73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: frickenbored on March 15, 2010, 08:00:06 pm
-
It getting close to the time to buy a torque converter but I'm not sure on what stall to get. The motor is a 383 with a very rough idle due to the big cam, its a th400 built trans with a mild shift kit, 4.10 gears and 36" tires. I'm thinking a 3200 to 3500 stall torque converter. Does this sound right?
-
What are you gonna use the truck for? Daily driver? Mud truck?
-
What are you cam specs, compression, etc.. We need more information than "big cam"
-
well the compression is 10.5:1 As for the cam specs I really don't know, when I bought the block the bottom end was already built and the cam was already in it. I remember measuring the lift and duration but of course I didn't write it down. It was something like .4-- duration maybe .450? but i'm not sure. What I do know is that it maxes out the lifters and the motor has a very rough idle. As for the trucks usage, its going to be mostly a mud truck with the option to use it as a daily driver maybe 1 or 2 days out of the week.
-
etc means what cam profile as in what you really have, rpm range, cruise range, duration, calculated compression, size of the motor, type of transmission, final drive ratio, and tire size. All these play an important part in determining optimum stall speed. Stock is roughly 1800.
Are you guessing on the compression like the lift or was it measured with the current heads on it, What do you mean maxes out the lifters? rough idle could be caused by incorrect timing, so having this information is important. When you were selecting a cam they typically give you a range of requirements to match all the pieces together.
-
etc means what cam profile as in what you really have, rpm range, cruise range, duration, calculated compression, size of the motor, type of transmission, final drive ratio, and tire size. All these play an important part in determining optimum stall speed. Stock is roughly 1800.
Are you guessing on the compression like the lift or was it measured with the current heads on it, What do you mean maxes out the lifters? rough idle could be caused by incorrect timing, so having this information is important. When you were selecting a cam they typically give you a range of requirements to match all the pieces together.
The compression was measured with the current heads at 10.5:1 and I should have said the cam maxes out the rockers which are comp cams blue ceramic coated aluminum roller rockers, in the open position. The rough idle is not caused by incorrect timing. And like I said I did not buy the cam. I bought this motor in pieces from a friend of mine who bought it off craigslist. I had no idea it was a performance motor untill I got it done, put it in the truck and started it up open headers, my buddies dad who is a hardcore drag racer ran out and was amazed at how this engine sounded and he confirmed that it was indeed a massive cam. So I took it out of the truck and threw a bunch more performance components, like intake, 770 holly carb, msd ignition ect... I remember me and my buddy measuring the lobes of the cam but I don't remember what it was. As for the rest of the truck, its a performance th400 with a mild shift kit, 4.10 axle gears, and the final tires will be 36" Oh and the motor is a 383 stroker. I haven’t been able to drive the truck with this motor in it too much seeing that it blew my 700r4 to pieces but when it did work this motor pulled from 2000 to 7000 rpm and kept going, I had to put a rev limiter on it because I had almost hit 8000 rpm. But it really pulled in the higher rpm range. About 4000 to 7000
-
sounds like the cam i have in my truck
234/244*@.050 .488/.510 lift(installe 1/6 rockers so finall lift is .522/.544)
i run a B&M holeshott 2400 convertor.. does really nice
-
I would run 2500 to 3000 stall. I had an 86 2x short wide with a 400 horse 327. It had a fireball 302 with 480 lift. and my stall was 2500-3000 stall and it did fine.