---
title: What Are the Basic Specifications of the Discontinued BP3550CTC1S Engine?
description: Learn the basic specifications of the discontinued BP3550CTC1S 355ci Small Block Chevy, including horsepower, torque, compression, heads, and camshaft.
---

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# What Are the Basic Specifications of the Discontinued BP3550CTC1S Engine?

### Engine Specifications

- **Engine Family:** Small Block Chevrolet (SBC)
- **Displacement:** **355 Cubic Inches**
- **Block:** Cast Iron
- **Main Caps:** **4-Bolt Main**
- **Rear Main Seal:** **One-Piece**
- **Compression Ratio:** **9.5:1**
- **Balance:** Internal Front / External Rear
- **Camshaft Type:** Hydraulic Flat Tappet
- **Camshaft Part Number:** Z103

 Cylinder Heads

- **Head Assembly:** HP4129
- **Head Type:** Vortec Iron Heads
- **Casting Numbers:** 
    - 10239906
    - 12558062

 Valvetrain

- Hydraulic flat tappet lifters
- Self-aligning rocker arms
- Pushrods: ELGPR537
- Valve adjustment: **Zero lash plus 3/4 turn**

 Fuel & Ignition

- **Carburetor:** Holley 3310S 750 CFM Vacuum Secondary
- Alternate Carburetor: Edelbrock 1407 750 CFM
- **Distributor:** RG59107 or MSD 8362 HEI Distributor
- Electronic ignition system

 Bottom End

- Reconditioned 350 crankshaft
- 4-bolt main block
- Performance connecting rods with upgraded rod hardware
- Dish pistons

 Performance Ratings

- **Minimum Dyno Horsepower:** 377 HP
- **Minimum Dyno Torque:** 397 lb-ft

 Oiling System

- High-volume oil pump
- Recommended operating oil pressure: 
    - **40-50 PSI**

 Key Features

- 355ci bored Small Block Chevy
- Vortec cylinder heads
- Hydraulic flat tappet cam
- 4-bolt main block
- One-piece rear main seal
- 9.5:1 compression ratio
- HEI ignition
- 750 CFM carburetor
- Street performance build designed for strong low and mid-range torque

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