Truck / SUV
Jeep®
Restoration
Stock Replacement
Late Model Muscle
Tools
Gifts, Clothing, & More
Circle Track
Street Rod
Powersports
Paint & Body
Marine
Jr Dragster
Instruction Sheets for Part Number SUM-1258-H-O
Summit Racing Equipment® Pro BBC LS Firing Order Hydraulic Roller Cams SUM-1258-H-O
Part Number: SUM-1258-H-O
Summit Racing Equipment® Pro BBC LS Firing Order Hydraulic Roller Cams
Big Block PRO BBC H.R. 8 H.O. Cam, LS Firing Order, 252/264 Duration @ .050, 108 LSA + 4 Adv., .624/.624 with 1.7 ratio, .661/.661 with 1.8, 4000-7000
See More Specifications
|
Check the Fit
Estimated Ship Date: Tomorrow Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
SUM-1258-H-O
Part Type:
Product Line:
Summit Racing Part Number:
SUM-1258-H-O
UPC:
190861381957
Cam Style:
Hydraulic roller, Retro-fit
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
Big Block PRO BBC H.R. 8 H.O. Cam, 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 coilbind are a great match for big rpm and reduced wear and tear on the valvetrain.
Basic Operating RPM Range:
4,000-6,900
Intake Duration at 050 inch Lift:
252
Exhaust Duration at 050 inch Lift:
264
Duration at 050 inch Lift:
252 int./264 exh.
Advertised Intake Duration:
304
Advertised Exhaust Duration:
313
Advertised Duration:
304 int./313 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):
108
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Rotation:
Clockwise
Quantity:
Sold individually.
Notes:
Billet cams require melonized or composite distributor gear and bronze-tipped fuel pump rod, cam button or Cloyes CLO-9-231 timing cover recommended, LS firing order requires spark plug wire rerouting.
Summit Racing Equipment® Pro BBC LS Firing Order Hydraulic Roller Cams
Summit Racing Equipment® Pro BBC Hydraulic Roller cams with LS Firing order are made in the USA with advanced cam lobe designs. LS Firing order increases bearing life through reduced harmonics and puts the firing pair closer to the water pump for increased resistance to detonation. Durations/LSA/Advance are valve event driven for consistent power and behavior. Lift is set for compatibility with most aftermarket heads or modified factory heads. Lobe intensities are aggressive without being hard on the valvetrain. They are Spintron-tested and designed for stability at high-RPM with modern Beehive and lightweight small-diameter dual-springs for less wear and tear on the system. Summit™ Pro Cams start with hardened bearing steel billets and are ground on a Landis 3L for unmatched lobe quality. These durable, billet-steel cams provide increased power and superior valvetrain stability, ideal for street, strip, or towing. Order the Pro BBC cam designed for your application.
Applications
Loading...
Loading...
Questions & Answers
Ask a Question
What type of question would you like to submit?
I have a Customer Service question
(order, shipping, returns, protection plans, etc.). Customer Service Question
(order, shipping, returns, protection plans, etc.). Customer Service Question
- OR -
I would like to ask other customers
a question about this Product. Product Related Question
a question about this Product. Product Related Question
Loading...
Reviews Write a Review
Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
Modal Header
Call To Order
This is a custom order part. You can order this part by Contacting Us.
Email this page
