.3162" stem. 1.571" head.
2.6L / 159 OHV V6 12V "U" 90.00mm Bore 72-73
FORD
2.8L / 171 OHV V6 12V "S" 93.00mm Bore 83-86
FORD
2.8L / 171 OHV V6 12V "Z" 93.00mm Bore 74-79
FORD
FO159C | 2.6L / 159 OHV V6 12V "U" 90.00mm Bore 72-73
MERCURY
FO171C | 2.8L / 171 OHV V6 12V "Z" 93.00mm Bore 74-79
FORD,
MERCURY
FO171T | 2.8L / 171 OHV V6 12V "S" 93.00mm Bore 83-86
FORD