Standard

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 2 - High Lift - Fair idle, moderate performance, good mid range HP (2000 stall).
INT/EXH - Dur @ .050” Lift: 221°/230° RR: 1.5/1.5 Gross Lift: .525”/.544” LSA: 110° RPM: 2100 to 5800 Redline: 6300 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 2 - High Lift - Fair idle, moderate performance, good mid range HP (2000 stall).
INT/EXH - Dur @ .050” Lift: 221°/230° RR: 1.5/1.5 Gross Lift: .525”/.544” LSA: 110° RPM: 2100 to 5800 Redline: 6300 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 3 - High Lift - Noticeable idle, good mid-range, requires headers.
INT/EXH - Dur @ .050” Lift: 225°/232° RR: 1.5/1.5 Gross Lift: .535”/.550” LSA: 110° RPM: 2200 to 5850 Redline: 6350 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 3 - High Lift - Slight lope at idle, needs headers, 2500 stall recommended.
INT/EXH - Dur @ .050” Lift: 230°/236° RR: 1.5/1.5 Gross Lift: .544”/.555” LSA: 110° RPM: 2300 to 5900 Redline: 6400 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 3 - High Lift - Slight lope at idle, needs headers, 2500 stall recommended.
INT/EXH - Dur @ .050” Lift: 230°/236° RR: 1.5/1.5 Gross Lift: .544”/.555” LSA: 110° RPM: 2300 to 5900 Redline: 6400 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 3 - High Lift - Rough idle, aftermarket intake and headers a must.
INT/EXH - Dur @ .050” Lift: 232°/240° RR: 1.5/1.5 Gross Lift: .549”/.559” LSA: 110° RPM: 2400 to 5950 Redline: 6450 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 3 - High Lift - Rough idle, aftermarket intake and headers a must.
INT/EXH - Dur @ .050” Lift: 232°/240° RR: 1.5/1.5 Gross Lift: .549”/.559” LSA: 110° RPM: 2400 to 5950 Redline: 6450 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 4 - High Lift - Street/strip applications, rough idle, 2500 stall required.
INT/EXH - Dur @ .050” Lift: 236°/240° RR: 1.5/1.5 Gross Lift: .555”/.559” LSA: 110° RPM: 2400 to 6000 Redline: 6500 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 4 - High Lift - Street/strip applications, rough idle, 2500 stall required.
INT/EXH - Dur @ .050” Lift: 236°/240° RR: 1.5/1.5 Gross Lift: .555”/.559” LSA: 110° RPM: 2400 to 6000 Redline: 6500 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 1 - High Lift - Strong torque, excellent mileage and smooth idle.
INT/EXH - Dur @ .050” Lift: 196°/204° RR: 1.5/1.5 Gross Lift: .465”/.484” LSA: 110° RPM: 1600 to 5200 Redline: 5700 Learn More