Big Block Chevy AFR, Air Flow Research Aluminum with 1 piece intake stand First Version
This 3109A set is specifically designed for the Chevrolet big Block AFR Air Flow Research BBC head. This set has a 1 piece intake stand that spans the length of the head. the exhaust stands will then attach to the intake along with the head.
Over the years AFR has released three version’s of this head. this can be identified by marking’s on the face of the head where the accessories would bolt up.
The first version had no stamping what so ever, this would use a 3109A rocker set
The next version had an “S” stamped on the face, This would use a 3109F rocker set
The newest head’s have a “V2” stamped on the face, This would use a 3148 rocker set
T&D always recommends measuring for the amount of offset required for your combination
+ Cylinder Head Mfg / Part #: Head type (aftermarket vs OEM). Part #s are often stamped in front / rear of castings.
+ Valve Length: Measured as overall length or + overlenth from OEM dimensions
+ Spring Diameter: Diameter or Mfg part #.
+ Pushrod Diameter: Width measured in thousandths.
+ Lash Caps: If installed on tip of valve stem – yes or no.
+ Rocker Ratios: Intake & Exhaust
+ Head Porting Information: If yes, please include provider name / company to determine alteration of valve spacing.
+ Block Type / Brand: Mfg / Part # (aftermarket vs OEM).
+ Cam Location: Standard or raised on aftermarket blocks for crankshaft clearance.
+ Deck Height: Standard or raised of aftermarket blocks for large displacement applications
+ Cam Type: Hydraulic, Roller or Hydraulic Roller
+ Lobe or Valve Lift: Lobe if rocker ratio is unknown.
+ Lifter Offset: Standard or Offset (Intake and / or Exhaust)
+ Lifter Height: Standard or Tall
+ Spring Oil Hole:
+ Std or Lightweight:
+ Needle Bearing Tips:
+ Spare Rockers: Quantity needed.