Cylinder heads
#35040 from Pater Mumford · Rule change · TB 24-01 (2024-01 Fastrack)
In GCR, Section 9.1.2.D.1.e.3., add at the end of section add the follows:
"Trick Flow Specialties Ultra 18 Degree GM Cylinder Head assembly Part #TFS-3181T001-CO1 is allowed."