Those are great results, Mark, they will make a HUGE difference in that truck. Thanks also for the rocker pics. I'm a big fan of steel rockers, when they are available, because they don't have the limited life that aluminum rockers will typically have. They are heavier, of course, but in an application like yours weight isn't really a concern, so they are probably a really good choice, especially after replacing the adjusters.
Tell us more about the dyno experience. What surprised you, what didn't, etc. How much tuning did you do on the engine? Timing, carb, or ??
Thanks so much Jay.
I had one of the most fun days of my adult life. I loved it. Even the pre dyno pull stuff of fitting the engine and making things work.
Solving problems was great fun.
What surprised me was the hp numbers (high of 411). I seriously was not shooting for a big horsepower number and thought we'd come in from 350 to 375 because of the stock D2s, low cr and mild cam. I think that the ending combination of good parts and solid assembly (for instance back cutting the valves) made the difference. I think also that that cam though mild is well thought out.
I WAS shooting for torque. The dyno we were on only spat out numbers from 3100 up and I would've loved to see the 2500 numbers. That's probably where it made most of its torque.
Was very pleased that it held it's numbers throughout the pull pretty well.
We started it up on an 830 Holley shop carb because it was a known factor. It made the most hp but not as much torque.
I figured I was going to run a 650 on the street but I have a 700. We installed the 700 and everything was pretty much as before but hp was down a little and torque was up. But very slightly on both accounts. Didn't even bother with the 650.
As far as timing we knew the basics and started there 12 initial and 33 to start with in by about 25 or 2600. Light springs in the MSD from the beginning. We went to 36 but it didn't seem to need it or want it and we ended up a hair over 34 total.
It just kept repeating the same numbers and acted great the whole time.
We could have tuned a bit more but it was late and we collectively were very happy with it.
Now I understand why you have a dyno. It is a blast, I'm hooked.
