Both! So much more power and speed today. In '76 I had a '71 LT-1 that I always considered a sports car. However I was beeting hopped up Z-28's and other muscle cars. So I figured it was both, though I still think of it as a sports car.
2012 Cyber Gray Grand Sport
Corsa Exhaust, Nav, HUD, A6
The term Muscle Car has always been thrown around too loosely anyway.
To be pedantic about it, muscle car is specific to the concept of installing a large v8 (B body) into an intermediate body (A body), as gm first did in 1964 with the pontiac gto. there's a long story there about how Pontiac (estes, dalorean etc) were able to circumvent the company edict banning such practice, thereby starting the muscle car craze which was ultimately short lived. Sadly I wasn't born yet to see it
I tell you one thing most mustangs and camaros have a hard time falling into the category. IMO F bodies don't really make the grade even the small percentage that had big engines, maybe that's just personal. Corvettes have never even been in the conversation but obviously it's not because they weren't fast, or powerful or "muscly".
Location: Palm Harbor not far from Sebring Florida
It has always been a sports car, Even my first one I considered a sports car and it was a "66 427/425. But it was a two seat roadster.
Real muscle cars were the 427 or 454 Chevelle's, 426 Street Hemi's, 421 Pontiac and the 442's. Camaro's and Mustang's were pony cars in their early days. I guess now that would be the muscle cars.
I always considered the difference and still do, is a sports car handles completely different in the fact is it is at home on a road course where a muscle car like the straight line brute force, but is lost on the twisty bits.
Real muscle cars were the 427 or 454 Chevelle's, 426 Street Hemi's, 421 Pontiac and the 442's.
Let's not forget the 389, the one that started it. Then the 400, and unfortunately the 421 never made it into a muscle car, not from the factory anyway, nor the 428. 455 was a brute though, all mentioned being pontiac varieties, of course. None of which big blocks.
chevy 396 4 bolt is worth mention, likely one of the best big blocks ever.
And Im not trying to pick at you but 442 is not an engine.
...I always considered the difference and still do, is a sports car handles completely different in the fact is it is at home on a road course where a muscle car like the straight line brute force, but is lost on the twisty bits.