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Technical Articles for Part Number SUM-8717R1
Summit Racing™ Pro LS Turbo Camshafts
Stage 4 Pro LS Turbo Cam. 238/234 117+5, .625/.600 Lift, 2 deg. Overlap, Maximum Power for larger 364+ CID. 6.0, 6.2, 7.0L, LS2 LS3 LS7 LQ4 LQ9
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Overview
Brand:
Manufacturer's Part Number:
SUM-8717R1
Part Type:
Product Line:
Summit Racing Part Number:
SUM-8717R1
UPC:
190861251540
Cam Style:
Hydraulic roller, OE roller
Camshaft Use:
Racing
Camshaft Manufacturers Description:
The Summit Stage 4 Turbo cam is designed for built engines and serious power levels. This reverse split design is ideal for a single turbo applications with T4 hot side and full length performance exhaust system. A 3500+ stall converter is recommended. 3-bolt camshaft, computer tuning required.
Basic Operating RPM Range:
3,500-7,200
Intake Duration at 050 inch Lift:
238
Exhaust Duration at 050 inch Lift:
234
Duration at 050 inch Lift:
238 int./234 exh.
Advertised Intake Duration:
287
Advertised Exhaust Duration:
286
Advertised Duration:
277 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.625 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.600 in.
Valve Lift with Factory Rocker Arm Ratio:
0.625 int./0.600 exh.
Lobe Separation (degrees):
117
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
Yes
Valve Springs Required:
Yes
Quantity:
Sold individually.
Notes:
Not for AFM or VVT equipped engines. Summit Pro LS cams are designed for engines swapped into pre-pollution controlled vehicles. They are not for use in registered emissions-controlled vehicles operated on public highways and roads. 3-bolt camshaft, computer tuning required. Camshaft features base circle of 0.705 int./0.720 exh.
Summit Racing™ Pro LS Turbo Camshafts
Summit Racing™ Pro LS Turbo cams are affordable and specifically designed to optimize cam timing with turbochargers. The lobes are stable up to 7,000-plus rpm with the exhaust lobes opening softly against high cylinder pressure for reduced stress on the valvetrain. Overlap has also been reduced in order to prevent reversion, which is typically seen with higher turbine inlet pressures. They come in distinct stages that give you the idle, spool, and power characteristics that match your engine and turbocharger. Starting with American bearing steel, they are precision machined on a Landis 3LB CNC grinder with CBN diamond wheels for unmatched quality. The lobes have been designed for stability at high rpm with the spring pressures found in commonly available quality spring packs.
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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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