Dave6T4
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What are you looking at for horse power? Considering low compression, I am guessing around 375.
My new stock stroke 400 build
- Thread starter qkcuda
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icetech
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That is very cool... there isn't a lot of info/testing of those carbs and i wanted small primaries also.. Plus how could i hate a Gogglevalve
You're probably about right Dave. The old 400 was only 9:1 but it had 10 degrees more camshaft and it made just over 400 HP. Lower than 375 would be disappointing , but anything higher would be a bonus. I am almost more interested in the torque curve, that is what this heavy car needs.
gtxrt
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what brand Dyno are they using ?
Not sure. That picture is from 2005.
I picked up the transmission today. It turned out there was more work needed than I at first thought. The drum had a failed thrust washer, so it scored the thrust surface. The pump was also scored, and the gears were loose on the shafts in one of the planetaries. Fortunately he had lots of good used parts available, so it wasn't a problem.
I stopped by the shop today and dyno day is set for next Wednesday, fingers crossed.
My friend had a machine shop for a while. He had a SIM test machine which would heat the oil and spin the engine. You could somewhat break it in without running it.
He also had a Dyno with all his own instrumentation.
Smart guy.
He also had a Dyno with all his own instrumentation.
Smart guy.
Break in is my biggest concern Don, and making sure there are no oil or water leaks. After that I can enjoy watching the numbers roll by, and see how all my planning worked out.
Well after a tiring day I am home relaxing. The good news is there were no oil leaks or water leaks, and the cam broke in just fine. We made 7 pulls in total after break in. The best pull was with the 650 DP dyno carb, no surprise there. It made 420 lb/ft of torque at 3900 with over 400 lb/ ft from 3000 to 4300. Horsepower was a little disappointing with only 340 at 4800 rpm. I guess I needed more cam, but I did say low end torque was the goal.
After the Holley, we tested the AFB. It made 400 lb/ft at 4100 and 325 horsepower at 4900. The air fuel ratio was pretty good, and I didn't have a strip kit to change it anyway, so we switched to the Street Demon.
When we first put the Street Demon on it made 400 lb/ft at 3900 and 317 horsepower at 4800 rpm, but the air fuel ratio was pretty lean . We switched from 80 to 82 jets and it picked up to 405 lb/ ft and 332 horsepower. We then swapped out to richer metering rods and ended up with 497 lb/ ft at 3800 and 335 horsepower. A slightly smaller metering rod picked up low end torque a little, but peak torque and horsepower went down to 404/329.
What were the other carbs?
Sounds like a good day.
The bottom line was less horsepower than expected, but pretty much exactly what I expected for torque. The Holley was the winner in the carb derby, with the SD second and the AFB bringing up the rear. My goal was to run on regular gas and make as much low end torque as possible, so I think I met the goals. But then again, with better heads and a bigger cam.......
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I have a pretty good video of one dyno run with the SD, but I don't know how to upload it.
It was a good day, thanks. I failed to mention that the Holley was a 650 and both the AFB and the SD were 625's
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you have to put it on youtube
Dave6T4
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Congratulations on your dyno runs, Dave. They look like the numbers that Chrysler put on the 383 HP, with more compression.
gtxrt
Well-Known Member
Can't compare, Chrysler did not put headers on the 383.
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