Engine Kits & Rotating Assemblies
A rotating assembly bundles the crankshaft, connecting rods and pistons into one matched package for a rebuild or stroker engine. Kits are listed by engine family, stroke, bore and displacement. Check the cubic inch size, rear main seal style, balance type and whether your block and heads suit the chosen combination.
Showing 16 popular parts from 24 in this category. Search above or open the full catalog for the rest.
−15%PCE290.1124
Ford SB 289 302 Windsor 3.400" 347ci Forged Rotating Assembly Only
Available to order$1,677.20Was $1,964.70
−15%PCE290.1162
Chevy SBC 400 4.00" 427ci 2Pc RMS Forged Rotating Assembly Only
Available to order$1,636.70Was $1,925.50
−15%PCE290.1161
Chevy SBC 400 3.75" 400ci 2Pc RMS Forged Rotating Assembly Only
Available to order$1,636.70Was $1,925.50
−15%PCE290.1116
Chevy SBC 350 3.75" 383ci 1Pc RMS Forged Rotating Assembly Only
Available to order$1,730.60Was $2,036
−15%PCE290.1114
Chevy SBC 350 3.75" 383ci 2Pc RMS Forged Rotating Assembly Only
Available to order$1,636.70Was $1,925.50
−10%PCE290.1117
Chevy SBC 350 4.00" 427ci 2Pc RMS Forged Rotating Assembly Only
Available to order$1,656Was $1,840
PCE284.1019
Chevy LS 402ci 1000HP LME-built Complete Crate Engine with 6-71 Supercharger
Only 1 left$32,500
PCE284.1018.04
Ford 351W Windsor 427Ci Stroker Turn-Key Crate Engine with Downdraft EFI
Available to order$17,250
PCE284.1014.02
Chevy SBC 350 to 427 CID Forged Short Block Assembled Engine Motor 1000+ HP
Available to order$5,460
More in Engine
Performance and aftermarket parts
Performance parts, shipped today.
0 parts for Chevy, Ford, GM LS and Mopar builds, from gaskets to crate engines. Free shipping on orders over $150.
Today's deals Popular: Intake manifoldsCylinder headsIgnition kitsSuperchargers
Free shipping over $150Same-day dispatch before 3 pmTrack every order onlineMilitary & first-responder pricing
Today's deals
Special pricing, while stock lasts.
Shop by department
Everything between the bumpers.
Eight departments, with fitment notes on every part and a part number you can reorder by.
The store
On the shelf right now.
Best sellers, special pricing, clearance and outlet stock. Everything marked in stock ships today.
Full catalog
Browse every department.
0 parts across eight departments. Pick a category, filter by engine, sort by price, and open any part for a closer look.
Assembly · Complete systems
Matched on our bench. Ready to fit.
Crate engines, top end kits, supercharger kits and ignition systems assembled and checked before they ship, so every component arrives already working together.
More ways to save
Outlet, offers and discounts.
Outlet store
−40% up to
144 refurbished and clearance parts
Open-box returns and end-of-line stock, inspected and covered by the same warranty.
Shop the outlet Special pricing0parts reduced
Special pricing
Reduced prices across every department while stock lasts.
See the offers Military & emergency services10% every order
Thank-you pricing
Verified service members, police, fire and ambulance crews save on every order, on top of rewards points.
Verify onceMerchandise
Gear for the shop floor.
Motor Base apparel, drinkware, signage and gifts, in the same black, red and gold as the store.
Rewards
Every dollar builds your status.
One point per dollar, double and triple on selected parts, across seven tiers from Red to Black. Once you reach a tier it holds for a full year, and Gold and above get a dedicated account manager.
$3,400
3,400Points
$2,600To next tier
Yellow
Test drive game
Pick a car. Drive the city.
Take a supercharged muscle coupe, a big-block classic, a V8 pickup, a turbo rally sedan or our concept car for a spin around a 3D city. Every car has its own engine sound, gearing and grip, and you shift with a real clutch.
Optional and free. The game only loads when you press play. Open it full screen.
Complete automobiles, built to order
Tools & resources
Measure twice. Order once.
Install guides, catalogs and engine calculators. The calculators are pre-filled with a typical 350 small block.
Installation instructionsSearch a part number, or ask us to email its install guide.
CatalogsBrowse every department online, or ask for a printed copy.
CalculatorsCompression ratio and trap-speed horsepower, below.