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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old 06-19-2012, 08:11 PM
matt mangano matt mangano is offline
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1985 F150 Inline 6 to 302 V8 Conversion

I have a 1985 F150 currently with the inline 6 cylinder and the four speed transmission. I had an offer to get a V8 302 out of a 1979 f150 and wasnt sure what all is involved with this conversion.... if anyone else can give me any ideas id love to hear all about it or even if it should be considered. I am just fresh into the older trucks and want to learn all i can about mine.
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Old 06-19-2012, 09:08 PM
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The mechanical side of it is not too bad....the electrical and emissions is a different thing. The ignition on your 85' 300 should be EEC. That 302, I'm sure has a 2bbl carb on it. Trying to get the ignition, computer and fuel system to work is the challenge. You would have to convert it all over to a DSII (which is not difficult and there are threads on here on how to do that)

For the mechanical, the bellhousing on the 302 and 300 should match. You may need a different flywheel and clutch, if the doner is not a manual.

You will need a different radiator and associated hoses
Exhaust
The accessories should come over with the 302 (PS, alternator, etc...)
If you have AC and want to retain it, that may be a challenge in getting the right brackets.

Overall, not a real difficult swap, but not straight forward either.
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82' F100 with 460. Wieand Stealth with Holley 750 and Hooker headers.
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Old 06-19-2012, 09:10 PM
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You will also need to check your local/state emissions laws as you will be modifying the original emissions equipment, which in some areas you will not be able to get away with. As for Federal Laws...that's a whole different story.

And welcome to the forum!!! Do us a favor and edit your profile and list where you are and tell us a bit about your truck.
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82' F100 with 460. Wieand Stealth with Holley 750 and Hooker headers.
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Old 06-19-2012, 09:58 PM
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X2 on what Kev said. However, why would you want to change? The 300 six is a workhorse, a real truck engine. The 302 is a high revving engine suitable for a lightweight car. The 6 makes very good low-end torque, which is exactly what a truck needs. The 302 makes little little torque down low - in stock form. Yes, you can get some torque out of it, but it'll cost money and even then it won't have the torque of the 6 where it is needed.
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Old 06-19-2012, 10:51 PM
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Also, you will have to have different frame mounts for the motor mounts to mate to. The ones for the 300-I6 sit on the engine crossmember, the ones for the V8's attach on the back side. The swap isn't difficult, but the gains you would realize moving to the 302 will be dissappointing, in my opinions.
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1986 F150 4x2 SWB, down for restoration.
408 Stroker, Edelbrock top end, FAST EZ EFI, DJM Dream Beams, 4-link coilover rear suspension, Ford 8.8 diff, 3.55 gears, Eaton posi....
A work in progress. http://www.ford-trucks.com/forums/11...-el-guapo.html
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Old 06-20-2012, 07:31 AM
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I just noticed you are in Ontario, Canada. We had a guy just a little while back having some problems, because they have "new" rules there that you will have to meet all the emissions stuff that originally came on the motor in 1985. He was going to have to replace his 86 302, with an older 289 because he didn't have all the emission stuff that came on the 302. I'm not sure if that would apply to you, but you should definitely look into it. It could be a deal breaker. Good luck.
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1986 F150 4x2 SWB, down for restoration.
408 Stroker, Edelbrock top end, FAST EZ EFI, DJM Dream Beams, 4-link coilover rear suspension, Ford 8.8 diff, 3.55 gears, Eaton posi....
A work in progress. http://www.ford-trucks.com/forums/11...-el-guapo.html
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Old 06-20-2012, 07:49 AM
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I agree with Gary, I would keep the 6 it is easy to work on, simple to maintain, hard working, and as tough a motor as you will find.
I have had three 300 6s, one 302, and now own a 460, all in this generation of Ford trucks. I had good service with all, but enjoyed working on the 6 more, just having more room under the hood makes lots of chores easier. Just my 2 cents, the 300 (stock) is no speed demon, but a true work horse.
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Old 06-20-2012, 07:59 AM
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A good 300 is hard to beat. There aren't a lot of upgrades, but there are some. You can upgrade with an Offenhauser intake, headers, small four barrel carb, and cam and have a nice little hot rod motor, that is not the usual run-of-the-mill V-8. Careful though, with the emissions police.
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Ron
1986 F150 4x2 SWB, down for restoration.
408 Stroker, Edelbrock top end, FAST EZ EFI, DJM Dream Beams, 4-link coilover rear suspension, Ford 8.8 diff, 3.55 gears, Eaton posi....
A work in progress. http://www.ford-trucks.com/forums/11...-el-guapo.html
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Old 06-20-2012, 09:15 AM
1986F150six 1986F150six is offline
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Quote:
Originally Posted by 86fordtruck View Post
A good 300 is hard to beat. There aren't a lot of upgrades, but there are some. You can upgrade with an Offenhauser intake, headers, small four barrel carb, and cam and have a nice little hot rod motor, that is not the usual run-of-the-mill V-8. Careful though, with the emissions police.
I agree with what 86fordtruck has to say and enjoy reading of the performance upgrades which he and others have done or are working on, but one can simply choose to embrace the 4.9L/300 for what it is... a simple and reliable engine with good torque and sufficient horsepower for a daily driver / sometime work truck and save a lot of money.
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Old 06-23-2012, 11:55 PM
matt mangano matt mangano is offline
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Thanks all to the threads given me alot to think about, as i said im new to all this and just learning about the truck and all the possibilities it has, i may consider leaving the inline 6 in her not quite sure yet. just had the engine given to me so thought id think bout it...
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Old 06-23-2012, 11:55 PM
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