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1970 Chevelle SS 454 numbers-matching provenance.
LS6 450 / LS5 360 / L34 350 on the 1970-only ZL2 Cowl Induction.

The 1970-only Chevelle SS 454 trio at the engine-component level. LS6 at 450 hp on the 1970-only 3999289 block + 781 closed-chamber heads + 3462363 cast-aluminum manifold + Holley 4150 list #4153 780-cfm cold-air carburetor + 0.520" solid-lifter 112 LSA camshaft. LS5 at 360 hp on the 140163 block + 487 open-chamber heads + 3993915 cast-iron manifold + Rochester Quadrajet + 0.430" hydraulic-lifter 114 LSA. L34 at 350 hp on the LS5 chassis with reduced-output Q-jet calibration.

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Chevrolet Chevelle SS 454 Restoration Guide - 1970 LS6 / LS5 / L34 454 trio — preview & buy

About this guide

Numbers-matching provenance reference for the 1970-only Chevelle SS 454 trio (LS6 at 450 hp / LS5 at 360 hp / L34 at 350 hp) on the 1970-onward A-body 112-inch-wheelbase Chevelle SS chassis -- LS6-only block casting 3999289 paired with the LS6-only aluminum Holley 4150 list #4153 780-cfm cold-air plenum, the LS6-only cylinder heads and LS6-only solid-lifter flat-tappet cam, the 1970-only ZL2 cowl-induction hood hardware (washer-bottle relocation, vacuum-line routing, sealing-flange pivot hardware distinct from the 1970 Camaro ZL2 / ZL1 cowl-induction in sealing-flange geometry), the Fisher Body trim tag AN / M code discriminator, the 1970 assembly-plant discriminator (Baltimore / Fremont / Kansas City / Framingham / Atlanta / Willow Run / Arlington / Van Nuys / Los Angeles), and the GM A-body Chevelle body stampings vs the 1970 Pontiac LeMans / 1970 Buick Skylark / 1970 Oldsmobile Cutlass body stampings at the cowl-tag car-line discriminator.

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Key restoration topics

11 topics covered in the full guide

  1. 011970 LS6 454 (450 hp) -- block casting 3999289 + closed-chamber 781 heads
  2. 021970 LS6 intake + Holley 4150 list #4153 cold-air plenum
  3. 031970 LS5 454 (360 hp) -- block 140163 + open-chamber 487 heads
  4. 041970 L34 454 (350 hp) -- 1970 LS5 base with reduced-output calibration
  5. 051970 ZL2 cowl-induction hood hardware
  6. 061970 Chevelle SS Fisher Body AN / M trim tag discriminator
  7. 071970 assembly record and ten-plant discriminator
  8. 081970 SS 454 engine block stamp, partial-VIN, and numbers-matching chain
  9. 091970 A-body cross-platform discriminator (Chevelle / GTO / Skylark / Cutlass)
  10. 101970 LS6 vs LS5 vs L34 verification chart and authentication matrix
  11. 111970 SS 454 Coupe vs Convertible + Concourse deep-dive

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FAQ

Questions before you buy

What does the PDF include?

Numbers-matching provenance reference for the 1970-only Chevelle SS 454 trio (LS6 at 450 hp / LS5 at 360 hp / L34 at 350 hp) on the 1970-onward A-body 112-inch-wheelbase Chevelle SS chassis -- LS6-only block casting 3999289 paired with the LS6-only aluminum Holley 4150 list #4... 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.

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The complete Chevrolet Chevelle SS 454 Restoration Guide - 1970 LS6 / LS5 / L34 454 trio 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.

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Spec & history — the 1970 SS 454 LS6 / LS5 / L34 trio

LS6-vs-LS5-vs-L34 verification at the engine-component level.

The 1970 LS6 454 at 450 hp / 500 lb-ft torque: 1970-only 3999289 Mark IV 454 block (the 1970-only LS6 chain block, paired with the 140163 LS5 chain on the same casting pattern with the heavier webbing pattern for the LS6 application); 1970-only 781 closed-chamber cast-iron cylinder heads with 2.19-inch intake valves / 1.72-inch exhaust valves; 1970-only 3462363 cast-aluminum rectangular-port intake manifold; 1970-only Holley 4150 list #4153 780-cfm 4-barrel cold-air carb (the LS6-only list number). The 1970 LS6 cold-air plenum seals against the 1970-only ZL2 Cowl Induction hood hardware.

The 1970 LS5 454 at 360 hp / 500 lb-ft torque: 1970-only 140163 Mark IV 454 block (the LS5/LS6 shared-pattern block); 1970-only 487 cast-iron open-chamber heads with 2.07-inch intake valves / 1.50-inch exhaust valves; 1970-only 3993915 cast-iron low-rise spread-bore intake manifold; 1970-only Rochester Quadrajet (NOT the LS6 Holley 4150). The 1970 LS5 hydraulic-lifter 0.430-inch / 114 LSA profile is the 1970-only LS5 chain camshaft. The 1970 LS5 10.25:1 compression is paired with 1970 LS5 flat-top pistons.

The 1970 L34 454 at 350 hp / 470 lb-ft torque: the 1970 LS5 chain (block 140163, heads 487, manifold 3993915) with the 1970 L34-only quieter-lifter Q-jet calibration. The 1970 L34 0.410-inch / 114 LSA hydraulic-lifter cam is the 1970 L34-only profile. The 1970 L34 10.0:1 compression is reduced from the 1970 LS5 10.25:1. A 1970 L34 chassis with the 1970 LS5 0.430-inch-lift camshaft reads as mis-cammed at the engine-component level.

Concourse deep-dive — the 1970 SS 454 trio

Judging rubric, factory-correct finish, ZL2 authentication, cowl tag AN / M code.

The marque-club scores a 1970 Chevelle SS 454 chassis on the 1970 LS6 / LS5 / L34 verification chain (block casting, heads, intake, carb, cam, crankshaft, pistons, balancer, ZL2 hardware), the 1970-only Cowl Induction ZL2 stamped hood verification, the 1970 9-plant assembly discriminator (Baltimore / Fremont / Kansas City / Framingham / Atlanta / Willow Run / Arlington / Van Nuys / Los Angeles), the 1970-onward Fisher Body trim tag AN / M code interior-trim discriminator (NOT the 1970-onward M-code base Chevelle), and the 1970-onward Trim Tag (AN-code SS interior trim + M-code base trim).

Factory-correct finish on the 1970 SS 454 trio is single-stage acrylic lacquer. The 1970-only Cranberry Red 75-75L / Shadow Gray 17-17L / Mulsanne Blue 25-25L ship single-stage; the 1970 metallic colors ship BC/CC. The 1970 SS 454 lacquer lay-down was run at the 1970-onward final assembly plant with 2.2 to 2.6 mil dry film thickness on the 1970 horizontal hood / roof / decklid.

1970-onward ZL2 Cowl Induction hardware authentication: the 1970-only stamped hood with the 1970-only stamped rib under the scoop cavity, the 1970-only vacuum flapper solenoid on the radiator support, the 1970-only washer-bottle relocation forward, the 1970-only sealing-flange pivot hardware that bolts the LS6 cold-air plenum to the ZL2 hood scoop. A 1970 ZL2 chassis without the 1970-only sealing-flange pivot hardware reads as mis-routed at the cold-air-routing level.

Adjacent Chevelle guides

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

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