New "ULR" style IRON HEAD Set for all 1937 - 1948 UL & ULH motors (Also fits the one year only 1936 VL motor with 9 Head Bolts) Cast Iron HEADS are made using newest technology and machining HEADS incorporate KR-model look-a-like chamber for best performance of your old flathead Compression is around 6.5:1 if fitted to 74" motor, and 6.9:1 on 80" motors. Dynotesting shows power went up 18% and torque 13% over stock heads HEADS come machined for 14mm Spark Plugs
New "ULR" style IRON HEAD Set for all 1937 - 1948 UL & ULH motors (Also fits the one year only 1936 VL motor with 9 Head Bolts) Cast Iron HEADS are made using newest technology and machining HEADS incorporate KR-model look-a-like chamber for best performance of your old flathead Compression is around 6.5:1 if fitted to 74" motor, and 6.9:1 on 80" motors. Dynotesting shows power went up 18% and torque 13% over stock heads HEADS come machined for 14mm Spark Plugs
