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They are not a "competely new design" engine. They're just stroked Vortec 454's , GEN6. Take a 454, throw in a 4.25 stroke crank, bore it .060 over, and presto - 496 or 8.1L.
You could build a sweet ZZ496 with one of these I would think.
Here's the specs:
GM 8.1L Gasoline
Engine type: V-8, cast-iron block and heads
Bore x stroke, in: 4.25 x 4.37
Displacement, ci/L: 496/8.1
Compression ratio: 9.1:1
Valve gear: 2 valves/cyl, OHV
Fuel induction: Sequential multiport
Horsepower, hp @ rpm: 340 @ 4200
Torque, lb-ft @ rpm: 455 @ 3200
Recommended fuel: Unleaded regular
Max GCWR, lb: 22,000
Max towing capacity, lb: 15,800
Option price: $850
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'68 CST SWB factory 396/T400
buddy buckets, a/c, ps, pb
'72 Corvette convertible 454/4spd/ac, ps, pb
'73 GMC Sierra Grande short wide 454/T400 ps, pb, ac
'77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original
'78 GMC Sierra Classic short wide 454/T400 ps, pb, ac
'72 GMC Sprint SP454. 1 of 38 built.
'73 GMC Sprint SP454. 1 of 71 built.
'75 GMC Sprint SP454. 1 of 25 built.
SOLD! '72 GMC K25 4x4 468/4L80e/NP205
build thread
http://67-72chevytrucks.com/vboard/s...23#post4324423
SOLD!'55 Chevy gasser 496/4spd
build thread
http://67-72chevytrucks.com/vboard/s...96#post4324396
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