Holden 253 308 Downdraft EFI Stack Intake Manifold System Complete Polished

Brand:	Speedmaster
Part Number:	1-148-012
Part Type:	Intake Manifold, Fuel Injected
Engine Block Style:	Stock/OEM standard deck
Injection Style:	8 Throttle body
Basic Operating RPM Range:	Idle-7,000
Intake Trumpets:	Intake Trumpets Included
EGR:	No
Injectors Included:	No
Fuel Rails Included:	Yes
Throttle Body Included:	8 Pieces
Base Material:	Aluminum Casting
Base Finish:	Polished
Assembled:	Assembled
Quantity:	Sold as a Kit

The Speedmaster Individual throttle body EFI system have all the flash of classic Weber induction but provide higher state of tune and engine performance versatility of EFI. Delivering crisp EFI performance with systems capable of supporting high hp. Fuel and air is delivered through precision cast aluminum 50mm IDA style throttle bodies that allow for superior idle characteristics and astounding throttle response while improving emissions and economy through tight air/fuel ratio control. Speedmaster linkage set incorporates the throttle stops, idle controls, lever arms and joiner/balancer all in one. It also features a single screw adjustment for calibrating front to rear throttle shafts. The bell crank has a fully indexable eccentric cable pulley that enables good slow speed drivability and still attain full throttle geometry. Speedmaster throttle bodies have the following feature: - CNC machined, Heat treated 601 Cast aluminum. - Butterflies are measured for each bore & precision machined to a closer tolerance. - Butterflies are secured to centerless ground brass shafts with split screws to ensure reliability and service ability. - O-ring seals on lower mounting faces.