7,900 Classic Super Stock
NEW for 2026 we will be following PPL fuel & water standards. Diesel fuel standards on the dielectric constant test are greater than 30 and less than 150. Pullers can use their OWN water in 2026. No oxygen carriers or combustion accelerators allowed in water injection. Only water-soluble oil permitted in water injection. Water injection maximum reading on efractoneter is 5.0 (updated 9/2025)
ENGINE
ALL ENGINES MUST BE 531 CUBIC INCHES OR SMALLER.
CYLINDER HEADS
Must be from the same manufacturer and must bolt in stock location without modification. No over-head cams allowed.
INJECTION PUMPS
P-7100 series pump maximum, one plunger per cylinder. No computerized fuel systems allowed.
MANIFOLDS
OEM stock intake and exhaust manifolds for that series engine, alteration for turbo mounting allowed. OEM style intake manifolds including intercooler type manifolds, intercoolers must be unhooked with no hoses attached to the cooler (no functioning intercoolers allowed). No intake spacers. May strengthen manifolds by welding gussets/braces.
TIRES
18.4x38 maximum radials allowed.
TURBOCHARGER
One single stage turbo allowed. Turbo must not extend through the hood.
A. Exhaust bolt pattern no larger than 2.750” x 3. 250”.
B. No altering of a housing to accommodate a smaller base, i.e., T-18A95 with a smaller base welded to it. No external altering of housings. Compressor housing must be 3LM style with 2” OD outlet.
C. A compressor measurement to be measured at the face of the wheel a maximum of 2.7”. The wheel may be no larger than this measurement at the inlet.
Compressor housing inlet bore to be no more than 2.75" maximum. Tips of the wheel must protrude into the opening at least 1/8”. No slots or grooves. A maximum of 2”. OD at the outlet.
D. An exhaust measurement to be measured at the face of the wheel outlet of a maximum of 3”. The wheel may be no larger than this measurement at the outlet.
Exhaust housing bore to be no more than 3.06" maximum.
WEIGHT: Maximum weight of 7,900 lbs.