Moroso MOR63421 Chevy Filler Neck - Billet Alum.

Moroso MOR63421 Chevy Filler Neck - Billet Alum. is listed by Motorstate as a Water Necks - Thermostat Housings for catalog matching by brand, part number, and product name. Use this source-backed listing when comparing Moroso components in the Water Necks - Thermostat Housings category. The manufacturer part reference is 63421, while the Motorstate part number is MOR63421. Confirm the part number, brand, and product category against your vehicle or build requirements before ordering. No vehicle compatibility is stated here unless it is present in separate fitment data.