The intake runners are 80 grit and the exhaust runners are smoothed to 280 grit and polished. Just in one cylinder head I have about 7 hours total into it. I will be doing a set for my Z which are 48p heads. Those heads will have way more time spent into the exhaust runners then these 40P heads.
First time ever porting cylinder heads for my friends 300zx - EVLTWINZ02:17:38 10/04/17