What kinda gains??
#1
What kinda gains??
Im looking at a 383 and want to know how much of a gain is possible just switching from my 355 with a 234/238 610/610 112lsa cam. Car will be exactly the same except it will have the extra cubes and a new cam in the 24x/24x -61x/61x range
#5
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Hard to say. I have changed things that have gained 50hp and only went 3 tenths faster. My last swap gained zero up top but 20hp and 15 tq under the curve and gained 2.5 tenths and the 60 foot was way worse. I would say the 383ci will gain around 30lbs tq and if the cam works with the heads/intake you should see two to four tenths faster. thats my guess.
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#11
Close to the same time and more than likely b4 winter is over it will all be done. Stall will be in the 4000+ range and the car will rev to about 7k. I already have the trans and shifter just need the converter for it. Keep in mind this will be a primarily track car with some street use. Its not a DD or anything like that.
#13
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240/252 107lsa made 400 rwtq at 2800rpm and 450rwtq from 4200-5200rpm in my last 383 through a 6 speed. How much low end do you need
#17
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Not unusual for these to go from 0 to 60 in 3.9 seconds. The 350s are capable of doing it in about 4.5 seconds. These engines can easily get 450+ HP and develop 460lbs of Torque. The car can really launch with this setup. Again matching it up with the right Transmission and Clutch among other upgrades is a must.
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You have to match the cam according to what you are going to be using the car the most.
Operating under the assumption that most people want to maximize the performance of their vehicle (as opposed to just operating the engine at as high an RPM as possible), the tire size, combined with the final drive ratio, will determine the engine speed required. For instance, a vehicle with a final drive of 3.42:1 and a tire diameter of 26” will only see about 5400 – 5600 RPM through the lights in high gear in a quarter mile run. Selecting a cam that will make maximum power in the 2500 – 5600 RPM range will provide the best ET. MPH might be higher with a bigger cam, but ET will suffer. This is because MPH is related to peak horsepower, but ET is related to best average torque in the RPM range. Heavier vehicles require a cam with more low end torque than lighter vehicles because it is much more difficult to get a heavier vehicle moving. Automatic transmission vehicles require a camshaft that has idle and low RPM characteristics compatible with the torque converter to be used.
I recommend that you don’t exceed 600 lbs. of open pressure and limit valve spring seat pressure to 240 lbs. on bracket racing applications and 220 lbs. for street applications.