At Atwood Performance, all pairs of heads leave with a flow test sheet. As can be seen in the picture,
flow testing is accomplished on a SuperFlow SF600 professional model flowbench. The cylinder heads are flowed
through an actual Harley Davidson cylinder to correctly simulate the way the head will flow when bolted to the engine. All
tests are performed at the industry standard of 28" water depression for accurate comparrisons with others. Intake is
tested with a 3/4" radius inlet. Exhaust tested with 1 3/4" X 6" head pipe.
Atwood Performance takes great pride in being extremely accurate with flow test results and encourages private testing
Typical Stage 1 flow