Originally Posted by Oldsm
Im from Finland, europe.
How much tbi swirl port heads can safely mill? Nobody knows in my country.
Yes it has wind resistance but truck is not heavy, 4000lbs.
E85 fuel is one option but it must work with 95 octane too.
Can tbi stock ecm hold headers? I have heard that cam swap is too much and you need reprogramming.
Engine is fine and mpg is not poor, just thinking
So no engine swap.
Welcome to this Canadian website from an American/USA... LOL!
Usually mill until close to valve seat...
Weight hurts city driving MPG... wind resistance hurts open highway MPG...
E85 needs high compression ratio to be efficient... but gasoline needs lower compression ratio to avoid pinging... so hard to build to efficiently use both...
Engine prolly run slightly leaner with headers, improving MPG... A 'MPG cam' prolly wouldn't upset the ECM like a 'high HP cam' would.
Engine swap was just exploring all or most options...