Introduced in 1961, the FE/FT big block 390 cubic inch (6.4 L) V-8 produced 265 horsepower (197.6 kW) at 4100 rpm (two-barrel carburetor) and 320 horsepower ((238.6 kW) at 4100 rpm in the four-barrel carburetor version. With a bore of 4.05 inches (102.87 mm) and a stroke of 3.78 inches (or 96.01 mm), it was the standard power plant for many Ford trucks; likewise for many of Ford’s cars of the day.
Produced in the mid-1960’s, the 406 motor had a 4.13 inch bore (104.90 mm) and the same stroke as the previous 390 – 3.78 inches or 96.01 mm. Actual displacement was 405.1 cubic inches (or 6.6 liters), which Ford took liberty in rounding up to 406. The 406’s new bore called for a heavier engine block with thicker cylinder walls. Innovative for pioneering cross-bolting on the motor’s main bearing, a common manufacturing technique today, it was developed strictly for racing. The 406 was available for only two years and was replaced by the 427 big block V-8.
Ford used the 410 motor for just two model years, in 1966 and 1967 Mercury automobile. The engine had the 390’s bore (4.05 inches or 102.87 mm) but had 3.98 inches (101.09 mm) of stroke – the same as the concurrently produced 428 motor. This added stroke produced 410.0 cubic inches (6.7 liters) of displacement. Compression ratio was 10.5 to 1.