My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Speedmaster PCE276.1089 BBC 454 Cast Steel Crankshaft 4.250 Stroke 2-Piece Rear Main Seal

(Chevrolet Corvette 1970-74, Impala 1970-76, Malibu 1975, C1500 1990-93, Chevelle 1970-75, Blazer 1973-74, C10 Pickup 1973-74, Caprice 1970-76 + 100 more models)

Manufacturer

Picture for manufacturer Speedmaster

Part Number

PCE276.1089
6 reviews
Sale Price

$408.29

1 left at this price

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Speedmaster PCE276.1089 is a cast steel crankshaft designed for Chevy Big Block 454 engines. This crankshaft features a 4.250-inch stroke and is compatible with 2-piece rear main seal configurations, making it an ideal replacement for worn factory crankshafts or a cost-effective foundation for mild street performance builds.

Key Specifications:

  • Material: Cast steel construction for durability and reliability
  • Stroke: 4.250 inches (standard BBC 454 stroke)
  • Main Journal: BBC standard
  • Rod Journal: 2.200 inches
  • Rear Main Seal: 2-piece design
  • Balance: Externally balanced
  • Finish: Precision-ground and micro-polished to exacting tolerances

Features & Benefits:

  • Precision manufacturing ensures proper journal dimensions and concentricity
  • Micro-polished surface finish reduces friction and promotes oil film retention
  • Cast steel construction provides excellent strength for street applications
  • External balance configuration matches original BBC 454 specifications
  • Direct replacement for stock crankshafts in rebuilds and restorations

This crankshaft is engineered for street engines and mild performance applications where cost-effectiveness and reliability are priorities. The precision grinding process ensures proper clearances with connecting rod and main bearings, while the micro-polished finish helps extend bearing life and reduce wear.

Products specifications

Fits

Chevrolet Corvette 1970-74, Impala 1970-76, Malibu 1975, C1500 1990-93, Chevelle 1970-75, Blazer 1973-74, C10 Pickup 1973-74, Caprice 1970-76, C10 1975-80, El Camino 1970-75, Monte Carlo 1970-75, K2500 1991-2000, Nova 1970-71 + 95 more models

Main Journal Diameter (in)

2.749 in.

Lightened

No

Crankshaft Material

Cast steel

Engine Balance

External

Main Bearings Included

No

Rod Journal Diameter (in)

2.200 in.

Rod Bearings Included

No

Rear Main Seal Style

2-piece

Quantity

Sold individually.

Engine Stroke (in)

4.250 in.

Crankshaft Snout Style

Standard

.

Boatplicity.com offers a user-friendly site with a wide selection of boat parts at competitive prices. Shipping was prompt. Overall, a positive experience and I recommend it for boat needs

Very simple thanks

Great site

Great service

I had ordered some CM-19546-A2 (friction-modifier for posi-traction differentials with carbon-fiber clutches) from CJ Pony Parts, and it arrived broken and had all leaked out. I spent $25.42 for nothing, and they still have not responded to my complaint. I bought 2 bottles from THMotorsports in hopes that ONE would arrive undamaged. They arrived in a box, not a bubble mailer like CJ, and both bottles were intact and undamaged. If you're going to buy specialty automotive fluids online, THMotorsports is the better place to do so.

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy