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Ford Truck Club Forum > GARAGE TALK > Garage Talk: Engine & Drivetrain



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  #1  
Old January 7th, 2012, 05:53 PM
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Default 300 I6 Engine swap

So I've decided for the Bronco on a 300 I6 engine swap before the engine goes in I'm going to pretty it up a little bit and do the exhaust modification to it. I figured I'd start this thread for the chronicle of when it begins.

These are in no particular order:

The plans are to buy a 300 clean it up and go over the engine and install all new gaskets(IE: Head gasket, Valve Cover Gasket, oil pan gasket), pull the one piece exhaust manifold and swap on the 2 piece EFI's(for better exhaust flow), probably do a carburetor rebuild(eazy peazy lemon squeezy), tune-up, oil and filter change, paint the engine..

Then I'm going to get 4x4 300 engine mounts, a 300 flexplate(for my c6), warranty my starter so I can get another good one, pull the 351w out and clean it up, while it is still in the Bronco I'm going to drain the oil, break the oil pan bolts loose, pull it, take off the pan, clean the pan off and out and paint it, scrape the old gasket off, put on a new one piece gasket(this'll be the last gasket it needs), reinstall the pan, then degrease the engine and paint it, I'm still undecided if I'm going to sell it or keep it I'm leaning towards keeping it(be cause it is such a good running engine).

I'll probably be asked "Why do you wanna pull the 351w and swap in a 300?" well my answer is, I'm looking for better gas mileage and I've got a running bet going that I could make the Bronco hit 20 MPG's even being a 4x4. I may even go for the Sixlitre Tune-up as they can be done on the 300(just don't know if I wanna pony up for the expensive $h!+ that the tune-up calls for.
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  #2  
Old January 7th, 2012, 08:43 PM
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I belive you'll be hard pressed to hit that 20 MPG mark


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Old January 7th, 2012, 09:06 PM
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The only one I've ever seen a buddy of mine has and he gets worse MPG than my 302. It doesn't run as good as my 302, and has a lot of issues in general, so it's not a fair comparison really. This will be an interesting swap either way.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


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Old January 7th, 2012, 10:43 PM
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Well. Do as you please.
But you ain't gonna hit 20 mpg with no slant nose bronc with a carb'd 300 and a c6
Last carb'd 300 with a t18 I kept track of mpg on got maybe 14
The 300 is capable of great mpg in a perfect condition with perfect gearing/tire size/ trans rations etc.. but you can ruin it real quick.
Go over 55mph, done for. Lay the hammer down stop to stop, done.
Do as your heart desires, I'mma just sayin.
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Old January 7th, 2012, 10:54 PM
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I was getting 18mpg's in my bricknose 88 4x4, lifted 6", 31x10.50x15's, 300 I6, M5OD, 3.55 gears, extended cab shortbed, never drove it above 55mph(and don't in anything we own unless I'm either pissed at another driver for cutting me off or I just feel like romping on it).

Either way, I'm going to swap the 300 in after everything is done, fill the tank up and hit for as high as I can get, I'll aim for 18 and call anything beyond that sheer luck.
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Old January 7th, 2012, 11:01 PM
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Lifted 6 inches with 31's. Yowza. Got pics?
Good luck with it.
I can easily stoop over 20 on the highway, if it's not uphill, I stay at 55 (which will never happen :headbang: ) and if I can keep it in fifth a lot.
Really though, it don't bother me runnin 75 in fourth at higher rpms, I got a truck and it gets truck mpg. Whatevs.
Not my thread, I'm done. Have fun
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Old January 8th, 2012, 12:20 AM
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Yea, that c6 is gonna kill ya on the MPGS, but it'll be better than what you have now I'm sure.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


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Old January 8th, 2012, 01:40 AM
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Ken - you gonna get the seperate after market intake and exhaust manifiolds?

I seem to remember they made my life easier on MPG, HP and Tuning.



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Old January 8th, 2012, 11:32 AM
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Quote:
Originally Posted by big_blue79 View Post
I was getting 18mpg's in my bricknose 88 4x4, lifted 6", 31x10.50x15's, 300 I6, M5OD, 3.55 gears, extended cab shortbed, never drove it above 55mph(and don't in anything we own unless I'm either pissed at another driver for cutting me off or I just feel like romping on it).

Either way, I'm going to swap the 300 in after everything is done, fill the tank up and hit for as high as I can get, I'll aim for 18 and call anything beyond that sheer luck.
you were getting a false reading due to oversize tires and no recalibration of the speedo

at your 55mph, you were in all reality going 63mph
an easy check would be to go down a road with mile markers and so as you pass one record the odometer reading, now drive for 20 miles and you will have clocked up 21.5+ miles


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Last edited by JSoko; January 8th, 2012 at 12:40 PM.
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  #10  
Old January 8th, 2012, 12:27 PM
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Quote:
Originally Posted by HawaiianF150 View Post
Ken - you gonna get the seperate after market intake and exhaust manifiolds?

I seem to remember they made my life easier on MPG, HP and Tuning.
No, I'm just getting rid of the "Log" style exhaust manifold(one piece) and installing the EFI (2 piece) exhaust manifolds. They flow better than the log style but I lose the heat riser in the exhaust(which really isn't a problem), from there is two choices for a little better MPG either a one piece exhaust system in about 2 1/4"-2 1/2" diameter or a Dual exhaust in about 2" diameter.

I know that the c6 will hurt MPG's it's going to be coming out anyway, I'm also going to swap in a Np435 later on down the road I've just gotta find a 4x4 tranny, all the linkage, the steering column, the crossmember, the floor hump, and a driveshaft.

I don't have anymore pics of the 88 but I will say the reason I don't have it anymore is 1: it was lifted by some backwoods haggard redneck and the dumb dumb used blocks to attain the lift(found out after I took it to get an alignment) and 2: my mom couldn't get in and out of it because of the height so I sold it to some girl from up around the Kansas border so she could pull the engine and put it into her truck(which is another story in itself).

Anyway I know I'm pushing it trying to get even 18 mpg's with the auto tranny in it, but I'm hoping it'll get better mpg's than what it's getting now.
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