Review Limited Prep Port Matching Rules
#33600 from Production Committee · Rule change · TB 23-01 (2023-01 Fastrack)
In Production Category Specifications, GCR section 9.1.5.E.2.e.5., change as follows:
"Cylinder head ports may be matched to the intake and exhaust manifolds to a depth of no more than 1 inch from the port
mating surface."