Feature:1. Application: Ignition module is replacement for Mercruiser, Replacement for OMC 4cyl. V6 V8 engines with for Delco breakerless distributors.2. OE Number: 811637001, 811637T, 1851071, 3854003 are the reference part numbers. Please double check the part number of your item.3. Sturdy Metal Construction: Constructed of high hardness metal material, ignition unit is wear resistant, impact resistant, not easy to break.4. Original Standard: Ignition module unit is engineered to meet or exceed OEM specifications, dedicated to the special car model.5. Ideal Replacement: Professional manufacturing, high performance, strong reliability, perfect for your rebuild, repair, and maintenance needs.Specification:Item Type: Ignition ModuleMaterial: MetalOE: 811637001, 811637T, 18-5107-1, 3854003Fitment: Replacement for Mercruiser, Replacement for OMC 4-cyl. V6 V8 engines with for Delco breakerless distributors..Package List:1 xIgnition ModuleNote:1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!