Overview Reviews Product Description 566-105 Holley EFI Dual Sync Distributor Service Cap (Gen 2) Dual Sync Distributor Service Cap, These components work with the 565-200 series Dual Sync Distributors. Product Videos Custom Field Product Reviews Write a Review Write a Review × 566-105 Holley EFI Dual Sync Distributor Service Cap (Gen 2) Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *