300 Inline 6, Rebuild or Swap? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 4 (permalink) Old 11-10-2005, 03:46 PM Thread Starter
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300 Inline 6, Rebuild or Swap?

I've got a 93 F-150 with a fuel injected 300 Inline 6 cylinder motor with an automatic transmission. The motor runs good but the gas mileage is not so good (12-14 mpg). I figure if I'm gonna get lousy mileage I may as well have pretty decent performance, do you recommend I rebuild the existing motor or should I swap it out for a 302 or 351? I've spoke with a few local machine shops and they've never rebuilt a 300 with performance in mind so I'm a little hesitant to have them build the motor. I'm in Georgia, if anyone knows of a shop that is familiar with what makes these motors really run well I'd be interested in talking with them. Thanks.
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post #2 of 4 (permalink) Old 11-14-2005, 06:51 PM
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300 Inline 6, Rebuild or Swap?

I don't know whether a 300 six can be made to perform like a V8, but since I just moved from an `89 inline with stick to a `93 351 automatic, I'll say this much.

The six had far more low end power. I got about what you report as milage 12-14, but now I get 9-12. I've added new high capacity cats, Flowmaster exhaust and an air induction system, but the milage stays the same. The ability to get off the line fast is fun, but listening to the trans shift down on a medium grade is irritating when I know my 300 cube would have tugged up the thing with no problem. I'm thinking that if what you are looking for is pull power, either stay with the 300-6 or go to a 460-8. Mileage isn't going to improve in any event. I really do get some pretty decent performance out of the 351 and it is fun listening to it, but it is a truck after all and I'll always miss the 4.9L that got trashed in my driveway by a runaway Mustang.
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post #3 of 4 (permalink) Old 11-15-2005, 06:53 PM
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300 Inline 6, Rebuild or Swap?

Found this and thought I'd pass along. 5.0 would give better economy.
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post #4 of 4 (permalink) Old 11-19-2005, 06:45 PM
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300 Inline 6, Rebuild or Swap?

I would say this: I would build the 300, I have two trucks ,a 1965 Ford F100, with a 460 and c6, and a 2005 F250 4x4 6.0 Power Stroke. Think about what you use this truck for and if you think that you will make mileage improvements ...FORGET IT! I once had a 1979 F150 302 with a 4speed OD trany. It got 11-12 MPG I was tired of the 302 and when IT let go it was replaced with a BUILT 460 and the granny low 4speed New Process. The Truck RIPPED and got 10-11 MPG. Trucks push a lot of air so don't think you can make significant changes. Hope this helps you! Tom
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