Proform Harmonic Balancer Cover - 6.75 in. 57-58 All BBK mass air meters

All BBK mass air meters are CNC Machined large bore aluminum housings with a custom BBK calibrated electronic sensor placed on top to accurately measure air flow for accurate air fuel ratios and maximum performance

Stainless Internal Screen

The reverse idler gear (shown in blue) is not engaged with any other gears

8 qt With Filter

Proform Harmonic Balancer Cover - 6.75 in. 57-58 All BBK mass air metersProform Harmonic Balancer Cover 66517CC 6. 75 in. Chrome Clamshell Package Patented Cover Offers Improved Readability More Stable Top Dead Center Indication Better Timing Accuracy Applications include: Bel Air, Biscayne, Blazer, Blazer K5, Brookwood, C10 Pickup, C10 Suburban, C15 Pickup, C15 Suburban, C15 C1500 Pickup, C15 C1500 Suburban, C1500 Pickup, C1500 Suburban, C20 Pickup, C20 Suburban, C25 Pickup, C25 Suburban, C25 C2500 Pickup, C25 C2500