Hennessey has taken the already menacing Dodge Viper and turned it into a 585-cubic inch (9.5-liter) monster, just in time for Halloween. You’d expect that this much displacement would deliver a mountain of torque, and thankfully the Venom 800R, as its known, doesn’t disappoint. Claimed figures read 810 horsepower and a matching 810 pound-feet of twist.

To make that kind of power, engineers had to modify all the internals including adding forged pistons, ported heads, a big bore custom header and exhaust system, plus a cold air intake. The entire process takes the tuning house twelve weeks from start to finish.

Though the Venom 800R is naturally aspirated, it gives its 1,000-hp, twin-turbocharged cousin a run for its money. The 800R reaches 60 mph from rest in 2.9 seconds and passes the quarter mile in 10.88 seconds at 136 mph. Top speed is a claimed 230 mph.

Visual appeal comes in the form the full Viper SRT body kit, which includes a new front bumper and rear spoiler. The Venom 800R will make its debut later this week at the 2006 SEMA show in Las Vegas.


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