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- -18X Series Cylinder Heads
- Spread Exhaust Port
- 244cc Intake Ports
- 68cc Combustion Chambers
- 2.140'' Intake / 1.600'' Exhaust Valve Sizes
- Angle Plug
- Bare, 2/pkg.
This head is sold as an unassembled bare casting. It is finished machined and includes valve guides and valve seats installed. This head does NOT include studs, valves, springs retainers or locks.
Cylinder Head Specifications - Intake Port Volume: 244cc
- Combustion Chamber Volume: 68cc
- Valve Sizes: 2.140' Intake / 1.600' Exhaust ( 11/32' Stem Diameter )
- Spark Plug Configuration: AngledFacts 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: Brodix p/n 158-MG52464 (trim to fit), Cometic p/n 245-C5424 (Spread 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: Stahl only
- 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)
Big Horsepower Maker for Budget Racers!
18° Intake & Exhaust Valve Angles
The Brodix Small Block Chevy -18X Series Aluminum Cylinder Heads offer the best of both worlds, 18-degree horsepower without using expensive shaft rockers or offset lifters. This head offers a dramatic horsepower increase over the previous 23° cylinder head. Several advantages of the -18X are intake ports that flow over 320 cfm out-of-the-box, an intake valve size of 2.140, raised intake ports, and shallow combustion chambers.
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The -18X is an excellent choice for the budget-minded racer who wants to go fast. Every casting is poured from A-356 virgin aluminum and tested before Brodix utilizes their in-house processes such as finish machining and heat treating to assure that you receive the best products for your hard-earned money. The industry standard has been taken to the next level with modernized CNC porting. Other features include a thick deck surface that is compatible with nitrous, drilled and tapped holes on the ends for standard drive accessories, phosphorous bronze valve guides and interlocking valve seats installed. Sold in Pairs. | |||
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