Holley Needle & Seat - Titanium Needle and Seat Assembly (.150" Seat) 4X-Large consistent wall thicknesses and improved

consistent wall thicknesses and improved casting quality

2-5/8 in Spindle Nuts

With forced-induction and the short runner length the engine rpm at which peak power occurs is more likely to be coupled to the supercharger or turbocharger being used

An integral LED eases timing calibration and diagnostics

Wideband Controller

Holley Needle & Seat - Titanium Needle and Seat Assembly (.150" Seat) 4X-Large consistent wall thicknesses and improvedWith a . 150" seat, this needle and seat assembly is about as big as you can get. What's really tricky, though, is that the needle is made of titanium! This needle design is very responsive to changes in flow rates and has excellent sealing capabilities. Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI