Overview Reviews Product Description 508-18 Holley EFI Throttle Body Base Plate and Gasket Set Intake mounting gasket sealing kit for use with throttle body part number 112-578. Product Videos Custom Field Product Reviews Write a Review Write a Review × 508-18 Holley EFI Throttle Body Base Plate and Gasket Set Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *