What is the difference between tuning up your propane GMC truck and tuning a regular gas truck?
"Answer_Difference_tune_for_propane_than">Answer Difference tune
for propane than
The only diffence is spark plug gap .34 instead of .45 or .60
propane needs a hotter spark other than that it,s the same. Hope
that helps you TJ
I would adjust the timing for best performance without more than
a bit of knock under maximum load. I recall that with propand you
can run LOTS more compression.