Cost Breakdown: Building a 150 Hp Datsun 510 on a $3,000 Budget

The Challenge: 150 HP on a $3,000 Budget

The Datsun 510 is a legend among vintage Japanese cars—light, rear-wheel drive, and with a suspension that rewards a skilled driver. But making 150 horsepower from its original 1.6- or 1.8-liter engine on a strict $3,000 budget requires careful planning and a willingness to get your hands greasy. By focusing on the most cost-effective modifications and accepting a few compromises, you can build a car that’s genuinely fast and fun without breaking the bank. In this guide, we’ll break down exactly where every dollar goes, where you can save, and what trade-offs are worth making.

We’ll assume you already own or can find a solid, running 1970–1973 Datsun 510 for around $1,000. That leaves $2,000 for everything else—engine, suspension, brakes, wheels, and the little bits that make it yours. Let’s dive into the cost breakdown, component by component.

Finding the Right Datsun 510 – Spend Wisely on the Shell

The biggest mistake any budget builder makes is buying a cheap car that’s riddled with rust or needs a full engine rebuild. For $3,000 total, you need a running, driving car that doesn’t require major structural or mechanical repairs before you even start modifying.

Target Price: $800 – $1,200

Look for a car with minimal rust in the rocker panels, floor pans, and strut towers. Surface rust is fine; holes are not.
A 510 with a tired but running L-series engine is ideal—something you can drive home and then modify in stages.
Automatic transmissions are cheap to buy but swap easily. A manual car will cost more but saves you the hassle of a transmission swap later.
Be patient. Check Ratsun.net classifieds, Craigslist, and Facebook Marketplace. A clean, solid 510 for under $1,000 is rare but possible if you act fast.

Key takeaway: Spend the extra $200 on a car that doesn’t need structural welding. That’s money better spent on go-fast parts.

Engine Modifications – Getting 150 HP from the L-Series

The stock L16 or L18 engine in a 510 makes around 95–110 horsepower. To reach 150, you’ll need better breathing, a more aggressive cam, and perhaps a higher compression ratio. The most cost-effective path uses a L20B block from a later 200SX or 720 pickup, which gives you 2.0 liters and stronger internals. But if you stick with the original block, here’s where to put your money.

Budget Engine Build: ~$800

Used DCOE Weber carburetor (or clone): $150 – A 32/36 progressive is fine; dual Webers are faster but cost more. A single side-draft Weber on a Cannon manifold works well for 140-150 HP.
Header and 2-inch exhaust: $250 – A 4-into-1 header from ZCar Depot or a used MSA unit. Pair it with a free-flowing muffler (you can find a used Magnaflow for $50).
Upgraded camshaft: $150 – Look for a used Schneider 270° or 280° grind. The stock cam can’t rev high enough to hit 150 HP.
High-volume oil pump and timing chain set: $100 – Reliability upgrade essential for sustained high rpm.
Electronic ignition: $50 – A GM HEI module or a used Pertronix kit eliminates points. More consistent spark, better power.
Gaskets, fluids, and gaskets: $100 – Head gasket, intake/exhaust gaskets, oil, coolant.

Optional but recommended (save up): a used L20B short block ($100–$200) gives you more displacement for free. Then use your L16 head (ported yourself with a die grinder) to keep compression manageable.

Note: Dyno tuning is expensive and not necessary if you dial in jetting on the street. Spend the $200 you’d waste on a dyno session on a wideband O2 sensor kit instead—way cheaper and more useful.

Suspension – Don’t Ignore It, but Be Smart

A 150 HP 510 will be dangerous if it can’t turn or stop. But you don’t need fully adjustable coilovers. A budget suspension that works well costs about $400, leaving you money for tires.

Budget Suspension Package

Used lowering springs (cut stock springs are actually okay for a budget build): $0 – Heat and cut carefully, or buy used Eibach springs for about $100. Stock springs are soft; cutting them lowers the car and stiffens it slightly.
Tokico HP (Illumina) or KYB GR-2 shocks: $200 (new). Used are cheaper; look on forums. These are gas-charged and firm up handling.
Front sway bar from a 280ZX (used): $50 – A direct bolt-on upgrade that transforms roll resistance. Pick one up at a junkyard.
Polyurethane bushings for tension rods and sway bar: $50 – The510Realm forums have guides on which poly bushings fit.

This setup gives you a car that stays flat in corners and rides surprisingly well. If you have extra cash, add a camber plate or adjustable tension rods later.

Brakes – Stop Safely on a Shoestring

Stock 510 brakes are drum rear and tiny front discs. They’re marginal at 100 HP; at 150 they’ll fade fast. Upgrade the front and make the rears work better for under $250.

Budget Brake Upgrades

280ZX front calipers and rotors (used): $100 – A classic swap. Requires minimal modification (elongate the caliper bracket holes slightly). Increases rotor diameter and pad area.
Hawk HP+ or Porterfield R4-S pads: $80 – Much better bite than stock organic pads. These are streetable but can handle track days.
Stainless steel brake lines: $40 (used or new from RockAuto). Eliminates spongy pedal feel.
Flush and bleed with Motul RBF600 (or ATE Typ200): $30 – High boiling point fluid prevents fade.

Skip rear disc conversions for now. They’re $500+. Instead, adjust the rear drums properly and run a good proportioning valve. That’s free. Your brakes will stop you once or twice hard; for a street car that’s plenty.

Wheels and Tires – The Most Important Contact Patch

You can have 200 HP, but if your tires are hard and old, you’ll spin forever. A good set of used wheels and sticky tires is $500-$600. Here’s how to spend it.

Used 15x7 alloy wheels from a Miata or Toyota: $200 (set of four). Check for 4x100 or 4x114.3 pattern (510 is 4x114.3). You may need centering rings or lug nuts. Enkei RPF1s are great but expensive; used Konig or Drag wheels work fine.
Used 205/50R15 summer tires like Hankook RS4 or Federal 595: $300 (set of four, used with 50% tread). Buy from Facebook groups or Tire Rack clearance. New tires would blow the budget.
Alignment: $50 (after you install everything).

Rule of thumb: Spend as much on tires as you can. They make the car feel faster than any engine mod.

Interior and Exterior – Minimal but Clean

With only $200-$300 left after the big items, keep the interior sparse but functional. A ratty paint job is fine; spend money on reliability and safety.

Interior/Essentials

Used bucket seats from an aftermarket or OEM sport seat: $100 (e.g., from an old BMW or Miata). Make your own brackets with steel from Home Depot.
3-inch 4-point harness (used): $30 – Much safer than a worn stock belt.
Steering wheel and hub (used Momo or Nardi): $80 – Improves driving position and feel.
Sound deadener on floor (cheap peel-and-seal from Lowe’s): $30 – Reduces noise.

Exterior Quick Fixes

Flat black spray paint or a $200 Maaco paint job (if you have extra cash): $200 – Or just leave the patina. A clean interior matters more.
Clear tail lights (or stock): $0 (keep them).

Priority: Don’t spend on paint. The money goes into the mechanicals. A scruffy exterior with a well-engineered powertrain is a badge of honor in the Datsun world.

Drivetrain and Other Costs – Don’t Forget the Little Stuff

Every project car has hidden costs. Set aside $150 for incidentals.

Transmission & Clutch

Your stock 4-speed (or 5-speed if lucky) should hold 150 HP if you’re not brutal. If you have an automatic, a used dogleg 5-speed from a 200SX can be found for $100-$150.
Clutch kit (used Exedy or Centerforce): $80 – A stronger pressure plate is worth it. Replace the throwout bearing and pilot bearing.

Cooling & Electrical

Used aluminum radiator from a Fox body Mustang (or a two-row brass): $60 – The stock radiator may not keep up. You can find these on Craigslist.
Electric fan and thermostat switch: $40 – Frees up a few horsepower and keeps temps steady.
Wiring kit for engine bay (fuses, connectors, wires): $30 – Because old Datsun wiring is brittle.

These small items add up fast. A smart builder buys used parts from forum members and junkyards. Junkyard Dog and local wreckers are your friends.

Realistic Budget Summary: $3,000 Total

Here’s how the numbers line up for a build that actually hits 150 HP and is safe to drive:

Component	Cost
Datsun 510 (solid, running)	$1,000
Engine mods (carb, cam, exhaust, ignition)	$800
Suspension (springs, shocks, sway bar)	$250
Brakes (280ZX swap, pads, lines, fluid)	$250
Wheels and tires (used)	$500
Interior/Exterior (seats, harness, wheel)	$200
Drivetrain & incidentals (clutch, radiator, fan)	$250
Total	$3,250

That’s slightly over, but you can trim $250 by doing your own header fabrication (save $100), running cut springs ($0), or skipping a steering wheel and using stock seats. Alternatively, find a 510 for $800 instead of $1,000. The point: 150 HP on $3,000 is real if you hunt for deals and do all labor yourself.

Lightweight Advantage – Why You Really Only Need 150 HP

A stock 510 weighs about 2,200 lbs. At 150 HP, that’s a power-to-weight ratio comparable to a modern Mazda MX-5 (Miata). It will accelerate hard, corner on rails, and brake confidently with the upgrades we listed. Many enthusiasts chase 200+ HP with turbo swaps, but that costs $5K+ and often ruins the car’s balance. Stay at 150 HP and you’ll have a reliable, fun, and cheap car that can embarrass much more expensive machinery on a twisty back road.

Final Thoughts – Building a 150 HP Datsun 510 on a Budget Is Possible

This project isn’t for the faint of heart—it requires patience, mechanical skill, and a willingness to scrounge for used parts. But the reward is a car that feels alive and personal. Every parts store run, every junkyard find, every late night in the garage adds to the story. With $3,000 and a solid plan, you can build a Datsun 510 that’s genuinely quick and reliable. Start with the engine and tires, then fix everything else as you go. The best part? You’ll have a car that turns heads not because it’s perfect, but because it’s built with heart and ingenuity.

Ready to start? Join the forums at Ratsun and The510Realm—those communities have saved budgets and sanity for decades.