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Briggs Model 40 Intek V-Twin Standard Piston Assembly
793647 Briggs 21/23 Vanguard V-Twin & Briggs 40ci Intek V-Twin STD Flat Top Piston
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Briggs Model 40 Intek V-Twin Standard Piston Assembly

Part Number: 793647
Online Price: $120.99
OEM Briggs Model 40 Intek V-Twin Standard Flat Top Piston Assembly
Availability: In Stock.

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Description

Briggs Model 40 Intek V-Twin Standard Flat Top Piston Assembly – OEM Upgrade


This is a Genuine OEM Briggs & Stratton Standard Bore Flat Top Piston Assembly, specifically designed for the Model 40 Intek V-Twin engine. Manufactured to exact factory tolerances, this piston delivers reliable performance and a clean drop-in fit for OEM rebuilds and mild performance upgrades.


But it doesn't stop there—this piston is also a proven compression upgrade for the Briggs Vanguard Model 38 (21–23 HP) V-Twin engines. The flat-top design raises compression slightly without requiring any head machining, making it a smart early-stage upgrade for golf carts, mud motors, and other recreational applications where torque and throttle response matter.


Included in the Assembly:

  • Flat Top Standard Bore Piston
  • OEM Piston Rings (Part #791787)
  • Wrist Pin sold separately – use Part #690229


OEM Part Numbers:

  • Current Part: 791787
  • Supersedes: 698429, 499588


Recommended Uses:

  • OEM rebuilds for Briggs Model 40 Intek V-Twin
  • Drop-in compression upgrade for Briggs Vanguard Model 38
  • Ideal for golf carts, mud motors, and other recreational small engine builds


Performance Benefits:

  • Flat top design slightly increases compression
  • Improves low-end torque and throttle response
  • No head machining required
  • Simple, cost-effective upgrade for mild performance builds


Ready to boost your engine’s bottom-end power without a full teardown? This OEM Briggs Model 40 Standard Flat Top Piston Assembly is a go-to first upgrade for backyard builders and weekend racers.

FAQ

1. What engine does this piston assembly fit?

This piston is a direct fit for the Briggs & Stratton Model 40 Intek V-Twin. It can also be used as a drop-in compression upgrade for the Model 38 Vanguard V-Twin (21–23 HP).


2. What are the benefits of a flat top piston in a Vanguard engine?

Using this piston in a Model 38 Vanguard slightly increases compression, resulting in better throttle response and low-end torque—ideal for golf carts and mud motors.


3. Do I need to machine the heads to use this in a Vanguard engine?

No. The flat top piston raises compression without the need to reduce combustion chamber volume through machining.


4. What parts are included in this piston assembly?

The assembly includes:

  • Flat top piston
  • OEM piston rings (#791787)
  • Wrist pin is sold separately – use Part #690229


5. Which OEM part numbers does this piston replace?

This piston assembly supersedes Briggs part numbers 698429 and 499588.

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