from erson catalog ::
Excellent choice for slightly modified, daily drivers, i.e.: Dodge Darts or Plymouth Challengers with 8.75-9.5:1 compression in 318-340 CID engines. Should have aftermarket aluminum, dual plane style intake with up to 650 cfm 4-barrel carburetion and gasket-matched cylinder heads for best results. Largest camshaft with stock converter and mid-3 series gearing... basic rpm range 2,000 - 5000- E420721 284° IN 220° IN .472" IN 108° 0° .000" IN .... Hi Flow AH 284° EX 220° EX .472" EX .000" EX.