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Before buying anything, know which pump your 350 needs: a short water pump (hub sits about 5-5/8″ from the mounting face) was standard on 1968-and-earlier small blocks, and a long water pump (about 7″ from the mounting face) came in on 1969-and-later engines and most crate/reman 350s. The two aren’t interchangeable — a short pump on a long-pump block (or vice versa) throws the pulley and belt alignment off. Every pick below is labeled short or long; check your current pump’s measurement (or your accessory bracket kit’s spec) before ordering.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | ACDelco Professional 252-582 (Long) | $60-$68 | Amazon · eBay |
| 2 | Airtex AW5062 | $40-$50 | Amazon · eBay |
| 3 | GMB Water Pump (Chevrolet 5.7L/350 fitment) | $63-$125 | Amazon · eBay |
| 4 | FlowKooler Hi-Flow Water Pump | $80-$180 | Amazon |
| 5 | Speedmaster High-Volume Aluminum Water Pump | $90-$130 | Amazon · eBay |
| 6 | Weiand Action+Plus Aluminum Water Pump (Long, Polished) | $220-$235 | Amazon |
| 7 | Edelbrock Victor Series Aluminum Water Pump | $370-$485 | Amazon |
| 8 | Meziere WP101 Electric Water Pump | $450-$620 | Amazon · eBay |
The picks, in detail
ACDelco Professional 252-582 (Long)
A GM-affiliated OE-replacement long-style pump, a common direct-fit choice for 1973-1989 350s that already run the long-pump timing cover.
- Long-style, ~7″ hub
- Includes gaskets and O-rings
- OE-style cast construction
- GM-affiliated OE-replacement quality
- Gasket kit included, no separate gasket purchase needed
- Stock flow rate, not a performance upgrade
Airtex AW5062
A straightforward OE-replacement mechanical pump, a common budget-friendly pick for a daily-driven or stock-rebuild 350.
- OE-replacement cast iron construction
- Standard-flow impeller
- Direct-fit gasket surface
- Lower price point than most performance-branded pumps
- Long-standing aftermarket cooling-parts brand
- No high-flow impeller for performance or towing applications
GMB Water Pump (Chevrolet 5.7L/350 fitment)
A mid-priced OE-style replacement pump line with multiple part numbers covering both short and long 350 fitments — confirm the exact part number matches your pump style.
- OE-style cast construction
- Multiple SKUs covering short/long variants
- Standard-flow impeller
- Competitively priced against ACDelco and Airtex
- Covers both short and long applications across its lineup
- Must match the specific GMB part number to your pump style, not just the brand
FlowKooler Hi-Flow Water Pump
A high-flow mechanical pump with a larger impeller than stock, aimed at street or mild-performance 350s that run hot at idle or in traffic.
- Larger, higher-flow impeller than OE
- Cast iron construction
- Multiple short/long fitments by year
- Genuine flow increase over a stock-style pump, useful for engines that idle hot
- Same cast-iron durability as an OE-style pump
- Costs more than a basic OE-replacement for street driving that doesn’t need the extra flow
Speedmaster High-Volume Aluminum Water Pump
An aluminum-bodied high-volume pump available in both short and long styles with polished, satin, or black finishes for engine bay appearance.
- Aluminum casting, ~40% more flow than stock claim
- Short and long styles available
- Multiple finish options
- Lighter than a cast-iron pump
- Finish options for a dressed-up engine bay
- Aluminum pumps are more prone to internal corrosion than iron if coolant isn’t maintained
Weiand Action+Plus Aluminum Water Pump (Long, Polished)
A performance aluminum pump from a well-known hot-rod parts brand, positioned as a step up in flow and finish from a basic replacement pump.
- Long-style, polished aluminum
- Action+Plus high-flow impeller design
- Dress-up finish for show engines
- Recognized performance-parts brand with a long small-block-Chevy history
- Polished finish suits engine bay presentation builds
- Premium price versus a cast-iron OE-replacement doing the same cooling job
Edelbrock Victor Series Aluminum Water Pump
A performance-grade aluminum pump line sold in both short and long styles and multiple finishes, aimed at street-performance and mild-race small blocks.
- High-volume aluminum casting
- Short and long styles, polished or satin finish
- Competition-oriented impeller design
- Well-regarded performance brand with documented flow gains
- Style/finish options for engine bay builds
- The most expensive mechanical (non-electric) option on this list
Meziere WP101 Electric Water Pump
A belt-eliminating electric pump for engines that free up crank horsepower or need cooling independent of engine RPM — a different category from the mechanical pumps above, not a drop-in swap.
- Electric, ~35 GPM flow
- Eliminates the mechanical belt-driven pump entirely
- Requires separate wiring/controller
- Frees a small amount of parasitic horsepower versus a belt-driven pump
- Keeps circulating coolant with the engine off, useful after a hot shutdown
- Far more expensive and requires wiring work a mechanical pump swap doesn’t
Buying tips
- Measure your current pump (or the timing cover) before ordering: short pumps read about 5-5/8″ from the mounting face to the pulley hub, long pumps about 7″.
- There’s no cooling-performance difference between a short and long pump on their own — the choice is about matching your timing cover, accessory brackets, and fan clearance, not extra flow.
- If you’re adding a clutch fan, aftermarket brackets, or an A/C compressor, check the bracket kit’s required pump style before buying either the pump or the brackets.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.