Talk to a performance expert

615.446.6807

mon-thurs 9-5 cst

  1. Home
  2. Engines
  3. Briggs & Stratton Engines
  4. Briggs Model 38 Vanguard
  5. Head & Valve Train
  6. Hi-Rev Kit – Briggs Vanguard V-Twin (Models 35 & 38)
Hi-Rev Kit – Briggs Vanguard V-Twin (Models 35 & 38)
VG-15K Hi-Rev Kit for Briggs Vanguard V-Twin
Write a Review

Hi-Rev Kit – Briggs Vanguard V-Twin (Models 35 & 38)

Part Number: VG-15K
Online Price: $89.95
EC VG-15K High-RPM Upgrade Kit for Briggs Vanguard V-Twin (35 & 38)
Questions about this item? Ask here.
Availability: In Stock.

Send to:

*We'll ask for shipping info at checkout

Description

EC VG-15K Hi-Rev Kit – Briggs Vanguard V-Twin (Models 35 & 38)


The EC VG-15K Hi-Rev Kit is engineered to raise the RPM ceiling of your Briggs & Stratton Vanguard V-Twin Model 35 (18–20 HP) and Model 38 (21–23 HP) engines when the governor linkage has been modified for higher RPM operation. Ideal for mild performance builds, or enthusiasts looking to extract more power without a full engine teardown.


This kit helps stabilize the valvetrain at elevated RPM by increasing valve spring pressure using precision shims. It also includes an offset timing key for advanced ignition timing and OEM steel pushrods for improved strength over stock aluminum. Together, these components support up to 5,000 RPM safely when paired with a stock camshaft.


Kit Includes:

  • 1 Offset Timing Key (clockwise – for ignition timing advance)
  • 2 OEM Steel Pushrods (replaces weaker aluminum rods)
  • 4 Valve Spring Shims (increases spring seat pressure)
  • 4 Steel Retainers & Split Locks/Keepers


Fitment Notes:

  • Compatible only with Vanguard V-Twins using split lock valve retainers.
  • Not compatible with early engines using slip-on retainers unless upgraded valves are installed.
  • Designed for use with stock camshaft.
  • Not for Models 29 or 30 Vanguard, which use a smaller timing key.


Technical Notes:

  • Target safe RPM limit: 5,000 RPM
  • Works best as part of a staged upgrade plan; consider billet flywheel, rods, and carb tuning for full governor removal.
  • This kit does not bypass the governor system—it simply supports higher RPMs when adjusted properly.


Give your Vanguard V-Twin the power and valvetrain support it needs to rev higher, perform stronger, and stay reliable—without a full rebuild. The EC VG-15K is your first step toward dependable high-RPM performance.

FAQ

1. What engines does the VG-15K Hi-Rev Kit support?
It fits Briggs & Stratton Vanguard V-Twin Model 35 (18–20 HP) and Model 38 (21–23 HP) engines equipped with split lock valve retainers.


2. What’s included in the kit?
The kit contains:

  • 1 Offset timing key
  • 2 Steel pushrods
  • 4 Valve spring shims
  • 4 Retainers and split locks/keepers


3. Can I use this kit with a stock camshaft?
Yes. It’s designed specifically for use with the stock camshaft, supporting up to 5,000 RPM.


4. Does this kit remove the governor?
No. It supports higher RPM operation after governor adjustment, but full governor removal should only be done with additional upgrades like billet rods, a billet flywheel, and carb tuning.


5. Does it fit Vanguard Models 29 or 30?
No, this kit does not fit Models 29 or 30 due to the use of a smaller timing key in those engines.


6. Do I need to change my valves to use this kit?
Only if your engine uses slip-on valve retainers. This kit requires split lock/keeper-style valves and retainers.

Related Items

EC 1.5 Ratio Roller Rockers for Vanguard Briggs V-Twins
EC 1.5 Ratio Roller Rockers for Vanguard Briggs V-Twins
$399.99
Out of Stock.
EC 3/4-16 Billet PCV Valve
EC 3/4-16 Billet PCV Valve
$24.95
In Stock.
Add To Cart
EC Billet Aluminum Retainers fit 6mm Valve Stems using EC Beehive Valve Springs
EC Billet Aluminum Retainers fit 6mm Valve Stems using EC Beehive Valve Springs
$20.00
In Stock.
Add To Cart
EC Universal Billet PCV Valve
EC Universal Billet PCV Valve
$25.95
In Stock.
Add To Cart

Recently Viewed Items

Logo