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- Raw iron front and rear head set is for 74" and 80" models
- This set is casted after the OE Cast Iron Heads, which features the squish "WR" combustion chamber
- Head set accepts 18mm spark plugs and iron head length head bolts
- Heads are machined for the brass primer cups
- Heads features WR shape combustion chambers
- Uses 1-3/8" large hex 18mm plugs
- Fits 1937-1948 UL models