http://www.nhra.com/competition/amendmends.aspx
"STOCK
Section 8A
Engine: 1
Cylinder Heads
Page 104
Add to end of fourth sentence: Runner volumes may not exceed the current Super Stock cylinder head volumes as listed on
www.NHRA.com.
Regardless of the poured volume measurement, any modifications to intake or exhaust runners prohibited. Any evidence of modifications from the original castings will be grounds for disqualifications. Final decision at the discretion of the Technical Services Department.
Pistons
Page 106
Add to end of fourth sentence: or gas porting."