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Weiand 1981 Hi-Ram Intake Manifold 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.Features: 2 x 4 carburetor top;Square flange carburetor 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" widthInstallation Notes: GM HEI will not clear, Use Side-by-Side 2 x 4 Tunnel Ram Carburetor Linkage Kit # 4022. When using carburetors with vaccum 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.
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