NAICS 336310 Quarterly Industry Report
Motor Vehicle Gasoline Engine and Engine Parts Manufacturing
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 336310Sector: 33Updated: Q1 2026
About This Report
This Fair Market Value industry report for NAICS 336310 draws on verified data from the U.S. Census Bureau[5], Bureau of Labor Statistics[6], and the Small Business Administration[7]. Our research team compiles establishment counts, employment data, and SBA eligibility criteria specific to motor vehicle gasoline engine and engine parts manufacturing. Reports are updated quarterly to reflect new Census releases and regulatory changes.
Industry Snapshot
Key metrics for the motor vehicle gasoline engine and engine parts manufacturing industry.
Industry Definition & Overview
Motor Vehicle Gasoline Engine and Engine Parts Manufacturing (NAICS 336310) encompasses establishments primarily engaged in manufacturing and rebuilding motor vehicle gasoline engines and engine parts, whether or not for vehicular use. Products include complete gasoline and flex-fuel engine assemblies, engine blocks and cylinder heads, pistons, piston rings, valves and valve train components, fuel injection systems, intake and exhaust manifolds, and engine gasket sets. The U.S. Census Bureau[5] classifies this industry under motor vehicle parts manufacturing.
Roughly 648 active businesses employ an estimated 46,300 workers in this industry. Production divides between OEM engine assembly for new vehicles and aftermarket parts manufacturing for engine repair and performance applications. Major automakers operate dedicated engine plants producing powertrains for their own vehicle assembly operations, while independent manufacturers supply replacement engines, remanufactured long blocks, and aftermarket performance components through distributor and retail channels.
Engine block casting and machining represents the most capital-intensive production process, using high-pressure die casting or permanent mold casting of aluminum alloys followed by precision CNC machining of cylinder bores, crankshaft journals, and valve seats. Assembly operations mate machined castings with forged crankshafts, connecting rods, pistons, and cylinder head assemblies on dedicated engine dress lines. Fuel injection component production requires tight tolerances for injector nozzles and fuel rail assemblies to meet emissions calibration requirements. Direct injection gasoline technology and turbocharging have become standard across most new engine platforms, increasing component complexity. Engine remanufacturing operations disassemble, clean, inspect, and rebuild used engine cores to factory specifications for warranty-backed resale through dealer and distributor networks.
What's Included in This Industry
- Complete gasoline engine assembly for motor vehicles
- Engine block and cylinder head casting and machining
- Piston and piston ring manufacturing
- Fuel injection system and injector production
- Intake and exhaust manifold manufacturing
- Valve and valve train component production
- Engine gasket set manufacturing
- Crankshaft and camshaft production
- Engine remanufacturing and rebuilding operations
- Turbocharger and supercharger manufacturing
NAICS Classification Hierarchy
| Level | Description | Code |
|---|---|---|
| Subsector | Transportation Equipment Manufacturing | 336 |
| Industry Group | Motor Vehicle Parts Manufacturing | 3363 |
| NAICS Industry | Motor Vehicle Gasoline Engine and Engine Parts Manufacturing | 33631 |
| National Industry | Motor Vehicle Gasoline Engine and Engine Parts Manufacturing | 336310 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 336320 | Motor Vehicle Electrical and Electronic Equipment Manufacturing | Manufactures motor vehicle electrical and electronic equipment rather than the mechanical engine assemblies and combustion system components produced in this classification |
| 336350 | Motor Vehicle Transmission and Power Train Parts Manufacturing | Produces motor vehicle transmission and power train components that connect to engines rather than the engine blocks, fuel systems, and internal components manufactured here |
| 336390 | Other Motor Vehicle Parts Manufacturing | Manufactures other motor vehicle parts not specifically classified in engine, electrical, steering, brake, or transmission categories separate from the engine-specific parts produced here |
| 333618 | Other Engine Equipment Manufacturing | Produces other engine equipment including diesel engines for non-automotive applications classified separately from the gasoline vehicle engines manufactured in this industry |
| 336340 | Motor Vehicle Brake System Manufacturing | Manufactures motor vehicle brake systems rather than the engine assemblies and combustion system components produced in this gasoline engine manufacturing classification |
| 336110 | Automobile and Light Duty Motor Vehicle Manufacturing | Assembles complete automobiles using engine assemblies supplied by plants in this classification rather than manufacturing the engines and engine parts themselves |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | California | 11.9% | 81 |
| 2 | Michigan | 10.3% | 70 |
| 3 | Texas | 7.3% | 50 |
| 4 | Ohio | 5.6% | 38 |
| 5 | Indiana | 4.7% | 32 |
| 6 | Florida | 4.0% | 27 |
| 7 | North Carolina | 3.8% | 26 |
| 8 | Wisconsin | 3.8% | 26 |
| 9 | Tennessee | 3.7% | 25 |
| 10 | New York | 3.5% | 24 |
% Of Establishments
0%
12%
Source: County Business Patterns, U.S. Census Bureau[3]
SBA Lending Summary
32
Total SBA Loans
$18.4M
Total Loan Volume
$576K
Average Loan Size
10 yrs
Average Loan Term
9.63%
Average Interest Rate
0
Jobs Supported
Source: SBA 7(a) Program Data, U.S. Small Business Administration — FY 2025[4]
Key Insight: The SBA[7] sets the size standard for NAICS 336310 at 1,500 employees. Firms below this threshold qualify for small business set-aside contracts and SBA-backed lending programs. Federal procurement includes replacement engines for military vehicle fleets, remanufactured powertrains for government vehicles, and engine components for defense logistics inventory. The SBA's contracting programs[8] support manufacturers pursuing Defense Logistics Agency and GSA fleet engine replacement contracts. Eligible businesses can access SBA 7(a) loans[9] for working capital, equipment, and acquisition financing, while 504 loans[10] support major fixed-asset purchases including real estate and heavy machinery.
Top SBA Lenders
| # | Lender | Loans | Volume | Avg Loan |
|---|---|---|---|---|
| 1 | U.S. Bank, National Association | 8 | $9.5M | $1.2M |
| 2 | Cadence Bank | 8 | $4.0M | $500K |
| 3 | The Huntington National Bank | 8 | $2.8M | $350K |
| 4 | CDC Small Business Finance Corp. | 8 | $2.1M | $259K |
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 336310?
Manufacturers of gasoline engines and engine parts for motor vehicles classify here. Products include complete engine assemblies, blocks, heads, pistons, fuel injection systems, manifolds, turbochargers, and remanufactured engines per the Census Bureau[5] classification.
How is the motor vehicle engine manufacturing industry structured?
Roughly 648 businesses employ an estimated 46,300 workers per Census data[11]. Major automakers operate captive engine plants while independent manufacturers produce aftermarket replacement engines, remanufactured long blocks, and performance components for repair and enthusiast markets.
What is the SBA size standard for NAICS 336310?
The SBA[7] sets the threshold at 1,500 employees. Businesses with fewer than 1,500 average employees qualify as small for federal contracting preferences and SBA-backed financing programs including 7(a) and 504 loans.
What NAICS codes are related to engine and engine parts manufacturing?
Related codes include 336320 (Vehicle Electrical), 336350 (Transmissions), 336390 (Other Vehicle Parts), 333618 (Other Engines), 336340 (Brake Systems), and 336110 (Automobile Assembly). Each covers either other vehicle component categories or complete vehicle manufacturing distinct from engine production.
What industries purchase motor vehicle engines and parts?
Automobile assemblers, parts wholesalers, repair shops, die casting foundries, and transmission producers interact most directly. OEM engine plants supply captive vehicle assembly operations while the aftermarket channel moves replacement engines and parts through distributors to repair facilities nationwide.
What activities are included in NAICS 336310?
Activities include casting and machining engine blocks and cylinder heads, forging crankshafts and connecting rods, manufacturing pistons and piston rings, producing fuel injection systems and turbochargers, assembling complete engine units on dress lines, and remanufacturing used engine cores to original equipment specifications.
Can motor vehicle engine manufacturers qualify for SBA loans?
Yes, firms below 1,500 employees qualify for SBA lending programs[8] including 7(a) and 504 loans. CNC machining centers, engine assembly conveyors, dynamometer test cells, and die casting equipment represent capital investments suited to SBA 504 equipment financing.
Where are motor vehicle engine manufacturers concentrated?
Engine plants concentrate in the Midwest automotive corridor, particularly Michigan, Ohio, Indiana, and Kentucky near vehicle assembly plants they supply. Alabama, Tennessee, and West Virginia host engine facilities built by foreign-owned automakers. Aftermarket engine remanufacturers distribute more broadly, locating near population centers and auto parts distribution hubs to serve repair market demand.
Sources & References
Government datasets and editorial sources used in this report.
- [1]U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages bls.gov
- [2]U.S. Census Bureau, Economic Census census.gov
- [3]U.S. Census Bureau, County Business Patterns census.gov
- [4]U.S. Small Business Administration, SBA 7(a) Loan Program Data data.sba.gov
- [5]U.S. Census Bureau census.gov
- [6]Bureau of Labor Statistics bls.gov
- [7]Small Business Administration sba.gov
- [8]SBA's contracting programs sba.gov
- [9]SBA 7(a) loans sba.gov
- [10]504 loans sba.gov
- [11]Census data naicslist.com
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