Standard Base Circle

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Stock Lift Rule - 1⁄2 mile, high bank track, mid to top
INT/EXH - Dur @ .050” Lift: 242°/248° RR: 1.5/1.5 Gross Lift: .446”/.447” LSA: 106° RPM: 3000 to 6500 Redline: 6500 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Stock Lift Rule - Lighter car, 3⁄8 mile track, low end
INT/EXH - Dur @ .050” Lift: 228°/236° RR: 1.5/1.5 Gross Lift: .449”/.449” LSA: 106° RPM: 2500 to 6000 Redline: 6500 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Stock Lift Rule & Stock Vacuum Rule - 1⁄2 mile, high bank track, mid to top
INT/EXH - Dur @ .050” Lift: 242°/248° RR: 1.5/1.5 Gross Lift: .446”/.447” LSA: 114° RPM: 3000 to 6500 Redline: 6500 Learn More