General Cylinder Head Flow Numbers discussion

[SSDiv6]

Originally Posted by Billy Nees

You guys might want to take a look at the "odd" little rule change that's in the 2020 to 2021 rule changes. It just might have been put in there for a reason.

Saw that...inconspicuously and discreetly placed...

SECTION 11A: STOCK CARS: 1, BLUEPRINTING (Page 2) (12/3/2020)
Permitted per NHRA Specifications available from NHRA Technical Services
Department headquarters. Stock factory OEM Components (unless otherwise
specified) must be retained and remain unaltered (i.e., cylinder heads,
connecting rods, pushrods, crankshaft, etc.).

Clear as mud especially when aftermarket cylinder heads are allowed.