Originally Posted by rx1300
a couple of guys on other threds have just simply said that 460s wont make any more power than it did, but i dont belive them. At the end of the day, my truck weighs 3.1 tonnes and i load it with up to 5 tonnes, thats a total of 8.1 tonnes!!!! What i dont understand is how a small block 302 or 351 can make shitloads more power and torque on a dyno, but there is no way those motors could pull the kind of weight my 460 does??
one thing- you did get near 200rwhp on a dynodynamics, so with whats been seen on other threads, you have about 1/3 more at the crankshaft- if its a lower compression motor 300hp aint bad- especially if its giving you a lot of torque right off idle to get all that weight motivated. where a smallblock can get more than 300 hp easy, it probably wont get it down low where a big truck would want it...stoplight to stoplight the bigblock probably pulls you around never needing over 1/4 throttle, probably never making over 100 hp- but it does the job. a smallblock in similar power demand would need more gearing, more shifting, have to rev higher and wear out faster.
Something that would be interesting to see would be CFM thru the carburetor per ft/lb torque- ill bet under 3000 rpm where day to day driving is done the bigblock will be 2-3 times the torque...especially if its a high powered smallblock as the big cam and heads required for high rpm really hurt the bottom end- usually this is compensated for by a loose torque converter and steep gearing, but these wont work very well on a work truck. apples and oranges.
Bottom end torque you can feel on the street, stoplight to stoplight, everyday, without ever putting your foot to the floor, high rpm horsepower is really only useful on the racetrack or getting in trouble on the street. A 12:1 289 with 5.13 gears would be quicker, but would probably be noisy enough to attract the police, and your arm would tire from all the shifting. would get old quick. a purring bigblock will effortlessly get the job done and last a long long time. stroked smallblocks can make monster torque too, but the very short rods/deck heights create extreme rod angles that side load the pistons, etc, etc...they have to wear out faster from the increased friction.
If youre on the street where you cannot legally get ALL your horsepower to the road, what good is it? Its there in the hot smallblock, you can probably smell it from the fuel dripping out the tailpipes, and hear it from the loud unrestricted exhaust, and unsteady, lopey idle, the straining sound it makes trying to accelerate legally with a 10" torque convertor overheating the transmission, etc... but in legal driving around town, your 8 ton mild 460 probably gets from stoplight to stoplight just as fast.
Low rpm torque is long term streetable fun you can feel put you in the seat all day everyday stoplight to stoplight- max horsepower is short term serious business you measure in a handful of seconds a few times a week.
do a little porting/cam work to extend your torque curve a bit if its not strong enough, put nitrous on it if you need 15 seconds of adrenaline a week. then just drive it the other 10,065 seconds a week and enjoy it.
for the street you cannot beat the useable power of a bigblock.