I6 mileage

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Jun 7, 2007 | 03:30 AM

#16

Jonas1022

Elder User

Joined: Feb 2007

Posts: 629

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From: DFW Metromess, TX.

"4 barrel 300 "?

What's your intake?

Jun 10, 2007 | 12:53 AM

#17

Slow

Senior User

Joined: Mar 2005

Posts: 297

Likes: 1

and remember that 9mpg to even 15 is a BIG difference.. 9 to 18 is double the mileage! That's quite a huge difference.

Jun 10, 2007 | 08:58 AM

#18

Olds4Life

New User

Joined: Feb 2005

Posts: 6

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i'm running an offy dual plane

Jun 10, 2007 | 08:59 AM

#19

Olds4Life

New User

Joined: Feb 2005

Posts: 6

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My Gallery has some pics, I did some carb adjustments yesterday as well as new exhaust last week. I'll put up some more pics and a vid shortly.

Jun 10, 2007 | 10:25 AM

#20

oft

Thread Starter

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Joined: Aug 2000

Posts: 597

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From: Burke VA

When I put the 351 in, I was thinking "fast" Well, the truck is fast but, like I said, gets real bad mileage. That was 7 years ago. I am not looking for fast now. Why do I need a 30 year old truck to be fast? I think the only thing I would really miss about the 5.8 would be that V8 sound.

Jun 10, 2007 | 11:20 AM

#21

havi

I'll have the Roast Duck

Joined: Jul 2002

Posts: 9,622

Likes: 109

From: Northshore, MN

are these all 2wd? I put a 300 in my 79 bronco, full time 4x4, C6 3.55 gears, and 32" tires. I'm lucky to see 13mpg at 55mph. But I blame it on the c6 and 203 tcase.

Jun 10, 2007 | 11:44 AM

#22

cjsteak

Senior User

Joined: Feb 2005

Posts: 158

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If it were my truck... I honestly wouldn't go through the hassle of swapping from the 351 to the 300. I love inlines and probably won't ever have another V8... but...

I'm also in favor of not working my butt off and losing performance.

I'd honestly work with what you have. Save yourself all the work and headache. Toss a decent "well tuned" 2 barrel carb on your 351 and keep the free flowing exhaust. If you've got a really high duration cam in it, drop an RV cam in it, or maybe one step larger at most.

You'll probably get a better throttle response with that 2V carb over the 4V and you'll still have the V8 sound you're used to.

Again, this is just what i'd do if it were my truck. You may enjoy the swap more than me though! Go with whatever you gut's tellin' ya.

Good luck with your project.