHE Bronze Alloy valve guides make these heads suitable with unleaded fuels.

 

SBC 18 PM 260

Head ModelPart No.AssembledChamberValve Sizes
Intake
Valve Sizes ExhaustExhaust PatternIntake ManifoldApplication
18 Degree 226ccSBC18226B-55Bare55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
SBC18226B-64Bare64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
SBC18226C2-55Street/Strip55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18226C2-64Street/Strip64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18226C3-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18226C3-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18226C4-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18226C4-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18226C5-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller
SBC18226C5-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller
18 Degree 254ccSBC18254B-55Bare55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
SBC18254B-64Bare64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
SBC18254C2-55Street/Strip55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18254C2-64Street/Strip64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18254C3-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18254C3-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18254C4-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18254C4-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18254C5-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller
SBC18254C5-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller
18 Degree 240ccSBC18240B-55Bare55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
SBC18240B-64Bare64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
SBC18240C2-55Street/Strip55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18240C2-64Street/Strip64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18240C3-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18240C3-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18240C4-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18240C4-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18240C5-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller
SBC18240C5-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller
18 Degree 260ccSBC18260B-55Bare55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
CNC PortedSBC18260B-64Bare64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995
SBC18260C2-55Street/Strip55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18260C2-64Street/Strip64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Street/Strip Flat Tappet/Hyd Roller
SBC18260C3-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18260C3-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Solid Flat Tappet
SBC18260C4-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18260C4-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Strip Mild Solid Roller
SBC18260C5-55Competition55cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller
SBC18260C5-64Competition64cc2.180 X 5.4501.620 X 5.450SpreadEdelbrock 2995Race Solid Roller

Additional Information

Cylinder head type

226cc, 240cc CNC Ported, 254cc, 260cc CNC Ported

Assembly

Bare, C2 – Street/Strip Assembly, C3 – Competition Assembly, C4 – Competition Assembly, C5 – Competition Assembly

Chamber Volume

55cc, 64cc