.20 thousand on a feeler gauge
According to my Chilton's Auto Repair Manual : The 351 Cleveland engine has single points and the 351 CJ engine has dual points in 1973
www.motorcraft.com shows the spark plug gap for a 351 ( 5.8 L ) in a 1993 F-150 as .044 inch
The 1976 351 Ford engine spark plug gap is .034. Most spark plugs will come pre-gapped from the spark plug manufacturer.
The gap on the 351 Cleveland changes timing. Adjust the point gap until it is at 28-32 and begin timing then.
Optimum plug gap for Club Car gasoline engine is .28". Go no wider than .30".
That year engine does not have POINTS.
i have read at another site that it is around .044
( .044 inch ) according to fordparts.com
.035 spark .020 points
points gap 17
18
What engine and what year?