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Holley Performance 300-121 Hi-Ram Lower Manifold

4925370 - 300-121

EFI 2 x 4 Mid Rise Dual Plane Manifold - Front Height 4.47 in. - Rear Height 5.54 in. - RPM Power Band 1500-7000 - Satin Finish

300-121 Hi-Ram Lower Manifold Holley Performance

View the Full List of Automotive Applications »

Pricing: $461.95


Holley Performance - Hi-Ram Lower Manifold - Part#: 300-121 Features:

  • Traditional Dual Holley That Competed On Drag Strips In The 1960s
  • Dual Plane Equal Distr. For Mid-Range Torque w/Top End Power
  • Carbureted and EFI Versions Available
  • Power Band From 1500-7000 rpm
  • Cast Aluminum Construction
  • Carb Flange Center-To-Center 8-5/8 in.

Product Documents:

View the Full List of Automotive Applications »

Below is an abbreviated list of applications for the Hi-Ram Lower Manifold.
Camaro, Corvette, CTS, Firebird, GTO, Cadillac, Chevrolet, Pontiac, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998, 1997


Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR Sprint Cup team and nearly every NHRA Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Exhaust, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.


  • 4925370 - 300-121
  • 4925370
  • 300-121
  • 090127671078
  • Holley Performance
  • New

Shipping Information

  • Item Requires Shipping
  • 25.0 lbs.
  • W14.5000” x H10.0000” x L20.5000”

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