Chevrolet › Chevelle › 1970

1970 Chevelle SS 454 restoration guide.
LS6 450 / LS5 360 / L34 350 + ZL2.

The 1970-only Chevelle SS 454 trio (LS6 450 hp at casting 3999289 / LS5 360 hp at 140163 / L34 350 hp reduced-output) seated on the 1970-onward A-body 112-inch-wheelbase unibody. The 1970-only ZL2 Cowl Induction hood carries the 1970-only vacuum-operated flapper solenoid + 1970-only washer-bottle relocation + the LS6-only cold-air plenum sealing flange pivot. LS6 at 140163 / 3999289 block + 781 closed-chamber heads + 3462363 cast-aluminum manifold + Holley list #4153.

Chevrolet guide
Build logs ↔ Chevrolet
Restore: Moderate

1970 Chevrolet Chevelle Restoration Guide — preview & buy

About this guide

1970 Chevrolet Chevelle SS 454 restoration reference — the 1970-only 450 hp LS6 (block casting 3999289, LS6-only aluminum Holley 4150 list #4153, cold-air cowl plenum with the RPO ZL2 cowl-induction hood) alongside the LS5 360 hp and L34 350 hp fitments in one model year. Covers the 1970-only heads 3964290 vs 3964291 discriminator, cowl-tag body styles 13637 (Sport Coupe) / 13667 (convertible), paint codes 75-75L Cranberry Red / 17-17L Cortez Silver / 25-25L Astro Blue / BA Black, RPO Z15 SS 454 equipment package vs RPO Z25 SS 396 carryover, the LS6-only forged-crank 4.250-inch stroke, the M22 "Rockcrusher" close-ratio four-speed, and the 12-bolt Positraction rear with 3.31 / 3.73 / 4.10 ratios.

Includes the GM A-body 112-inch marque-cross discriminator vs Buick GSX / Oldsmobile 442 W-30 / Pontiac GTO Ram Air IV, torque charts, LS6-specific fastener grades, and a Chevelle SS 454 cowl-tag authentication appendix. $29.

Preview & buy - Restoration Essentials

guide cover photo

Key restoration topics

11 topics covered in the full guide

  1. 01Pre-build survey, cowl-tag decode & body-mount locations
  2. 02Bodywork & rust repair
  3. 03Surface preparation
  4. 04Paint codes (LS6-correct colors)
  5. 05LS5 454, LS6 454, COPO 454 & LS-conversion outline
  6. 06Factory wiring harness layout (three looms + ZL2 solenoid)
  7. 07Assembly sequence (frame-first, body-off)
  8. 08Interior trim restoration (Strato-buckets, console, SS cluster)
  9. 09Fender tag & trim tag decode (SS-specific RPO block)
  10. 10Shakedown, brake bedding & alignment target
  11. 11Parts interchange (SS-only vs base Chevelle 350)

Free sample pages

Four PDF samples, no email required

Click any button below to download a one-page excerpt. Each shows a piece of the chapter content the full guide expands on.

Want a peek at the new design first? The rich-design sample uses the branded cover page - header band, numbered sections, dark-header tables, callouts, and total-page footers - so you can see the design bar before reading the full guide.

Checking the provenance ledger…
Checking for seller-submitted provenance…
More about this guide (FAQ, samples, related guides)

Universal cross-sell

Pair this guide with the Automotive Restoration Master Checklist

Marque-agnostic, 13-phase restoration reference — 250+ line items across Pre-Restoration Documentation, Disassembly, Frame & Chassis, Suspension / Brakes / Steering, Engine, Transmission & Driveline, Body Prep & Paint, Exterior Trim & Brightwork, Interior Restoration, Electrical System, Engine Bay Detailing, Final Assembly & System Verification, and Concours Prep & Judging. New in v2: every year / marque-specific task cross-references to its matching single-year guide, so the master checklist stays marque-agnostic while year-correct casting, part, and fastener detail stays one click away. One printable PDF, instant delivery.

Download Sample - $0Buy full guide + checklist - $19.95 →

FAQ

Questions before you buy

What does the PDF include?

1970 Chevrolet Chevelle SS 454 restoration reference — the 1970-only 450 hp LS6 (block casting 3999289, LS6-only aluminum Holley 4150 list #4153, cold-air cowl plenum with the RPO ZL2 cowl-induction hood) alongside the LS5 360 hp and L34 350 hp fitments in one model year. Cove... Free sample pages and the full guide in a single PDF, optimized for desktop reading and a tablet in the garage.

Can I download sample pages for free?

Yes. This page hosts free one-page sample PDFs taken from the chapter content the full guide expands on - click any sample button to download, no email required.

How much does the full guide cost?

The complete 1970 Chevrolet Chevelle Restoration Guide is a one-time $29.00 purchase. Payment is handled through Stripe; the download link arrives by email immediately after purchase. No subscription, no upsells.

What format is the guide in?

A single PDF, optimized for both desktop reading and a tablet in the garage. Pages are US-letter-sized, hyperlinked, and printable. The torque appendix is bookmarked so you can jump to a fastener reference in seconds.

Restoration Essentials newsletter — free.

New concours-grade guides, the model-line deep-dives that pair with them, and the day a guide in your focus area ships. One-click unsubscribe, no marketing.

We never share this address.

One-click unsubscribe in every email. We send restoration guides, not marketing.

Related guides

More Chevrolet guides

Spec & history — the 1970 Chevelle SS 454

The 1970-only LS6 450 hp + 1970-only ZL2 Cowl Induction.

The 1970 Chevrolet Chevelle SS 454 carries the 1970-only assembly-line Mark IV 454 cubic-inch V8 trio on the 1970-onward A-body 112-inch-wheelbase chassis. The 1970 LS6 454 at 450 hp / 500 lb-ft torque is the 1970-only top-output Mark IV 454 fitment on the 1970-onward A-body Chevelle SS — the 1971-onward LS5 carryover is reduced-output emissions-era, NOT the 1970 LS6. The 1970 LS6 block casting is 3999289 (1970-only Mark IV 454 block), shared-pattern with the 1970 LS5 140163 (the LS5 / LS6 were both finished on the 1970-only Mark IV 454 casting pattern).

The 1970 LS6 cylinder heads are 781 closed-chamber cast-iron with 2.19-inch intake valves / 1.72-inch exhaust valves — the LS6-only rectangular-port closed-chamber pattern. The 1970 LS6 cast-aluminum intake manifold 3462363 is paired with the 1970-only single Holley 4150 list #4153 780 cfm 4-barrel cold-air carburetor. The 1970 LS6 cold-air plenum sealed against the 1970-only ZL2 Cowl Induction hood hardware: the 1970-only vacuum flapper solenoid on the radiator support, the 1970-only washer-bottle relocation forward, and the 1970-only sealing-flange pivot hardware.

The 1970 LS5 454 at 360 hp shares the LS6 block casting 140163 / 3999289 (the 1970-only Mark IV 454 chain), but pairs the 1970 LS5 cast-iron 487 open-chamber heads with 10.25:1 compression and the 1970 LS5 cast-iron 3993915 manifold + 1970 LS5 Quadrajet. The 1970 L34 454 at 350 hp is the 1970 LS5 chain with reduced-output calibration (the 1970 L34-only quieter-lifter Q-jet). The 1970 ZL2 Cowl Induction hood was 1970-only with the Cowl Ventilation delete at the 1973-onward model year.

Concourse deep-dive — the 1970 Chevelle SS 454

Judging rubric, factory-correct finish, casting walk + paint codes.

A 1970 Chevelle SS 454 is judged on the 1970-onward Fisher Body cowl tag with body style 13637 (SS coupe) / 13667 (SS convertible), the 1970-only LS-code RPO line item (LS5 / LS6 / L34), and the 1970-only ZL2 Cowl Induction hood stamping verification. The 1970-onward Fisher Body trim tag carries the 1970-only AN-code interior-trim code (760 / 761 / 763 / 765 / 766 / 767 / 769 / 770) — distinct from the 1970-onward M-code base Chevelle trim.

Factory-correct finish on the 1970 Chevelle SS 454 is single-stage acrylic lacquer. Cranberry Red 75-75L / Shadow Gray 17-17L / Mulsanne Blue 25-25L ship single-stage. The 1970-onward lacquer lay-down was run at the 1970-onward final assembly plant. The 1970-onward single-stage lacquer carries 2.2 to 2.6 mil dry film thickness on the horizontal hood / roof / decklid. A 1970 SS 454 restored in BC/CC reads as mis-restored at the paint-system level.

Engine casting walk: 1970 LS6 block 3999289 (or 140163 shared pattern); 1970 LS6 heads 781 closed-chamber; 1970 LS6 manifold 3462363 cast-aluminum; 1970 LS6 carb Holley 4150 list #4153; 1970 LS5 / L34 block 140163; 1970 LS5 heads 487 open-chamber; 1970 LS5 manifold 3993915 cast-iron; 1970 LS5 carb Rochester Quadrajet. Cross-check the LS-code RPO against the casting pattern at the engine level.

Adjacent Chevelle guides

Other Chevelle SS 454 / SS 396 guides on the A-body 112-inch track.

New — multi-guide project bundle

Bundle the four-guide frame-off playlist for a 1970 Chevelle SS.

Frame & sheetmetal, LS-style drivetrain, interior & trim, and numbers-matching provenance grouped under one 1970 Chevelle SS authentication chain.

Combined $89.95 · list $119.80 · save $29.85

Open the 1970 Chevelle SS frame-off bundle →

More from Chevrolet & Chevelle

Continue on the Chevrolet Chevelle track.

Browsing the broader Chevelle A-body family and the Chevrolet brand hub?

Open the Chevelle marque hubOpen the 1964–1973 Chevelle marque guide

Ready to buy the 1970 Chevelle SS 454 restoration guide?

Jump back to buy