Holley Needle and Seat

3/8” 32 tpi thread  O/All Length [closed needle inc] 1.47” [37.35mm]

orifice 0.110"

= OE 6-504 18BP-61A5 & 18BP-185A Holley (inc Performance Carburettors)
Single O-ring type 

Suits these Models:
2 BBL:
2300 350CFM Carb List No. 7448; List 4412 

4 BBL:  
4160 390 & 600CFM, Carb Nos. 6299, 1850, 6619, 4452
4510 725CFM,
4150 650, 600 725, 800CFM, Carb Nos. 4777, 4776, 4118, 4780, 7419
4150G, Carb No. 6822 

As fitted to:

Dodge V8 361 C.I. Commercial 1960-69
Ford Commercial V8 1959-69
Ford Commercial F100-F600, 361 C.I. V8 1966-70
Ford Commercial 391, 401, 477, 534 C.I. V8 1968-76
Ford Louisville LN700 & T900 1976 On 
International AB, ACCO,  345, 392 C.I. 1960-78