Reference Details
- Common issue
- Later Super Duty heads or common Pontiac heads may be substituted during racing or restoration.
- Confidence
- documented
- Correct value
- 540306 heads with 1.92-inch intake and 1.66-inch exhaust valves where the claimed early configuration calls for them
- Where to check
- Cylinder-head casting numbers, valve dimensions, dates, and supporting parts or installation records