Holley 300-561 Big Block Chevy EFI Intake Manifold, Square Bore, Single Plane, Oval Port, Aluminum, Natural, Each

$555.70
MSRP: $612.00
(You save $56.30 )
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SKU:
HLY300-561
MPN:
300-561
UPC:
90127716489
Condition:
New
Weight:
25.45 LBS
Shipping:
Calculated at Checkout

Applies To Continental U.S. orders only

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Holley EFI is excited to launch four new multi-point fuel injection intake manifolds for the big block Chevy. These new intakes are available to fit oval or rectangular port heads, and 4150 or 4500 style throttle bodies. These Intakes are ideal for converting your big block high performance or racing engine from carburetion to fuel injection. These intake manifolds were computer designed and dyno proven to produce more horse power and torque than other EFI manifolds. Each manifold package includes anodized and laser etched fuel rails, and two sets of mounting brackets (brackets allow use of 1.48" or 2.56" O-ring to O-ring injector lengths).
 
Features:
  • Open plenum/single plane design
  • No EGR provisions
  • 3000-7500 RPM power band
  • 4150 carburetor mounting flange
  • Includes fuel rails and mounting brackets
  • Designed for today's larger cubic inch big block Chevy race engines
  • Perfect for hard core drag racers in the NHRA Super Comp, Super Gas, and Street classes as well as IHRA Quick Rod, Super Rod, and Hot Rod categories
  • Oval Port Dimensions: 1.87” High x 1.60” Wide
  • Height: Front 5.96", Rear 5.96"

Instructions

Instructions - 199r10717rev.pdf

Emissions Warning
Products sold on this website may not be legal for use on public roads or highways due to Environmental Protection Agency (EPA) restrictions or California Air Resources Board (CARB) emissions regulations. Federal and State regulations may restrict Product installation to pre-emissions regulation (Model Year 1974 or earlier) or to competition/racing vehicles used exclusively in
1) events organized by recognized bodies, authorizing permits for participating drivers.
2) racing event qualification, and3) practice associated with events.
Installation
 of such products, including driving racing vehicles to and from the track, may be considered illegal “tampering ” or as “defeat device”, and may result in federal and state penalties. It is the purchaser’s responsibility to ensure compliance with all applicable emissions laws, including California’s stricter standards.

Proposition 65 Warning:
This product may contain chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Engine Block Style:
Stock/OEM standard deck
Style:
Single plane/Throttle body
Basic Operating RPM Range:
3,000-7,500
Material:
Aluminum
Finish:
Natural
Height:
5.960 in.
Intake Section Included:
Complete
Throttle Body Bore Size:
4-barrel square bore
Fuel Rails Included:
Yes
Aftermarket Fuel Rail Required:
Yes
Has Bosses:
Yes
Bosses Machined:
Yes
Boss Quantity:
Eight
Injectors Included:
No
Throttle Body Included:
No
EGR:
No
Quantity:
Sold individually.
Notes:
With square bore 4150 style mounting flange.
Make:
Chevrolet
Engine Family:
Chevy big block Mark IV
Engine Sizes:
6.5L/396-7.4L/454
Years:
1965-1990
Engine Family:
Chevy big block Gen V
Years:
1991-1995
Engine Family:
Chevy big block Gen VI
Years:
1996-2000
Engine Sizes:
7.4L/454
Cylinder Head Style:
Oval port

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