What do you think this will run 1/4 mile
03-01-2006, 12:21 PM
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What do you think this will run 1/4 mile I have a 1977 gmc sierra long bed race weight of 4100 with me in it. I just bought a Gm performance crate engine. It has 300 horsepower stock. Over stock I put a 750 carb, Performer Rpm Intake, big tube long tube headers, X pipe, hei dist and electric fans. I think it is putting anywhere from 230-250 rwhp, 315-330 crank. It has 4.10 posi 26" drag tires, with a Th350 trans w/ a 2800 stall. with the old motor and 3.40 gears and no stall converter I ran a 15.74 @ 85.25 mph. The old motor only had 198 rwhp, About 245 crank. Let me know what you all think, Thanks, Jared
03-01-2006, 01:32 PM
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14.41@90.31 with 235rwhp@4100lbs Here is the calculator I used.
http://www.richmondgear.com/112901.html
http://www.richmondgear.com/112901.html
03-01-2006, 08:19 PM
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what size are the primaries on those big tube headers? with that small of a motor, and that heavy of a truck, i would hope they're the 1 5/8". you need torque for that pig! lol. especially with the gearing you've got to take advantage of it. also, i hope your exhaust system is a cat free dual 2". the X is great though, good mufflers i'm guessing too?
03-04-2006, 02:39 PM
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Well I have no cats no mufflers, 2-1/2'' true dual. Headers are 1-5/8''. Well I have raced an LT1 and a 2001 mustang GT and beat both of them so I am guessing 14.20-14.50. I beat the mustang by about 4-5 car lengths, and the camaro LT1 by about 2 lengths.
03-04-2006, 06:25 PM
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Yea, 1 5/8" primaries are ideal for that set up, you need every bit of torque you can make to help get that beast moving. I would'nt consider them "big tubes" though. If you ever wanna muffle it down and maintain power I recommend a pair of magnaflows or dynamax ultraflows.