Pro-Street

Pontiac - 287, 301, 316, 341, 350, 370, 389, 400, 421 & 455
Performance level 3 - Pro-Street - High revving, super mid to top end power grind.
INT/EXH - Dur @ .050” Lift: 240°/248° RR: 1.5/1.5 Gross Lift: .477”/.501” LSA: 112° RPM: 2800 to 6000 Redline: 6500 Learn More

Pontiac - 287, 301, 316, 341, 350, 370, 389, 400, 421 & 455
Performance level 4 - Pro-Street - Super upper mid-range and top end power profile.
INT/EXH - Dur @ .050” Lift: 247°/252° RR: 1.5/1.5 Gross Lift: .505”/.517” LSA: 112° RPM: 3000 to 6500 Redline: 7000 Learn More