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Charts & Guides for Part Number SUM-1251
Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts
PRO BBC H.R. 1 Hydraulic Roller Cam, 4/7 Swap, 204/214 Duration @ .050, 110 LSA + 4 Adv. , .510/.510 with 1.7 ratio, .540/.540 with 1.8, Idle-5600
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Estimated Ship Date: Tomorrow
Overview
Brand:
Manufacturer's Part Number:
SUM-1251
Part Type:
Product Line:
Summit Racing Part Number:
SUM-1251
Item Number:
7548070
UPC:
190861302099
Cam Style:
Hydraulic roller, Retro-fit
Camshaft Use:
Street/Towing
Camshaft Manufacturers Description:
BBC H.R. 1 works with mild gears and converter and has a slight idle with 396 cid. on up. Great for towing and daily 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:
Idle-5,600
Intake Duration at 050 inch Lift:
204
Exhaust Duration at 050 inch Lift:
214
Duration at 050 inch Lift:
204 int./214 exh.
Advertised Intake Duration:
257
Advertised Exhaust Duration:
267
Advertised Duration:
257 int./267 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.510 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.510 in.
Valve Lift with Factory Rocker Arm Ratio:
0.510 int./0.510 exh.
Lobe Separation (degrees):
110
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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Some parts are not legal for use in California or other states with similar laws / regulations
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