Allstar Performance Spark Plug Index Shims 14mm Small O.D. | ALL96506 1972-nissan-510-esi7304811 Measured Flow: 505 CFM @

Measured Flow: 505 CFM @ 7" H20

For Garrett G42

XXX-Large (ALL931077)

This listing is for the Blue X-Large

Allstar Performance Spark Plug Index Shims 14mm Small O.D. | ALL96506 1972-nissan-510-esi7304811 Measured Flow: 505 CFM @Allstar Performance's small OD spark plug index shims are stackable washers that rotate the spark plug's ground strap in 30 degree increments up to 360 degrees for improved piston dome clearance. This small outside diameter version is sized specifically for ALL PRO cylinder heads and uses 14mm flat seat plugs. Set of 24 shims: 12 silver 60 degree and 12 black 90 degree. Compatibility: Sized for ALL PRO cylinder heads; fits 14mm flat seat spark plugs.