What is Head-Quarters USA?
Head-Quarters began in 1969 with Doug Coffey and a vision. Since then, the demand for Doug's special blend of high performance and dependibility has been overwhelming. Head-Quarters USA was established in order to better serve the needs of retail customers in the US. Nothing else has changed...same great products by the same great company. Welcome to Head-Quarters USA.Flow Charts
ALL OUR TESTS ARE PERFORMED ON A FLOW BENCH AT 10lbs TEST PRESSURE
|
INTAKE FLOW |
Head |
Valve |
.100 |
.200 |
.300 |
.400 |
.500 |
.600 |
Total |
|
Stock |
1.84 HD |
36 |
76 |
108 |
122 |
126 |
127 |
595 cfm |
|
HQPorted |
1.90 HQ |
37 |
79 |
115 |
137 |
137 |
142 |
647 cfm |
|
Stock SE |
1.90 HD |
33 |
67 |
96 |
119 |
136 |
146 |
597 cfm |
|
Ported SE |
1.90 HQ |
36 |
72 |
100 |
122 |
139 |
150 |
610 cfm |