Back when I did port work I would blast the port in the direction of flow with Black Magic abraisive , I really dont know if it helped or not, but after blasting the port flowed a little more.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
