timing BTC recommend for '94 454 TBI

[Tom_1991]

1994 Chevy Suburban K2500

454TBI

Mileage=155,000

Factory setting: 4BTC

Everything is stock.

 

Searched on internet, looks like some people set it at 8BTC or even 12BTC to get more torque and better MPG.

But seems like different year have different program, same setting on some year it runs good, some not.

I only use #91 gas from Shell or Chevron.  #91 gas allow more BTC, right?

 

Anyone have recommend about BTC setting?

Most time running light, only me in it with some tools weight no more than 100lbs.  On a test run from San Jose (CA) via I680N, I580N, CA120E, CA99S, CA140E, to Mariposa(CA), cruse at speed limit, most 65MPH, CA140 is 55MPH, most flat, get 13MPG in average. 

Plan to tow an utility trailer with a fully loaded truck camper on it (I live in the camper).

[TrustyRusty]

I have a similar setup, except in the form of a 94 extended cab long bed. Any info would be greatly appreciated.

[J F]

Leave it at 4 BTDC

 

Additional timing equates to higher CHTs and oil temp. These BBC engines run hot enough.