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Holleys new GM Muscle Series accessories are the latest expansion to our officially licensed GM product line
They're available in different styles for use on a variety of vehicles from the 1950s and up
and all studs come complete with hardened parallel washers for an even load distribution and accurate torque readings
Choose the OEM replacement designed for your year/make/model application
Stainless Steel Perforated Internal Plate Eliminates Internal Rust
Proform Tall Model Valve Spring Height Micrometer # 67390 Cylinder Head Holleys new GM Muscle SeriesProform 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.
