300 inline six terrible power & mileage

Asked by Feb 08, 2017 at 06:42 AM about the 1976 Ford F-250

Question type: Maintenance & Repair

Why does my 300 straight six have terrible 'power' and even worse gas mileage? I
mean, it's terrible! What can I do to greatly improve both? I believe the tranny is a
C3; two barrel Carburetor.

2 Answers


Sounds like the the engine needs a tune-up and a good going over.

2 of 2 people found this helpful.

You don't mention the mileage on this beast so who knows how much wear and tear it has on it. Give it a tune up, check the timing, but if there is a lot of wear on the rotating assemblies there's only so much you can do without digging deeper into the motor.

2 of 2 people found this helpful.

Your Answer

Ford F-250 Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Ford F-150
606 Great Deals out of 10,666 listings starting at $3,000
Used Ford F-350
3 listings
Used Ford Mustang
11 Great Deals out of 1,082 listings starting at $4,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.