Product Summary

1.5:1 Rocker Arm Ratio, 0.38" Stud Diameter

  • Long slot
  • Fits S/B Chevy using 3/8" studs
  • Balls and nuts not included
  • Set of 16
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Key Specs

MFG. Part #28711801
BrandSpeedway Motors
Rocker Arm Ratio1.5:1
See more specs

Need To Know

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Speedway Motors 28711801 Details

If you are looking to increase valve lift without swapping cams, a simple rocker arm upgrade can accomplish the task. By changing the ratio of your rocker arms, you increase total valve lift by multiplying the lobe height of the camshaft. More lift means more airflow and horsepower for a given valve size, assuming your cylinder heads can support it. This set of 1.5:1 long slot rocker arms are an excellent stock replacement if you are looking to replace a worn out set of rocker arms without making changes to valve lift.

These "long slot" rocker arms are the perfect upgrade for the budget-minded builder. Stock rockers can bind when used with high-lift cams. Here, the stud slot is machined with extra clearance for performance camshafts with up to .550" lift (when used with stock 1.250" diameter springs, 125 lbs max pressure). These stamped steel rocker arms work with 3/8" studs on 1955-85 style SBC heads (without self-aligning rockers). These stock appearing performance rocker arms are specially heat treated for maximum resistance to wear and flex.

  • High-ratio rocker arms are a great way to make your camshaft a little "bigger"
  • Long-slot rocker arms do not bottom out or bind up on the stud
  • Increase total valve lift 10% by changing your rocker arm ratio
  • Use with cams up to .550" lift and springs up to 125 lbs of pressure
  • Heat treated steel for maximum resistance to wear and flex
  • Stock appearing, with no moving parts to fall out or break
  • Fits 1955-85 style heads with 3/8" diameter studs

Making internal upgrades to your small block Chevy means getting the right combination of components for maximum performance and durability. When making a cam change, don't forget the other pieces necessary to a well-running SBC. Make sure you have the right combo, without breaking the bank, with a set of long slot rocker arms from Speedway Motors. Also, don't forget to check your valve guide clearance for the added lift!

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Speedway Motors 28711801 Specifications

KEY SPECS
MFG. Part #28711801
BrandSpeedway Motors
Rocker Arm Ratio1.5:1
GENERAL
Stud Diameter0.38"

Ratings & Reviews

4.8

4 Reviews

Overall Assessment

Customers stress the practicality of our product when upgrading or changing their cam, highlighting its essential role in engine rebuilds. The product’s usability is praised and comments emphasize reliable performance. The material quality is described as high standard, indicating durability. Many users would buy it again, demonstrating product satisfaction and a clear preference over competitors.

4.8

4 reviews

5

3

4

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Filter by Ratings

changing your cam change your rocker arms

5.0

6 years ago

woodsman

washington state

Verified

if you are upgrading/changing your cam, this product is a must.

Would Recommend

High quality

5.0

7 years ago

L s b

Chicago lill

Verified

Fast delivery

Would Recommend

I would buy this product again

4.0

9 years ago

Racer 33

California

Verified

Helps complete my engine rebuild

Would Recommend

I would buy this product again

5.0

10 years ago

Dan

Stacy MN

Verified

worked great

Would Recommend

Showing 4 of 4 reviews

Questions & Answers

5 Questions • 5 Answers

Will these work for a first generation 350?

by Todd

• 7 years ago

1 answer

can you use these rockers with a stock 350 sbc

by burt

• 7 years ago

1 answer

HOW MUCH LIFT CAN THESE ROCKERS HANDLE

by GEORGE

• 8 years ago

1 answer

are these rockers 3/8 or 7/16

by outlaw

• 10 years ago

1 answer

Are these rocker arms self aligning?

by Cletus64

• 12 years ago

1 answer

5 of 5 questions shown

Fitment

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  • Gen 2 LT1 Small Block Chevy

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  • Gen 1 L48 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 2 LT1 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

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  • Gen 1 L46 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

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  • Gen 1 L46 Small Block Chevy

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  • Gen 1 L48 Small Block Chevy

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  • Gen 1 L81 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

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  • 2-Piece Rear Main Chevy 350

  • Gen 2 LT1 Small Block Chevy

  • Gen 2 LT1 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

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  • Gen 1 L05 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

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  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

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  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

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  • 327 Chevy Small Block V8

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

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  • Gen 1 L05 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • 327 Chevy Small Block V8

  • 327 Chevy Small Block V8

  • 327 Chevy Small Block V8

  • 327 Chevy Small Block V8

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

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  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

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  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 327 Chevy Small Block V8

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L98 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

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  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 L05 Small Block Chevy

  • Vortec L31 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

  • Gen 1 L65 Small Block Chevy

  • Gen 1 L81 Small Block Chevy

  • Gen 1 L82 Small Block Chevy

  • Gen 1 L05 Small Block Chevy

  • Gen 1 L46 Small Block Chevy

  • Gen 1 L48 Small Block Chevy

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