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Charts & Guides for Part Number SUM-8745R1
Summit Racing™ Pro LS Automotive Camshafts SUM-8745R1
Part Number: SUM-8745R1
Summit Racing™ Pro LS Automotive Camshafts
Pro LS S.P.6 Cam, 256/270 Duration, 108 LSA + 4 Adv, .625/.625 lift, 3-Bolt, compatible with SUM-174005 springs. Gen. 3/4 5.3 5.7 6.0 6.2 7.0
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Overview
Brand:
Manufacturer's Part Number:
SUM-8745R1
Part Type:
Product Line:
Summit Racing Part Number:
SUM-8745R1
UPC:
190861363205
Cam Style:
Hydraulic roller, OE roller
Camshaft Use:
Circle Track/Drag Race
Camshaft Manufacturers Description:
Pro LS SP 6 is optimized for Single Plane use in Drag and Circle Track Applicatiions. Revised intake closing points and increased overlap will usually require flycut or aftermarket pistons. They are designed to work with the SUM-174005 .630 Beehive spring OR common dual spring packages. Extremely Mean Choppy idle. Headers and extremely free flowing mufflers required.
Basic Operating RPM Range:
5,000-7,800
Intake Duration at 050 inch Lift:
256
Exhaust Duration at 050 inch Lift:
270
Duration at 050 inch Lift:
256 int./270 exh.
Advertised Intake Duration:
306
Advertised Exhaust Duration:
322
Advertised Duration:
306 int./322 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.625 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.625 in.
Valve Lift with Factory Rocker Arm Ratio:
0.625 int./0.625 exh.
Lobe Separation (degrees):
108
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Rotation:
Clockwise
Quantity:
Sold individually.
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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