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Technical Articles for Part Number SUM-8709R1
Summit Racing™ Pro LS Automotive Camshafts
Stage 4 Pro LS Cam 238/246 113+3, .625/.605 Lift, Maximum power version, 3-bolt 5.3, 5.7, 6.0, 6.2, 7.0, LS1 LS2 LS6 LS3 LS7 LSA LQ4 LQ9 LS9 LY6 LY5
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Estimated Ship Date: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
SUM-8709R1
Part Type:
Product Line:
Summit Racing Part Number:
SUM-8709R1
UPC:
190861251465
Cam Style:
Hydraulic roller, OE roller
Camshaft Use:
Racing
Camshaft Manufacturers Description:
Not intended for use with VVT or AFM and flycutting the pistons may be required. Ultimate street/strip cam for a car or truck with the factory intake manifold design. Rowdy idle and will out horsepower any cam in it's range. State-of-the-art cam lobe designs to pull strongly past 7000 rpm with as little as 150 lbs. of seat pressure. Largest cam that fits LS3 with unmilled heads, but always check piston to valve clearance and degree if necessary.
Basic Operating RPM Range:
3,500-7,000
Intake Duration at 050 inch Lift:
238
Exhaust Duration at 050 inch Lift:
246
Duration at 050 inch Lift:
238 int./246 exh.
Advertised Intake Duration:
287
Advertised Exhaust Duration:
295
Advertised Duration:
287 int./295 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.625 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.605 in
Valve Lift with Factory Rocker Arm Ratio:
0.625 int./0.605 exh.
Lobe Separation (degrees):
113
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
Yes
Valve Springs Required:
Yes
Quantity:
Sold individually.
Notes:
Camshaft features base circle of 0.705 int./0.717 exh.
Summit Racing™ Pro LS Automotive Camshafts
Summit Racing™ Pro LS Automotive cams are affordable and designed in stages with very specific cam timing for each individual application in cathedral and rectangle port versions. This ensures maximum performance and gives you the idle you are looking for. The lobes are designed for stability at high rpm with the spring pressures found in quality .600 and .670 in. spring packs. Careful design guarantees the cams can be installed with minimal difficulty. Although piston to valve clearance should always be verified, the Stage 2 and 3 cams often allow for additional cylinder head milling. The Stage 4 cams often require no changes but can be degreed slightly different as needed. Starting with American bearing steel, they are precision machined on a Landis 3LB CNC grinder with CBN diamond wheels for unmatched quality.
Applications
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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