---
title: What Parts Do I Need for a Discontinued BluePrint BP3830 Engine?
description: Learn which replacement parts, balance components, flywheel, and harmonic balancer are required for the discontinued BluePrint BP3830 383 stroker engine.
---

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# What Parts Do I Need for a Discontinued BluePrint BP3830 Engine?

 ***Is the BP3830 Internally or Externally Balanced?***

**The BP3830 was built as an externally balanced 383 Small Block Chevy combination.** The original BP3830 build specifications identify:

- 383 cubic inch displacement
- 3.750-inch stroke crankshaft
- External front balance
- External rear balance
- SCAT 400-style crankshaft with 350 mains
- Required balance weight package during assembly

 The build sheet specifically states:

> "Externally balanced front and rear."

 What Harmonic Balancer Does a BP3830 Require? **The BP3830 requires an externally balanced harmonic balancer.** When replacing the balancer:

- Verify external balance configuration
- Verify pulley bolt pattern
- Verify timing pointer location
- Verify overall diameter and accessory alignment

 Installing a neutral-balanced balancer on a BP3830 may result in immediate engine vibration. What Flexplate or Flywheel Does a BP3830 Require? **The BP3830 requires a weighted flexplate or weighted flywheel designed for an externally balanced Small Block Chevy 383 application.** Before ordering replacement parts, verify:

- Automatic or manual transmission
- Tooth count
- Starter compatibility
- Balance style

 Do not install:

- Neutral-balanced flywheels
- Neutral-balanced flexplates
- Components intended for internally balanced 350 applications

 How Can I Verify My Engine Is a BP3830? Look for:

- BP3830 identification on original paperwork
- BluePrint serial number tags
- 383 cubic inch displacement
- 3.750-inch stroke crankshaft
- Driver-side dipstick configuration
- Two-piece rear main seal configuration

 If the engine was purchased used, contact BluePrint Engines with the serial number if available. What Information From the Original Build Sheet Is Useful? Original BP3830 specifications include:

- Bore: **4.040"**
- Stroke: **3.750"**
- Rod Length: **5.700"**
- Flat-top pistons
- Four-bolt main block
- Two-piece rear seal
- Driver-side dipstick
- Minimum oil pressure: **40 PSI**

 What Problems Can the Wrong Balance Components Cause? Incorrect balance components may cause:

- Excessive vibration
- Rear main seal leaks
- Front seal leaks
- Bearing damage
- Crankshaft damage
- Accelerated flexplate wear
- Starter engagement issues

 If vibration begins immediately after component replacement, verify the flywheel, flexplate, and harmonic balancer are correct for an externally balanced 383 stroker. Frequently Asked Questions

### Is the BP3830 still in production?

**No.** The BP3830 has been discontinued. However, many engines remain in service and replacement parts are still available through normal aftermarket channels.

### Can I use a 350 flywheel on a BP3830?

**Only if it is the correct externally balanced version.** A standard neutral-balanced 350 flywheel is not acceptable.

### Can I use a neutral-balanced harmonic balancer?

**No.** The BP3830 requires an externally balanced balancer.

### My engine vibrates after replacing the transmission. What should I check?

 Verify:

- Flexplate or flywheel balance style
- Harmonic balancer balance style
- Converter fitment
- Crankshaft mounting hardware

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