HI-RAM SERIES: These tunnel ram Manifolds are used primarily in drag racing, tractor/truck pulls and performance marine applications where high RPM performance is required. The effective RPM range is between 2,800 to 8,000 RPM. The Weiand Hi-Ram, with it's patented D-shaped port runners and large plenum chamber, provides optimum velocity of the air/fuel mixture to the cylinder head intake ports. For maximum performance in a naturally aspirated competition application, the Weiand Hi-Ram is the Manifold of choice! This Manifold is designed to be used with performance oval port heads.

Installation Notes: GM HEI will not clear, Use Side-by-Side 2 x 4 Tunnel Ram Carburettor Linkage Kit # 4022. When using Carburettors with vacuum operated secondaries, use Diaphragm Housing Covers # 20-28, for more even and balanced secondary operation. Will fit tall blocks with use of Weiand P/N 8206 Manifold spacer plate kit.

ong>Features

• 2 x 4 carburettor top
• Square flange carburettor mounting
• 2500-7800 RPM power band
• Special D-shaped port runner design
• Large volume plenum
• Power band: 2800-8000 RPM
• Height: Front 10.12", Rear 10.93"
• Port Size: 1.82" height 1.60" width

Product Reviews for WM1981 - WEIAND