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Old 08-09-2012, 06:15 PM   #1
BigCountry62
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what to do to upgrade the 300 straight six

what would be the best decicsion as far as intake,carb,cam, and lifters. im looking for better performance and hp. also whats a good sounding exhaust to pair with the 300?
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Old 08-09-2012, 06:40 PM   #2
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The best option i would have to go with very first i mean top on the list would be going to the top of the page and putting in "straight 6 upgrades" or " 300 upgrades" or how ever you want to in the box next to search ,then click on search, and BAM!! A wonderful world full of answers...just sayin...
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Old 08-09-2012, 06:47 PM   #3
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well i did and they dont awnser the ?`s i have, theyre awnsers are all over the place, hence the fourm ^^
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Old 08-09-2012, 06:54 PM   #4
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The only upgrade that will give you what you want reliably is a V8. But you lose a lot of durability. The best thing you can do to an I6 is MAINTAIN IT.

But if you're shopping for parts based on the noise they make...
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Old 08-09-2012, 07:48 PM   #5
BigCountry62
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im not lookin for "noise" jst something to give it more pep and a good sounding exhaust, im new to the 300 and just lookin for advice
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Old 08-09-2012, 10:02 PM   #6
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As I recall, 300 I6's are torque machines. Doubt there is much you could do to get more "pep". The 300 inline is a great motor, take good care of it and it will take care of you.
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Old 08-09-2012, 10:48 PM   #7
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what year s your 300?

going to have to go away from fsb on this one
quick google

http://www.fordsix.com/
http://www.cliffordperformance.net/M...gory_Code=F300
http://www.ford-trucks.com/forums/10...nce-build.html
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Old 08-10-2012, 01:03 AM   #8
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...just lookin for advice
Maintain it - nothing else. Mine has about half a million miles on it (really), and I'm putting it into its 3rd chassis so I can keep flogging it. The first was wrecked so hard the engine ripped off the mounts & broke every accessory off the block; the 2nd got rolled, then driven for over a decade at ludicrous speeds on- & off-road. This time, I'm not gonna go easy on it.
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Old 08-10-2012, 02:48 PM   #9
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driven for over a decade at ludicrous speeds


In all seriousness though, there was an article in Bronco Driver awhile back with a writeup on performance parts for the big six... Not sure how to find it though
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Old 08-10-2012, 03:52 PM   #10
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its outta 77 high-boy
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Old 08-10-2012, 07:22 PM   #11
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It was either petersons offroad or bronco driver had that article. They claimed the 6 after their upgrades made 300 horse.
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Old 08-10-2012, 10:39 PM   #12
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For the EFI 4.9L 300's, there's really not a whole lot you can add to it that it doesn't already have. Crane and 1 other company(can't recall now) makes a computer compatible cam for it. Other than that, you're pretty much done. You can put in a 2.5" exhaust which is a minor upgrade from the 2.25 that's in it already. I did the 6Litre tune up and noticed nothing different. I replaced the rusted out factory exhaust with a full header back 2.5" unit and noticed no difference either. Mine is a '92 EFI engine that was very well maintained by the previous owner so if there was going to be any changes from what I've read that would gained me anything, so far they haven't worked.

Over on Ford six, you can find people who put in $1000's of dollars in order to get serious HP/Tq. It's only worth it if you truly love the 300's like some of us do. You could easily spend much less on a V8 to get more power.
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Old 08-10-2012, 11:26 PM   #13
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Over on Ford six, you can find people who put in $1000's of dollars in order to get serious HP/Tq. It's only worth it if you truly love the 300's like some of us do. You could easily spend much less on a V8 to get more power.
i love my 300, but for that amount of cash, why not go from a inline six gas to a diesel 5.9?
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Old 08-11-2012, 01:16 AM   #14
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its outta 77 high-boy
efi exhuast manifolds from an 86-96 is a good upgrade, then the chevy rockers to my understanding

if off-road i would run a motor craft 2bbl carb, or convert to efi, or if it was f.I id would say give it to me and ill give you my 5.0

if you start doing a cam (or even the chevy rockers) you going to have to upgrade the valve springs

i don't know if the efi head is better than the 77 but i would probably swap one of those on it and port and polish it

but all depends on your budget, a 300 i6 is going to be more to build than a 5.0 or 5.8
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Old 08-11-2012, 01:33 AM   #15
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Alaskan hit it. EFI exhaust manifolds and Chevy rockers (Chevy Inline) EFI would be best IMO. Just apreciate the Six for what it is. A strong, indestructible engine.
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Old 08-13-2012, 12:21 PM   #16
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The 300 is a great engine in stock form, but there ARE performance parts for it.

However, 90% of them are for the carb'd engine. The fuel injected computer doesn't take too well to mods.

The 300's biggest issue is its inability to breath. The carb'd model especially. The carb, intake, head, and exhaust manifold was simply too restrictive for the amount of cubic inches the engine it.

For my 300, I have exhaust manifolds from a fuel injected 4.9, which is a great upgrade and flow way better than stock. There are also headers available, but they're significantly more expensive, and come with problems of their own. For a mildly built 300, the EFI manifolds are where it's at. Pair that with a 2.5" exhaust out the back. I have a turbo muffler on mine and really like it.

The 1bbl carb is also much too small. It's only about 190cfm, which doesn't let the engine rev much above 3000 RPMs. Clifford performance and offenhauser both make 4bbl intakes for the 300 that'll let you put on a nearly infinite range of carbs. A well tuned 4bbl should be able to get you way more power, plus nearly the same gas mileage as the stock 1bbl. Mine has WAAAY more power than stock, and I get 17 - 19 on the interstate and around 14 around town.


Just an intake/carb and exhaust is going to really wake that motor right up. But, if you want to take it further, port and polish the head to really let it breath. Then, you can pick a cam of your choice (a 260h is a common choice). Installing larger valves into the head will do a lot for it as well.
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