Hickory Motor Speedway Rules Addendums 2020
Addendum to the street stock rules: 2/10/2020
1. All weights are MINIMUM with driver after qualifying and the race. When cars are weighed after the race, the only additional fluids that may be added to make weight will be enough water to top off the radiator, maximum of 2 quarts of motor oil in the engine and enough racing fuel to top off fuel cell at base of filler neck at bottom of vent hose. - as specified in HMS Race Procedures.
Hickory SS motor 3260 / 1467 (500 Holley)
MASS built motor 3260 / 1467 (350 Holley) No Vortec Heads
602 crate motor 3200 / 1440 (350 Holley)
602 crate motor 3260 / 1467 (500 Holley)
*These are the only engine combinations approved for Hickory Motor Speedway in Street Stock*
2. All cars must maintain a minimum of 45% right side weight at all times.
3. For competitor equality cars with front screw jacks will not be allowed to make jack bolt wedge adjustments during the actual race. * (1 lap penalty will be enforced)
4. All lead must be securely fastened and painted white with car number on it.
5. Claimed weight must be displayed on left rear corner of hood in minimum 1 ½” tall lettering.
1. Cylinder heads must be stock for make of engine.
2. Stock production steel heads only.
3. No vortec heads, or no angle plug heads on Hickory or Mass built motors .
4. Maximum valve size intake 1.94, exhaust 1.50
5. No necked down valve stems.
6. Maximum valve spring wire size .192 inch on Chevrolet engines and .200 inch on Ford engines.
7. No cutting of head for larger valve spring.
8. Poly locks permitted on rocker arm studs.
9. Screwed in rocker arm studs permitted.
10. No angle cut heads permitted.
11. All casting numbers must remain unaltered.
12. NO modifications, no porting or polishing. No grinding of any kind. 3 angle valve job ok as per Late Model Stock rule.
13. 72cc minimum.
1. Spacers will be per m itted to utilize the m axi m um allowable tread width. - One spacer per wheel, no welding, magnetized steel. Billet aluminum or magnetic Steel is approved. Spacers, if used, must be the same thickness left and right; however, the front and rear do not have to agree. Cars must not exceed the maximum allowable tread width of 67 inches, front and rear measured from the inside of one wheel to the outside of the other wheel, zero toe-in, at spindle height. A tolerance of ½ inch will be permitted between the front tread width and rear tread width, but the widest tread width must not exceed 67 inches. No welding allowed on any wheels
2. One maximum ¼” ‘extra wheel spacer' will be permitted on the right rear axle housing for tire sidewall clearance. With this extra spacer allowed, the right rear spacer(s) total thickness may be ¼” more than the left rear although the tread width still must not exceed 67 inches.