A 1970 Chevelle SS Got a Brand-New Frame and a Modern Crate V8 — Nothing Original Survived Except the Body

This Vanguard Motor Sales restomod wears real 1970 Chevelle SS sheet metal, but almost nothing underneath it rolled off a GM line. A modern LSX big block and an aftermarket chassis replace everything that made the original car original — and buyers are lining up anyway.

Call this car a 1970 Chevrolet Chevelle SS and most muscle car fans will picture a numbers-matching big block hiding under original sheet metal. This one is a different kind of car entirely. Vanguard Motor Sales took a Chevelle body and rebuilt almost everything underneath it from scratch — new frame, new engine, new rear axle, new suspension — keeping very little from the car Chevrolet actually built in 1970. The result still wears gray metallic paint, black SS stripes, and the cowl-induction hood that made the Chevelle famous. What’s bolted beneath that sheet metal, though, has more in common with a modern performance car than with anything that left the factory floor.

The Frame That Isn’t From 1970

The video comes from Vanguard Motor Sales, a Michigan dealership known for walking customers around its new arrivals before they ever leave the lot. This one, cataloged under VIN 136370R205809, gets the standard treatment: a slow lap around the exterior, a tour of the cabin, and a rundown of what’s actually holding the car together underneath. The dealer calls it a full frame-off, rotisserie restoration — meaning the body came off its original structure entirely before anything else happened.

That distinction matters more than it might sound. A straight restoration usually means putting a car back the way it left the factory. What Vanguard describes instead is closer to a ground-up rebuild that borrows a classic body as its starting point. The chassis underneath this Chevelle is a silver Art Morrison frame — not the frame Chevrolet welded together in 1970, but a purpose-built aftermarket replacement designed from day one to handle more power and corner harder than the original ever could.

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Why a 454 Didn’t Need to Stay a 454

The Chevelle SS this car is built around was one of the defining muscle cars of its era. For 1970, Chevrolet offered the SS package with either a 396-cubic-inch or 454-cubic-inch big block, and the top-of-the-line LS6 454 was rated at 450 horsepower and 500 lb-ft of torque — numbers that made it one of the most powerful engines GM ever put in a production car. But the LS6 was also rare: Chevrolet built roughly 8,773 Chevelle SS models with the 454 that year, and of those, only about 4,475 carried the LS6 option across the whole model run — less than 8 percent of the more than 53,000 Super Sports produced for 1970.

That scarcity is a big part of why original LS6 Chevelles now command six-figure prices at auction, and why most enthusiasts who want 1970 Chevelle SS performance without a six-figure budget end up building something like this car instead. Rather than chase an increasingly expensive and hard-to-find factory LS6, builders start with a more common Chevelle body and replace the guts entirely — frame, suspension, drivetrain — with modern components engineered to outperform anything available in 1970.

That’s exactly the approach here. Under the hood sits a GM-sourced LSX454 crate big block, paired with electronic fuel injection and a 4L75E four-speed automatic transmission. Power runs back through a Ford 9-inch rear axle fitted with a 3.55:1 posi gearset — a combination builders favor specifically because it can handle far more torque than anything GM ever installed in a Chevelle from the factory.

The 1970 Chevelle itself didn’t need the LS6 to be significant. That model year marked the peak of GM’s second-generation A-body design, with hidden windshield wipers, a revised grille, and the cowl-induction hood option that fed cold outside air directly into the carburetor for a genuine, if modest, power gain. Chevrolet sold the Chevelle in dozens of trims and engine combinations that year, but the SS package — with its blacked-out grille, dual exhaust, and either big-block option — became the version collectors chased hardest once the muscle car era ended and nostalgia for it began building through the 1980s and 1990s.

Where a Chassis Like This One Comes From

Art Morrison Enterprises, the company behind this Chevelle’s frame, has been building aftermarket chassis for classic American cars since the early 1970s, long before the term “restomod” existed. The company built its reputation supplying frames to hot rod builders working on much older cars — Tri-Five Chevys, early Camaros, pre-war coupes — before expanding into complete chassis kits engineered specifically for muscle car bodies like the Chevelle, Nova, and Camaro. Rather than reinforcing or modifying a factory frame, an Art Morrison chassis is built from the ground up with modern suspension geometry, so the finished car can run coilovers, larger brakes, and wider wheels that were never engineered to fit the original unibody or frame rails.

That approach became especially popular once LS and LSX-based GM crate engines made big horsepower numbers easy to buy rather than build. A factory 1970 frame was never designed around 600-plus horsepower, modern tire widths, or four-wheel disc brakes, so builders chasing that kind of performance in an old body increasingly skip modifying the original chassis altogether and start with something like this Art Morrison frame instead. It’s a trade some purists still resist, but it’s become the default approach for anyone building a classic muscle car to drive hard rather than simply display.

What a Buyer Is Actually Choosing Between

The chassis swap is where this build separates itself from a typical restomod. Art Morrison’s frames are built from the ground up for classic muscle car bodies, with modern geometry, coilovers front and rear, and sway bars at both ends — upgrades that let a 55-year-old body handle like a current performance car instead of a 1970 sedan. This particular Chevelle also rides on staggered 255/35R18 front and 305/35R19 rear wheels, power rack-and-pinion steering, and four-wheel disc brakes, none of which existed as factory options when the real SS 454 debuted.

Inside, the changes are less dramatic but tell the same story: a black vinyl interior with bucket seats and a center console, custom gauges mounted in the original factory locations, and an aftermarket air conditioning system squeezed into a car that never offered it from the factory. It’s a deliberate blend — modern comfort and capability wrapped inside a body built to look exactly like the car Chevrolet actually sold.

For anyone shopping this kind of car, the real decision isn’t about which Chevelle is faster — a modern LSX-based build will out-accelerate, out-brake, and out-corner almost any factory 1970 Chevelle SS, LS6 included. The decision is about what a buyer actually wants to own. An unrestored or numbers-matching LS6 Chevelle is a historical object: every part traces back to the day it left the assembly plant, and its value is tied directly to how much of that original character survives. A restomod like this one is the opposite kind of collectible — its appeal comes from pairing a shape everyone recognizes with mechanical parts nobody has to baby.

That trade-off shows up in the resale market too. Restomods built around well-known aftermarket chassis brands like Art Morrison tend to hold value better than one-off backyard builds, because buyers can verify exactly what underpins the car and trust that a reputable shop installed it correctly. A documented build sheet, a known chassis supplier, and a traceable VIN — all present on this car — are what separate a transparent restomod from a mystery build with an unverifiable past.

Dealers selling cars like this one increasingly lean on detailed walkaround videos and dozens of photos precisely because a restomod can’t be judged the way a numbers-matching original can. There’s no factory build sheet to decode, no trim tag to cross-reference against a GM data book — the only way to verify what’s actually underneath the paint is to see the components named and shown directly, the way this video does with its frame, engine, and rear axle. For buyers used to shopping unrestored classics, that’s a genuinely different process: less archival research, more trusting that the shop that built it documented its own work honestly.

Watch the full video above and let us know your thoughts in the comments.