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Charts & Guides for Part Number SUM-8729R1
Technical Articles for Part Number SUM-8729R1
Summit Racing™ Pro LS Automotive Camshafts SUM-8729R1
Part Number: SUM-8729R1
Summit Racing™ Pro LS Automotive Camshafts
Pro LS Big Gun 1 Hydraulic Roller Cam, Stage 4.5 , 240/247, 115.5 + 5.5, .625/.605 with 1.7, .662/.641 with 1.8, 3700-7100+ RPM, 6.2+, Each
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Estimated Ship Date: Today
Overview
Brand:
Manufacturer's Part Number:
SUM-8729R1
Part Type:
Product Line:
Summit Racing Part Number:
SUM-8729R1
UPC:
190861275041
Cam Style:
Hydraulic roller, OE roller
Camshaft Manufacturers Description:
The Summit Stage 4.5 is one step higher than the 8709R1. Flycutting or aftermarket pistons required. It will make slightly higher torque and power through the range. Works best with aftermarket intakes. 11:1 + compression recommended. Rougher Idle. Stable to high rpm with 160lb. seat and 450lb. open pressure. Works well with nitrous or supercharger. Deeper gears and a 3500 rpm converter are recommended. Free Flowing Exhaust recommended.
Basic Operating RPM Range:
3,700-7,100
Intake Duration at 050 inch Lift:
240
Exhaust Duration at 050 inch Lift:
247
Duration at 050 inch Lift:
240 int./247 exh.
Advertised Intake Duration:
289
Advertised Exhaust Duration:
297
Advertised Duration:
289 int./297 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):
115.5
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
Yes
Valve Springs Required:
Yes
Quantity:
Sold individually.
Notes:
Requires flycutting pistons.
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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Some parts are not legal for use in California or other states with similar laws / regulations
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