Thanks for the props, I'm really stoked about the outcome.
Thanks DG, good luck with winning that $20 if your is able to run on pump.
See below grasshopper and follow the conservative path to engine testing.
Save me a lot of typing there GW.
The gas was some leaded 110 sold at the local MN race shop.
The old style combustion chamber in these heads requires a lot of timing and 11 to 1 with iron heads is pushing it. The DCR looked a little higher than I'd be excited about running on 91 during tuning.
Max power came with 40 deg of timing. My distributor is locked out and wired to a digital 6 MSD on the dyno. I have a 6AL II that allows you to program in your timing curve that I will run in the car. For street use I'll program a fairly lazy advance curve all in at 3k and retarded 2 deg to 6500 or maybe redline. If vp 100 is available on a track day I'll run it with the distributor locked out to the digital 6 box with no curve or I'll flash in an aggressive curve to 40.
Actual road manners and on track performance isn't alwyas dialed in after a dyno session. I believe it is just getting you in the ballpark and ensuring nothing is going sour in a controlled environment.
AF meters are a good indicator of possible danger but tuning to a number on those sensors isn't the way to go. Tune the motor on the dyno for power. If it is unhappy with the small changes you make the power output will start showing you are headed to trouble before you hurt something.
I have an LM1 that I will use to do some final road tuning on the jetting.
I personally think at my compression level the 110 hurt the hp figures some (some as in very little but no gain). + I need to give DG every chance to give you bowtie guys a win
I don't think running it on 91 on the dyno would have led me to different jet sizes. I think one of the rags even did a dyno shootout with gas to prove that fact a few years back.
I'm the rookie in the group of three of us at the dyno, one guy owns the dyno and the other guy is a long time racer, builder and NHRA record holder. Both of them have done hundreds of pulls. They liked the plan and so did I. So that is the plan we went with.
