[TGould]

The new Stock was established in 1972. Several years ago I went through the NHRA rule books and created a file of the major changes. These are the changes for 1972 - 1979. I won't swamp you with the multitude of changes since then. But, V/S is still 6 and 4 cyl only and W is 4 CYL only .A lot of those great old cars (Buick, Olds, Studebaker) were 22, 23, 24 and 25 lb V8s . So even if NHRA allowed them back in (and they won't for the reasons stated) they would not have a class. But it sure would be neat.

1972: 1963 or newer
Dual exhausts (open during competition)
Pistons (stock) .035 over permitted
Street tires

1973: 1963 or newer
Blueprinting permitted

1974: 1965 or newer
Headers permitted (must retain tailpipe/mufflers)

1975: 1965 or newer
Reground camshaft permitted (stock lift, dur,overlap)
Cool cans permitted
Open headers
Slicks

1976: 1960 or newer
Classes W and X 6 and 4 cyl entries only
Class Y 4 cyl only

1977: No major changes

1978: Electric fuel pump OK (must retain manual pump)
Weigh car with driver (170 lbs added to car weight)
Weight of car can be adjusted + or - 75 lbs to fit the class
Helmets required

1979 : No major chamges