Join Date: Jan 2002
Location: Calgary, Canada
Hello Gary, Yes you are right the 1.94 casting 186 head is the same basic casting as the factory 2.02 head, but the factory 2.02 head has differnt machining in the bowls ( below the seat) and also the intake wall around the intake valve is machined with a bigger cutter to unshroud the intake valve. Actually this a good way to go as any good machine shop can easily machine the heads out to 2.02x1.60 valve size, PLUS the valves sit up in the chamber just like a new head would! As far as unshrouding the intake wall i have built lots of motors without doing this and they run just fine. It probably hurts airflow in the chamber slightly, i have never flowed a original head and a converted head to find the difference. Hope this helps. Mike.