2006 parts pro master catalog high ... an overall stacking height above the carburetor lip of only 2-1/2 while 5 filters ... have a 4-1/2 overall height fits all holley carter ... rochester and edelbrock carburetors with 5-1/8 dia necks includes matching ... fuel starvation problems ideal for extreme conditions such as hard ... gold anodized aluminum big block chevy 273-440 chrysler and all fords except 351c 351m ... chrome plated steel big block chevy 273-440 chrysler and all fords except 351c 351m ... plated steel clear-view sight plugs for holley carbs allows you to check float ... hex head fuel bowl screws designed for holley 4150-4165 and 4500 model ... carburetors hex head rather than screwdriver head ... allows for easier removal of the fuel bowl four ... per pack screws are 2-1/2 long part no 65414 vacuum line cap kit ...