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Instruction Sheets for Part Number HLY-300-121BK
Holley LS 2x4 Dual Plane Fuel Injected Intake Manifolds 300-121BK
Part Number: HLY-300-121BK
Holley LS 2x4 Dual Plane Fuel Injected Intake Manifolds
Intake Manifolds, LS 2x4, Throttle Body, Dual Flange, 1,500-7,000 RPM Range, Aluminum, Black Finish, Chevy, 4.8-6.0L, Cathedral Head, Each
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Estimated Ship Date: Oct 26, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
300-121BK
Part Type:
Product Line:
Summit Racing Part Number:
HLY-300-121BK
UPC:
090127715857
Cylinder Head Configuration:
Cathedral Port LS1/LS2/LS6
Fuel Injection Style:
Throttle body
Basic Operating RPM Range:
1,500-7,000
Intake Section Included:
Complete
Engine Block Deck Height:
Standard deck
Injectors Included:
No
Multi-Port Fuel Rails Included:
Yes
EGR:
No
Aftermarket Fuel Rail Required:
Yes
Throttle Body Included:
No
Supplemental Bosses Cast-In:
No
Supplemental Bosses Machined:
Yes
Supplemental Boss Quantity:
Eight
Runners Included:
No
Runners Removable:
No
Plenum Material:
Aluminum
Plenum Finish:
Black ceramic
Base Material:
Aluminum
Base Color:
Black ceramic
Remanufactured:
No
Quantity:
Sold individually.
Special Attention:
With cathedral port heads only.
Holley LS 2x4 Dual Plane Fuel Injected Intake Manifolds
Holley LS 2x4 dual plane fuel injection intake manifolds allow you to install dual throttle bodies on your late model LS Series engines. Their dual plane, equal-distribution layout produces great midrange torque without compromising top-end power. The manifolds feature all cast aluminum construction, a wide 1,500 to 7,000 rpm power band range, and can accept dual inline mounted 1,000 cfm throttle bodies with a 1.750 in. maximum throttle bore diameter.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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