Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts SUM-1258

Name: Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts
Brand: Summit Racing
SKU: SUM-1258
Price: 399.99 USD
Availability: InStock
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Part Number: SUM-1258

$399.99

Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts

PRO BBC H.R. 8 Hydraulic Roller Cam, 4/7 Swap, 252/258 Duration @ .050, 112.5 LSA + 8.5 Adv. , .620/.620 with 1.7 ratio, .656/.656 with 1.8, 3900-6800
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Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts SUM-1258

SUM-1258

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Part Number: SUM-1258

Estimated Ship Date: Today

$399.99

Overview

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Overview

Brand:

Summit Racing

Manufacturer's Part Number:

SUM-1258

Part Type:

Camshafts

Product Line:

Summit Racing™ Pro BBC 4-7 Swap Hydraulic Roller Camshafts

Summit Racing Part Number:

SUM-1258

Item Number:

7548076

UPC:

190861302167

Cam Style:

Hydraulic roller, Retro-fit

Camshaft Use:

Street/Strip

Camshaft Manufacturers Description:

BBC H.R. 8 likes 4.11+ gears and a 3,800+ stall converter. Mean lope with 454 Cid. + and the maximum for street/strip use. 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:

3,900-6,800

Intake Duration at 050 inch Lift:

252

Exhaust Duration at 050 inch Lift:

258

Duration at 050 inch Lift:

252 int./258 exh.

Advertised Intake Duration:

301

Advertised Exhaust Duration:

307

Advertised Duration:

301 int./307 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):

112.5

Camshaft Gear Attachment:

3-bolt

Remanufactured:

Computer-Controlled Compatible:

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