Small Base Circle

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - High torque 1/4 and 3⁄8 mile oval track profile.
INT/EXH - Dur @ .050” Lift: 248°/250° RR: 1.5/1.5 Gross Lift: .614”/.620” LSA: 104° RPM: 2800 to 6800 Redline: 7200 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - Mid-range torque and top end oval track profile.
INT/EXH - Dur @ .050” Lift: 258°/262° RR: 1.5/1.5 Gross Lift: .626”/.626” LSA: 105° RPM: 3000 to 7500 Redline: 8000 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - High torque oval track grind.
INT/EXH - Dur @ .050” Lift: 256°/260° RR: 1.5/1.5 Gross Lift: .626”/.627” LSA: 105° RPM: 3000 to 7000 Redline: 7500 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - Excellent big cid engine profile. Perfect for 3⁄8 to 1⁄2 mile oval.
INT/EXH - Dur @ .050” Lift: 264°/268° RR: 1.5/1.5 Gross Lift: .626”/.626” LSA: 105° RPM: 4500 to 8000 Redline: 8000 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - Fast 3⁄8 and 1⁄2 mile oval track grind.
INT/EXH - Dur @ .050” Lift: 260°/268° RR: 1.5/1.5 Gross Lift: .626”/.624” LSA: 105° RPM: 4000 to 8000 Redline: 8000 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - Torque and mid-range power for drag and oval track racing.
INT/EXH - Dur @ .050” Lift: 270°/278° RR: 1.5/1.5 Gross Lift: .633”/.644” LSA: 103° RPM: Varies on valve train, heads, manifold, etc… to Redline: Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - Mid-range and top end drag profile for small motor. Excellent for big oval track motor.
INT/EXH - Dur @ .050” Lift: 268°/272° RR: 1.5/1.5 Gross Lift: .626”/.627” LSA: 105° RPM: 5200 to 8000 Redline: 8000 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - 1⁄2 mile or longer in big cid engine. Torque and mid-range for drag.
INT/EXH - Dur @ .050” Lift: 262°/272° RR: 1.5/1.5 Gross Lift: .639”/.629” LSA: 105° RPM: 5000 to 8000 Redline: 8000 Learn More

Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level 5 - Ultra-Action - Mid-range and top end drag race profile for 350 cid with automatic transmission.
INT/EXH - Dur @ .050” Lift: 282°/286° RR: 1.5/1.5 Gross Lift: .672”/.687” LSA: 108° RPM: Varies on valve train, heads, manifold, etc… to Redline: Learn More