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The 1970 Firebird in the listing photos looks perfect: fresh paint, straight panels, a Formula 400 hood that promises everything the second-generation Pontiac was famous for. But on these cars, the part that matters most is the one you can’t see from the curb. The front of the car rides on a bolt-on subframe, and everything behind it depends on a unibody floor and rear frame rails that have now been flexing, rusting, and getting patched for more than half a century. A car that’s gone soft in the middle will show it in sagging door gaps, cracked seams, and a chassis that twists every time you lean on the throttle. Before you fall in love with the paint, you need to know what’s holding it together, and this guide will help you avoid buying a beautiful body sitting on a tired structure.

Ford engineers had followed an unwritten rule for eighty-three years: production V8s do not rev much past 7,000 rpm without something breaking. The team behind the 2016 Shelby GT350 decided that rule no longer applied, gave the 5.2-liter Voodoo V8 a flat-plane crankshaft, and tuned it to 8,250 rpm. The result made 526 horsepower with no turbocharger anywhere in sight. Here is how they built an engine that could survive it.

For 1970 only, Chevrolet let a mid-size Chevelle carry a higher factory horsepower rating than any Corvette on the order sheet. The LS6 454 was rated at 450 horsepower, and just 4,475 SS454 LS6 Chevelles were built across every body style. Historians estimate as few as 20 to 25 were convertibles. Read on to find out what made this Cortez Silver drop-top one of the rarest Chevelles ever built.

The 1967 Dodge Coronet R/T arrived with a 440 Magnum as standard equipment, which meant the buyers who checked the box for the optional 426 Hemi were deliberately walking past 375 horsepower to get something angrier. Very few did. The resulting cars are among the rarest Mopar muscle machines of the era, and this Brothers Collection example shows why. Read on to find out what made the combination so uncommon.

Plymouth once paid Warner Bros. $50,000 just so the Road Runner could borrow a cartoon bird’s name and its ‘beep-beep’ horn — and it turned into one of Detroit’s best-ever marketing bets. By 1970, the car had a redesigned Air Grabber hood and a genuine 425-horsepower Hemi option, but only 152 buyers ever ordered one. This numbers-style 440 Six Barrel hardtop shows what nearly everyone else actually drove home instead.

Dodge’s new 550-horsepower Charger Scat Pack borrows a nameplate that goes back to 1969 — but the original “Six Pack” didn’t have six cylinders at all, it had six carburetor barrels bolted to a 440 V8. A week of real-world commuting captured with binaural microphones shows what the twin-turbo namesake actually delivers: a 3.7-second 0-60 time and a driving experience nobody expects from a car named after a decades-old carburetor joke.


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