1970 Plymouth GTX in Lemon Twist Yellow & 440 + 6 Engine

Jeff Fleming has owned several muscle cars, but his Lemon Twist Yellow 1970 Plymouth GTX, bought in 2013, is the one he’s still eager to show off at a car meet in Northwest Indiana. The 440 + 6 badge on the fender tells Mopar fans exactly what’s under the hood, a Six Pack setup that separated this car from a standard 440. Hear Fleming explain why this specific GTX made the cut.

Some muscle car owners collect cars the way other people collect stamps, one after another, kept at a careful distance. Jeff Fleming is not one of those owners. By the time Lou Costabile catches up with him in Northwest Indiana in February 2017, Fleming already owns several muscle cars, and the Lemon Twist Yellow 1970 Plymouth GTX he is standing next to has been his since 2013, a car he clearly still wants to talk about years after buying it.

A Color Choice That Was Never Meant to Be Subtle

A Color Choice That Was Never Meant to Be Subtle
Lemon Twist Yellow was one of Chrysler’s high-impact paint colors from the era, a shade designed specifically to be impossible to miss in a parking lot, and Fleming’s GTX wears it exactly as intended. High-impact colors like this one have become some of the most sought-after factory paint options among Mopar collectors precisely because so few buyers had the confidence to order them new, making surviving examples in these shades disproportionately valuable today compared to more conservative factory colors.

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The 440 + 6 Badge That Tells the Real Story

The 440 + 6 Badge That Tells the Real Story
The engine badge on this GTX reads 440 + 6, shorthand for Chrysler’s 440-cubic-inch V8 fed by a six-barrel carburetor setup rather than a single four-barrel, a combination that pushed output well past what a standard 440 could manage. The Six Pack, as Mopar enthusiasts commonly call this configuration, became one of the most respected performance options Chrysler ever put on an order sheet, and cars carrying it authentically from the factory command a real premium over four-barrel equivalents today.

Why Jeff Fleming Bought This Specific Car in 2013

Why Jeff Fleming Bought This Specific Car in 2013
Fleming’s ownership history matters here: this is not a car he inherited or restored from a barn find years earlier, but one he specifically sought out and purchased in 2013, already an established muscle car enthusiast with several other cars to his name. That kind of deliberate, informed purchase tends to mean a buyer who understood exactly what a 440 + 6 GTX represented before signing anything, rather than someone discovering the car’s significance after the fact.

What Made the GTX Different From a Standard Plymouth Road Runner

What Made the GTX Different From a Standard Plymouth Road Runner
The GTX and the Road Runner shared a platform but were positioned differently by Plymouth: the Road Runner leaned into a stripped-down, budget-performance identity, while the GTX aimed at buyers who wanted comparable power wrapped in a more upscale trim level, making it the Road Runner’s more refined sibling rather than a direct twin, with standard equipment the Road Runner treated as an options-list afterthought.

Why the Comment Section Turned Into a Confession Booth

Why the Comment Section Turned Into a Confession Booth
One viewer comment describes owning a ’70 Road Runner with a 383-horsepower engine and an air grabber hood, rebuilt using original Direct Connection parts catalog components for 11-to-12-second bracket racing, a response that shows exactly the kind of audience this video draws: not casual viewers, but owners and former owners eager to compare notes on their own Mopar builds and the parts catalogs they used to keep them running.

How This GTX Compares to Its Big-Block Rivals of the Era

How This GTX Compares to Its Big-Block Rivals of the Era
A 440 + 6 GTX went head to head in period with the Chevelle SS454, the Buick GSX, and the Ford Torino Cobra Jet, each brand offering its own six-barrel or multi-carburetor answer to the same horsepower race, and the GTX’s blend of Plymouth’s mid-size platform with genuine top-tier Mopar power kept it competitive against every one of them on a stoplight-to-stoplight basis.

Why This Interview Format Keeps Working

Why This Interview Format Keeps Working
My Car Story’s format, letting an owner like Fleming talk through his own car on camera rather than narrating specs over B-roll, is exactly why details like the 2013 purchase date and the Six Pack badge come through as naturally as they do, turning what could have been a simple car show clip into a genuine ownership story worth the several minutes it takes to watch.

What a 440 + 6 GTX Commands in Today’s Collector Market

What a 440 + 6 GTX Commands in Today’s Collector Market
A documented, factory-original 440 + 6 GTX in a rare color like Lemon Twist Yellow sits firmly among the more valuable Mopar B-body muscle cars in today’s market, with the Six Pack option alone often adding a substantial premium over an otherwise identical four-barrel 440 car. Fleming’s decision to buy specifically this configuration in 2013, rather than a more common four-barrel GTX, reflects exactly the kind of informed collecting decision that tends to hold its value best over time. The Six Pack’s three two-barrel carburetors also make it a more complex car to service correctly than a single four-barrel setup, since keeping all three carburetors synchronized requires a level of tuning expertise fewer mechanics carry today than they did when this GTX was new, which adds another reason genuine, well-sorted examples like Fleming’s command a premium over cars that have had the induction system replaced with a simpler aftermarket setup. Finding a mechanic willing to properly balance three carburetors rather than simply swapping them out has become its own small challenge for Six Pack owners, which is part of why Fleming’s evident hands-on familiarity with his own car, clear throughout the interview, matters as much to keeping it running right as any parts catalog does, and it is exactly that hands-on knowledge, more than the badge on the fender, that keeps a Six Pack car like this one running the way Chrysler engineered it to in 1970, long after most of the specialist Mopar mechanics who originally serviced these particular cars brand new decades ago have already fully and permanently retired from the trade entirely for good.

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