Overview Reviews Product Description 300-246 Holley EFI HI-RAM 105MM Plenum Top HI-RAM 105MM Plenum Top for EFI Hi-Ram Manifolds- Bolt down through design. Product Videos Custom Field Product Reviews Write a Review Write a Review × 300-246 Holley EFI HI-RAM 105MM Plenum Top Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *