Small block Chevy engines are still the most common swap and rebuild target, so parts availability is broad but fragmented across suppliers
Small block Chevrolet engines—primarily the 283, 327, 350, and 400 cubic inch variants built from 1957 onward—remain the easiest V8s to source parts for, but where you buy matters. The same part can cost 40 percent more at one retailer than another, and some suppliers stock only reproduction or aftermarket pieces while others focus on original equipment manufacturer (OEM) stock. Understanding the difference between new, rebuilt, remanufactured, and used parts, and knowing which suppliers specialize in which category, saves money and prevents buying the wrong thing.
The small block Chevy market splits into four main channels: national mail-order performance shops, local machine shops and rebuilders, online marketplaces, and salvage yards. Each has different inventory depth, pricing, and return policies. A performance shop like Summit Racing or Jegs stocks thousands of new and reproduction parts but may not carry obscure 1960s original components. A local machine shop can often source or rebuild a specific casting but takes longer and requires in-person contact. Online marketplaces like eBay and Facebook Marketplace offer used originals but no warranty. Salvage yards have one-off pieces at low cost but require you to pull them yourself or pay a fee.
Key Takeaways
- Small block Chevy parts fall into four categories—new reproduction, rebuilt/remanufactured, original used, and NOS (new old stock)—and each has different cost, availability, and reliability profiles.
- National mail-order shops like Summit Racing, Jegs, and Speedway Motors stock the widest selection of new and reproduction parts but typically do not carry rare original pieces.
- Local machine shops and engine rebuilders can source or rebuild specific components but usually require phone contact and longer lead times than online ordering.
- Salvage yards and online marketplaces offer the lowest prices on used originals but come with no warranty and require you to verify condition before purchase.
- Identifying your engine's year and casting number before shopping prevents buying incompatible parts and helps you find the right supplier for what you actually need.
The four types of small block Chevy parts and what they cost
New reproduction parts are manufactured to original specifications by companies like Edelbrock, Holley, and Chevrolet Performance. They fit correctly and carry a warranty, but cost more than used originals—a reproduction intake manifold runs $150 to $400 depending on the design, while a used original might be $40 to $80. Reproduction parts are ideal when you need reliability and do not care whether the part looks period-correct.
Rebuilt and remanufactured parts are used originals that have been disassembled, cleaned, and restored to working condition. A remanufactured cylinder head from a shop like Edelbrock or World Products comes with a warranty and costs $300 to $600, while a used original head might be $80 to $150 but has no may provide. Remanufactured parts split the difference: lower cost than new reproduction, higher reliability than untested used stock.
Original used parts are pulled from junked or parted-out engines and sold as-is. They are the cheapest option—often $20 to $100 per piece—but you cannot know their condition until you have them in hand. Salvage yards and online marketplaces are the main sources. Some used parts are perfectly sound; others are cracked, worn, or corroded. Budget for inspection and possible machine work.
NOS (new old stock) is original Chevrolet parts that were never installed, still in the box, and often decades old. NOS commands a premium—sometimes 2 to 3 times the price of used originals—because it is rare and may provide original. Collectors and restorers seek NOS for authenticity; performance builders rarely need it.
National mail-order shops and what they stock
Summit Racing, Jegs, Speedway Motors, and Holley all maintain warehouses of small block Chevy parts and ship within one to three business days. They stock new reproduction parts, some remanufactured items, and a limited selection of used originals. Prices are competitive because volume is high, and most offer free shipping above a minimum order. Their websites let you filter by year, engine size, and part type, which is faster than calling.
These shops are best for common parts—gaskets, bolts, belts, hoses, intake manifolds, carburetors, and valve covers. They are not the place to find a specific 1962 casting-number cylinder head or a rare original air cleaner. Their return policies typically allow 30 days for unopened merchandise and sometimes longer for defective parts, so you have recourse if something arrives wrong.
Pricing varies between shops for the same part, sometimes by 20 to 30 percent. Calling or emailing with a part number and asking for a quote takes five minutes and often reveals that one shop has stock while another is backordered. Many shops also run sales or offer discounts for bulk orders, so checking their websites before buying saves money.
Local machine shops and engine rebuilders
A machine shop or engine rebuilder in your area can often source specific parts you cannot find online, rebuild worn components, and offer information on what will work for your engine. They typically work by phone or email, take longer than mail-order (one to four weeks), and charge labor on top of parts cost. A shop might charge $50 to $150 per hour to bore a cylinder, hone a block, or rebuild a head.
Machine shops are essential when you need precision work—boring and honing a block, resurfacing a head, or balancing a crankshaft. They can also source hard-to-find castings through their own networks of other shops and salvage contacts. If you are rebuilding an engine from the ground up, a local shop can often handle the entire job or at least the machine work, which saves you from coordinating multiple suppliers.
Finding a reputable shop takes word-of-mouth or online reviews. Ask at local car clubs, Chevy forums, or performance shops for recommendations. A good shop will give you a written estimate before starting work and explain what they found when they disassemble your parts.
Salvage yards and online marketplaces for used originals
Salvage yards stock used parts pulled from wrecked or parted-out vehicles. You can often browse in person, inspect parts before buying, and negotiate price. Some yards will pull a part for you if they have the engine in stock; others require you to pull it yourself. Prices are typically 50 to 70 percent lower than mail-order reproduction parts, but there is no warranty and no return option once you leave the lot.
Online marketplaces like eBay, Facebook Marketplace, and Craigslist let you search for specific parts across a wide geographic area. You can see photos, read seller feedback, and sometimes negotiate price. Shipping costs add up for heavy parts like blocks and heads, so local pickup is often cheaper. Buyer protection varies—eBay offers some recourse if a part arrives damaged or misrepresented, but private sellers on Craigslist do not.
When buying used originals, inspect photos carefully, ask the seller about casting numbers and condition, and request additional photos if the listing is vague. For expensive parts like cylinder heads or blocks, consider paying for a pre-purchase inspection by a local machine shop before committing to a long-distance purchase.
How to identify your engine and find the right parts
Small block Chevy engines are identified by displacement (283, 327, 350, 400), year, and casting number. The casting number is stamped on the block, head, and intake manifold and tells you the exact part and production date. A casting number like "3970010" on a cylinder head means it was cast in 1970 for a specific process. Knowing this number prevents buying a part that looks right but is incompatible.
The engine block casting number is usually on the right (passenger) side of the block, below the cylinder head. Cylinder head casting numbers are on the back of the head. Intake manifold numbers are on the underside. Write these down before shopping, and include them in any search or inquiry. Many online parts catalogs let you enter the casting number and will show you compatible parts and alternatives.
If you do not have the casting numbers, the engine's year and displacement are a starting point, but they are not precise enough for expensive parts. A 350 block from 1970 is not identical to a 350 block from 1985, and using the wrong head gasket set or intake manifold can cause leaks or poor fit. Spend 30 minutes finding the casting numbers before you spend money on parts.
Comparing price and lead time across suppliers
| Supplier Type | Typical Price Range | Lead Time | Warranty | Best For |
|---|---|---|---|---|
| National mail-order (Summit, Jegs) | Mid to high | 1–3 days | 30 days, sometimes longer | Common parts, quick turnaround |
| Local machine shop | Mid to high (labor adds cost) | 1–4 weeks | Varies by shop | Precision work, rare sourcing |
| Salvage yard | Low | Same day or pickup | None | Budget builds, one-off pieces |
| Online marketplace (eBay, Facebook) | Low to mid | 3–7 days shipping | Varies by seller | Specific originals, local deals |
For a typical rebuild, you will likely use multiple suppliers. Order common gaskets and seals from a mail-order shop for speed and warranty. Source a used original cylinder head from a salvage yard or online marketplace and have a local machine shop inspect and rebuild it. Buy a remanufactured intake manifold from a performance shop if you want reliability without the cost of new reproduction. This mixed approach balances cost, lead time, and quality.
Before placing any large order, contact two or three suppliers with your part numbers and casting numbers to compare pricing and lead time. A 20 percent difference in price on a cylinder head or block is common, and waiting an extra week for a backorder can derail your timeline. Five minutes of comparison shopping often saves $100 to $300 on a full rebuild.
Frequently Asked Questions
What is the difference between a 350 and a 327 small block Chevy?
The 327 has a shorter stroke and smaller displacement (327 cubic inches) than the 350 (350 cubic inches). They share the same block casting in some years, but cylinder heads, intake manifolds, and crankshafts are different. Parts are not interchangeable without modification, so confirm which engine you have before ordering.
Can I use a 1970s cylinder head on a 1985 350 block?
Sometimes, but not always. Casting numbers determine compatibility more than year does. A 1970 head might bolt on a 1985 block, but the gasket surface, port size, or valve angle could be different, causing leaks or poor flow. Check the casting numbers against a compatibility chart or ask a machine shop before buying.
Is it worth buying a used block versus a new reproduction?
Used blocks are much cheaper—often $100 to $300 versus $800 to $1,500 for a new reproduction—but require inspection and possible machine work. If you are building a performance engine, a used block that needs boring, honing, and decking can cost $400 to $800 in machine work, bringing total cost close to new. For a basic rebuild, used is usually worth it.
Where do I find NOS small block Chevy parts?
eBay, specialty Chevy forums, and NOS dealers are the main sources. NOS is rare and expensive, so expect to pay 2 to 3 times the price of used originals. It is mainly for collectors and restorers who want authenticity; performance builders rarely need it.
What should I ask a salvage yard before buying a used head or block?
Ask the casting number, year the engine was pulled, whether it has been tested or run since removal, and whether there are visible cracks or damage. Request photos if you are buying by phone. Ask about their return policy—most salvage yards do not accept returns, so inspect carefully before leaving.