Pontiac 400 455 Ram Air IV Hyd FT Cylinder Head Top End Engine Combo Kit [Black] The Speedmaster MidRise Air design

The Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise

non-stick PTFE inner core

resistance and turns ratios to deliver10-15% more energy than the OEM coils

The Speedmaster water pump pulley shim kits contain one 1mm spacer

That latter characteristic translates into increased ground

Pontiac 400 455 Ram Air IV Hyd FT Cylinder Head Top End Engine Combo Kit [Black] The Speedmaster MidRise Air designDon't spend hours figuring out which pieces and parts you need to get what you want from your engine. Speedmaster has already done the work for you; our Top End engine kits will save you the time and hassle of mixing and matching components yourself. These kits are specifically designed to deliver the performance you want, at a better price than purchasing the parts separately.