Summit Racing™ Pro BBC H.O. LS Firing Order Hydraulic Roller Cams SUM-1261-H-O-SN

Name: Summit Racing™ Pro BBC H.O. LS Firing Order Hydraulic Roller Cams
Brand: Summit Racing
SKU: SUM-1261-H-O-SN
Price: 429.99 USD
Availability: InStock
Rating: 0 (0 reviews)

Write the First Review

Part Number: SUM-1261-H-O-SN

$429.99

Summit Racing™ Pro BBC H.O. LS Firing Order Hydraulic Roller Cams

PRO BBC H.R. 11 H.O. Cam, Roller-Block , LS Firing Order, 270/276 @ .050, 108 LSA + 1 Adv., .700/.700 1.7 ratio, .741/.741 1.8 4300-7400
See More Specifications | Check the Fit

Summit Racing™ Pro BBC H.O. LS Firing Order Hydraulic Roller Cams SUM-1261-H-O-SN

SUM-1261-H-O-SN

Not Yet Reviewed

Part Number: SUM-1261-H-O-SN

Estimated Ship Date: Today

$429.99

Overview

Applications

Recommended Parts

Q&A

Instructions & Calculators

Estimated Ship Date: Today Would you rather pick it up?

Overview

Brand:

Summit Racing

Manufacturer's Part Number:

SUM-1261-H-O-SN

Part Type:

Camshafts

Product Line:

Summit Racing™ Pro BBC H.O. LS Firing Order Hydraulic Roller Cams

Summit Racing Part Number:

SUM-1261-H-O-SN

UPC:

190861385634

Cam Style:

Hydraulic roller, OE roller

Camshaft Use:

Street/Strip/Racing

Camshaft Manufacturers Description:

Big Block PRO BBC H.R. 11 H.O. Cam, Roller Blocks, LS Firing Order. H.O. stands for high overlap, so absolutely free-flowing exhaust is required to maximize the gains. Size for size, idle vacuum drops-but if winning is the goal, Pro BBC H.O.'s are the cam for you! RSC-PAC-1255X-16 Beehive Springs or Summit equivalents installed .050 out of coil bind are a great match for big RPM and reduced wear and tear on the valvetrain.

Basic Operating RPM Range:

4,300-7,200

Intake Duration at 050 inch Lift:

270

Exhaust Duration at 050 inch Lift:

276

Duration at 050 inch Lift:

270 int./276 exh.

Advertised Intake Duration:

338

Advertised Exhaust Duration:

344

Advertised Duration:

338 int./344 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:

0.700 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:

0.700 in.

Valve Lift with Factory Rocker Arm Ratio:

0.700 int./0.700 exh.

Lobe Separation (degrees):

108

Camshaft Gear Attachment:

3-bolt

Remanufactured:

Computer-Controlled Compatible:

Valve Springs Required:

Yes

Quantity:

Sold individually.

Notes:

Step-nose for roller blocks. Billet cams require a melonized or composite distributor gear and a bronze tip fuel pump push rod. LS firing order requires spark plug wire rerouting.

Summit Racing™ Pro BBC H.O. LS Firing Order Hydraulic Roller Cams

Summit Racing™ Pro BBC H.O. LS Firing Order hydraulic roller cams are American-made, billet steel camshafts for big block Chevys, designed with the 1-8-7-2-6-5-4-3 LS firing order. They reduce harmonics and improve bearing life while using Spintron-tested, high-RPM stable lobe designs. These cams require specific setup, including spark plug wire rerouting, a melonized/composite distributor gear, and a cam button.

Key features and benefits

* LS firing order: Changes the firing order to 1-8-7-2-6-5-4-3, which improves engine harmonics and reduces bearing stress
* Reduced detonation: Places the firing pair closer to the water pump for improved cooling
* Billet steel: High-strength, precision-ground on a Landis 3L for quality and durability
* High-RPM stability: Designed to work with modern beehive or small-diameter dual valve springs to minimize valvetrain wear
* Targeted performance: Ideal for street, strip, or towing, with lift profiles tailored for aftermarket or modified factory cylinder heads
* Important installation notes
-- Spark plug wires: Must be rerouted to follow the 1-8-7-2-6-5-4-3 sequence
-- Distributor gear: Requires a melonized or composite gear to protect the billet cam
-- Components: A cam button is required to control cam walk