Proform Tall Model Valve Spring Height Micrometer # 67390 Rate_12 but not as hard as

but not as hard as solid metal bushings

as well as delivering the most control and the most efficient way to deliver fuel to your engine

so you can be assured of continued accuracy at any rpm

Aluminum body mounts are too harsh for street use and tend to break

FORD CUSTOMLINE

Proform Tall Model Valve Spring Height Micrometer # 67390 Rate_12 but not as hard asProform Tall Model Valve Spring Height Micrometer # 67390 Micrometer Range (in): 1. 600 2. 100 Micrometer Increments: 0. 0050 in. Maximum Valve Spring Retainer Diameter (in): 1. 500 Micrometer Material: Aluminum Micrometer Finish: Black Quantity: Sold individually. Notes: For use with tall beehive valve springs only.