I finally found what it's called!

Matchbox “Triple Heat” :-)

Here’s an example of what the Triple Heat looked like. It had a standard size Matchbox along with two smaller examples.
Here’s an example of what the Triple Heat looked like. It had a standard size Matchbox along with two smaller examples.
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I remember seeing the LTD set also...
I remember seeing the LTD set also...
...but I had the third-gen Camaro, which curiously says “350 Z” on the side, likely meaning 350 cubic inch Z28 IROC. Little did they know Nissan’s fifth-gen Z33 Fairlady would also be known as 350Z! I’m saddened that this is all that remains from my set, which dates back to 1992, putting me at six years old...
...but I had the third-gen Camaro, which curiously says “350 Z” on the side, likely meaning 350 cubic inch Z28 IROC. Little did they know Nissan’s fifth-gen Z33 Fairlady would also be known as 350Z! I’m saddened that this is all that remains from my set, which dates back to 1992, putting me at six years old...
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Matchbox Forum helped with the series name, but these pics can be found at Swifty’s Garage. Please check them out for more info:

http://swiftysgarage.net/topic/7557376/…

Thanks for reading, I’ve been searching for this forever!