T&D Machine Rocker Shaft - .625 x 4.020 OAL Gas Cap Back Pressure Compensated AFR's when

Back Pressure Compensated AFR's when used with the optional Exhaust Pressure module

Holley TBI Pro-Jection

Adjusters / Aluminum Through Bolt Caps

A-Track or E-Track to D-Ring

T&D Machine Rocker Shaft - .625 x 4.020 OAL Gas Cap Back Pressure Compensated AFR's whenProduct Description: Rocker Arm Shaft 0. 625 in OD 4. 020 in Long Steel T&D Machine Sport Comp Rocker Arms Sold Individually T&D manufactures rocker arm systems for over 400 cylinder heads and its products have established a reputation for the highest levels of quality, performance and long term reliability. The company works closely with leading engine builders to maintain its position at the forefront of technology. Add to this the fact that unlike