Holley 0-82851SA 850 CFM Aluminium Street HP Carburettor - 4150 Mechanical Secondary, Polished

Genuine Holley 0-82851SA — 850 CFM Aluminium Street HP four-barrel carburettor. Brand new in factory box.

The Street HP takes the contoured main body from Holley's race-bred 4150 HP series and tames it for street and light competition use. Tumble-polished aluminium construction drops around 40% of the weight of a comparable zinc carb, and the screw-in air bleeds make it genuinely tuneable rather than a set-and-forget unit. Calibrated out of the box for a hot street/strip combination — strong throttle response with real drivability.

Specifications

• Part number: 0-82851SA
• Model 4150 HP, 4-barrel, square bore flange (5 3/16" x 5 5/8")
• 850 CFM
• Mechanical secondaries (double pumper)
• Dual feed fuel inlets — 5/8-18 inverted flare
• Throttle bore 1.688" / venturi 1.563"
• Down-leg boosters
• Primary main jet 82 / secondary main jet 82 / power valve 4.5
• No choke — petrol only
• Tumble-polished aluminium finish

Features

• Four-corner idle for precise idle control
• Screw-in air bleeds for accurate tuning
• Dual accelerator pumps
• Timed spark port for vacuum advance distributors
• Street HP base plate with ample vacuum ports for power brakes, PCV etc.
• Compatible with GM, Chrysler and Ford auto kickdown linkage (additional parts may be required)
• 100% wet-flow tested by Holley before shipping

Suits

Best matched to lightweight cars with a manual gearbox, or autos running a high-stall converter and low diff gearing. Ideal for a healthy 350–427ci small block, 383 stroker, or a big block on a single-plane manifold.

Note: this carburettor is emissions code 3 — intended for uncontrolled or competition vehicles.

Questions on jetting or fitment? Give the workshop a call — happy to help you get the right combination.