Because that's a dual overhead cam 4 valve per cylinder engine with vastly superior cylinder head development, better cylinder head sealing, more efficient cooling system, much larger engineering margins, designed to be turbocharged with significantly more aftermarket support. That engine is probably turning 8 grand. And you can drive it on the street like that. A 250 radical enough to spin 8 grand will not be streetable at all. You just can't squeeze a chevy 6 that hard, the head and block decks are just too thin. We're fighting a poor head design as well. I had one of these to put in my 71 mustang with 272 cams, a header, HX40 turbo, and greddy i'c (600hp setup), then Fast & Furious Tokyo drift came out and suddenly I was a copycat, so I sold it. I wonder sometimes if I shouldn't have kept it and used it, but the 292 will look so much more appropriate, and you just can't beat that chevy 6 sound.
"The first rule of overkill: You can never have too much overkill." "Overkill is underrated."
