Rolls-Royce F-head Straight-Six (4.3-4.9L)

Inline-6, F-head (inlet-over-exhaust / IOE)4.3L (4,257 cc), 4.6L (4,566 cc), 4.9L (4,887 cc)Naturally aspirated1946-1959126-155 hp

Designed by Rolls-Royce (Crewe). Post-war IOE (overhead-inlet, side-exhaust) straight-six; grew 4.3 -> 4.6 -> 4.9L. The 4.9L Silver Cloud I was the last six-cylinder Cloud before the L410 V8. RR did not officially quote power.