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What is an estimation of horsepower and torque on a chevy 502 crate motor with headers and two 780 holley carbs?? What is the maximum rpm the engine can run with these modifications?? What is an estimate on top speed with 7.18 gears and 48 x 31 tires?? I'm building an off road machine. What is more important for off roading, horsepower or torque??
 

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48X31 tires?? Those gears are real steep but I'm sure with the taller tires they are a little more reasonable sounding.

Which 502 are you looking at? There are 3 of them to choose from in the 99 GMPP catalog. The 502HO has 450HP @ 5500 and 550 ftlbs @ 3500. The ZZ502 has 502HP @ 5500 or so and over 500ftlbs just off idle with a peak of 567 @4000. Then there is the towing 502 with 325hp @4200 and 512ftlbs @ 2800.

Anyway lowend torque is what you want considering you'll be operating at slower speeds. Good lowend torque with a BB is easy.



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JT
71 SS Vortec 355
www.angelfire.com/co/KellyMotorsports
 
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