New ALUMINUM HEAD Set OEM Tall Fin style for all 1937 - 1948 UL & ULH motors (Also fits the one year only 1936 VL motor with 9 Head Bolts) Premium grade cast aluminum HEADS are made in Europe using newest technology and machining "ULR" RACE 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 (100cc Chambers) Dynotesting shows power went up 18% and torque 13% over stock heads HEADS will take 1/2" valve lift, and there is still material left for pop-up piston modifications HEADS come machined for 14mm Spark Plugs
New ALUMINUM HEAD Set OEM Tall Fin style for all 1937 - 1948 UL & ULH motors (Also fits the one year only 1936 VL motor with 9 Head Bolts) Premium grade cast aluminum HEADS are made in Europe using newest technology and machining "ULR" RACE 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 (100cc Chambers) Dynotesting shows power went up 18% and torque 13% over stock heads HEADS will take 1/2" valve lift, and there is still material left for pop-up piston modifications HEADS come machined for 14mm Spark Plugs
