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Charts & Guides for Part Number SUM-1256
Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts
PRO BBC H.R. 6 Hydraulic Roller Cam, 4/7 Swap, 242/252 Duration @ .050, 113 LSA + 10 Adv. , .620/.620 with 1.7 ratio, .656/.656 with 1.8, 3700-6600
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Overview
Brand:
Manufacturer's Part Number:
SUM-1256
Part Type:
Product Line:
Summit Racing Part Number:
SUM-1256
UPC:
190861302143
Cam Style:
Hydraulic roller, Retro-fit
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
BBC H.R. 6 likes 3.73+ gears and 3,500+ stall converter. Serious lope with a 396 Cid. plus and about the biggest for weekend drivers. 4/7 Swap for added power. Works well with Beehive Spring like CCA-26055. Advance ground in for maximum power under the curve…recommended installation dot to dot and track tested before altering cam advance.
Basic Operating RPM Range:
3,700-6,600
Intake Duration at 050 inch Lift:
242
Exhaust Duration at 050 inch Lift:
252
Duration at 050 inch Lift:
242 int./252 exh.
Advertised Intake Duration:
294
Advertised Exhaust Duration:
301
Advertised Duration:
294 int./301 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.620 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.620 in.
Valve Lift with Factory Rocker Arm Ratio:
0.620 int./0.620 exh.
Lobe Separation (degrees):
113
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Quantity:
Sold individually.
Notes:
Summit Pro BBC billet hydraulic roller cams feature a 4/7 Firing Order, this requires re-routing the spark plug wires for 1-8-7-3-6-5-4-2. Cam Button required. Melonized or Composite distributor gear and billet compatible fuel pump pushrod required. Designed for Beehive or lighter 1.4-1.500 dual spirngs. Designed in 12 steps, Intake Closing point is most important to operating rpm. Bigger cams with increased overlap REQUIRE more open and free-flowing exhaust for maximum mid AND high rpm power. Cam advance is ground-in so install dot-to-dot. Although the advance may seem larger than normal, it's designed for maximum power under the curve. Track testing is recommended before altering cam advance.
Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts
Summit Racing™ Pro BBC 4-7 Swap hydraulic roller camshafts are offered in a dozen versions to cover street/towing, street/strip, and drag race applications. Each cam features a 4/7 firing order, requiring the re-routing of spark plug wires for 1-8-7-3-6-5-4-2. Cam button, a melonized or composite distributor gear, and billet compatible fuel pump pushrod are required. Choose your level of performance.
Additional features and notes:
* Designed for beehive or lighter 1.4 to 1.500 dual springs
* Designed in 12 steps, intake closing point is most important to operating rpm
* Bigger cams with increased overlap REQUIRE more open and free-flowing exhaust for maximum mid- and high-rpm power
* Cam advance is ground-in, so install dot-to-dot
* Although the advance may seem larger than normal, it's designed for maximum power under the curve
* Track testing is recommended before altering cam advance
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