340 dyno chart thoughts

fez440 said
I have 2 questions. does a engine gain power once it is "broken in" if so why? also will it gain power once the beak in oil is changed? I assume yes since it's lower viscosity. if so by how much hp and I assume oil psi will drop some as well correct ?

Yes. As a matter of fact you will often in the first couple dyno pulls see the HP going up with no other changes. This is your rings breaking in.

It will gain a little power when the oil is changed IF you go to a higher quality oil. HP change will vary. Oil PSI doesn't necessarily drop unless you drop viscosity.

jimbo17 said
I do not know why all you guys run such low idle vacuum numbers. I have a 360- 410 stroker in my aussie charger. It has a hughes 228-232 roller cam in it with 800 edelbrock carb with RPM air gap manifold. Vacuum is 14 @850 revs and 15 @ 1000revs. Plenty for power brakes to work well.

You essentially have a big block with small block heads on top of it, a small modern roller cam. Your results aren't surprising.