That was probably 1975, when they introduced HEI.
recommended spark plug for a fd501v
An Autolite 258 is the recommended spark plug for a 6. 5 horsepower Tecumseh engine. A Champion RJ19LM also is recommended by the manufacturer.
In a 1997 Ford F-350 the 460 cubic inch / 7.5 liter V8 engine is a gasoline engine . It has ( 8 ) spark plugs and spark plug wires .The 7.3 liter V8 / 445 cubic inch is a diesel and has no spark plugs or spark plug wires
In a 1988 Ford E-150 : If you have the 4.9 liter / 300 cubic inch inline six cylinder engine , you need ( 6 spark plugs ) If you have the 5.0 liter / 302 cubic inch V8 engine or the 5.8 liter / 351 cubic inch V8 engine , you need ( 8 spark plugs )
The recommended spark plug, for a 1984. Thunderbird 302, V8 engine, is a champion spark plug. The spark plugs can be purchased at most auto-parts stores.
The recommended spark plug gap is .032"
The recommended spark plug gap is .044"
The 1989 Chevrolet 350 cubic inch engine spark plug gap is dependent upon the engine application. The most common spark plug gap for the Chevy 350 engine is .027.
The recommended spark plug gap for a 1994 Toyota 22RE is .032"
According to one of Fords websites : For a 1990 E-250 Econoline : ---------------------------------------------------------------------------------------------------- The 4.9 liter / 300 cubic inch inline six cylinder engine and the 5.8 liter / 351 cubic inch V8 engine have the spark plugs gapped at ( .044 inch ) ----------------------------------------------------------------------------------------------------- The 5.0 liter / 302 cubic inch V8 engine has the spark plugs gapped at ( .054 inch )
.040
The recommended spark plug gap on a 1996 Chevy C1500 with a V8-305 engine is .060"