Timing and advance for heavy truck

[shalashaskah]

Hello everyone,

I have an 83 Chevrolet C30 dually with an SM465 4 speed manual and Dana 70 rear end with 4.11 gears. In it is a 2004 5.3 from a Tahoe with the flex fuel injectors ad a returnless fuel rail. Other than that its all stock all the way to the air filter assembly. It's a heavy vehicle and I've been using the HP Tuners repository to compare timing tables from 2500 suburbans and pickups to help get me where i need to be as far as trying to make changes where necessary to compensate for the heavy weight. If i post my recent tune would anyone mind checking it out just to ensure that i have made the necessary changes? The truck is low geared so it does not see interstate use and very little highway use. Maximum i would have the truck up to is around 60-65 mph. But i will use it for pulling and it needs to be correct.

8.25.Changes.new.plus.old.revised.hpt

Thank you in advanced for any and all help

[RDF1]

What fuel octane? What Spark Plugs?

[shalashaskah]

I'm running mid grade 95 octane and the factory AC Delco spark plugs

[gtstorey]

Sounds like OP is likely in a non North America location so "mid grade 95" is likely US 89 or so.