KRE's New Aluminum Pontiac Head Exposed
You may have noticed in the chart in this story that the exhaust/intake flow ratios out of the box are quite high even with the 1.66 exhaust valve. KRE wanted the exhaust/intake flow ratio higher figuring that most buyers will want the intakes ported for more flow. So to save the customer money, there will be little or no need for porting on the exhaust side to get the theoretically optimal 80-percent exhaust/intake flow ratio, or the 70-75-percent ratio that many builders feel produces even more power. For example, if the heads are ported to flow 300 cfm at .500 lift on the intake, the resulting flow ratio with the untouched exhaust port at 226 cfm would be 75 percent. View Related Article
|
|