I'm Building a 500hp 300 Straight Six

Talking about the next step for the turbo Ford 4.9 300 inline 6 F250. Taking a look at the Promaxx CNC ported cylinder head.

[@Yoder0441]

A man named Sherman Sligh back in the 70's had a 600+ horse 300. Dubbed boss 300. It consisted of six segmented pieces of boss 302 heads, late 60's castings. For a half day or more straight he heated these segments 1200+ degrees and brazed them together.(cast iron doesn't play nicely in welding). He epoxied the intake runners(they were too big), put a massive thumpstick and valtrain to complement(roller lifters, cam, two piece pushrods etc.), along with custom rotating assembly.(gas ported forged pistons, alimunum rods,) Ran a 9.2 second qtr mile, vehicle type I have not found. N/a build. He mainly stuck to circ racing, eventually being banned. Even won indie by 2 seconds but didn't count as official record due to ban. Early 70's. I've a 300 myself, great engines.

[@larrynorsworthy8582]

Damn 😮

[@gregbloodworth6000]

I saw that very engine in a video on KZbin not too long ago.

[@rhubarbpie2027]

kzbin.info/www/bejne/gKLNmax4gMZnpqssi=rebXAOBKHW36-nIy Here is the video of the Boss 300.

[@johngulbunny8652]

3 heads,not 6

[@gregsammons6144]

Your truck looks and sounds incredible! Cant wait to watch you continue on this build.

[@jmyers8298]

Dale yeah. I’m gonna stick around for this. Good luck man.

[@TheTurnerFarm]

As always the truck sounds amazing. Good luck on the build.

[@terrycarter8929]

Updated ..I found a company that has roller cam compatible gears( i ordered 2). Also DSS Racing now makes forged pistons and molnar makes hd rods. Working on the roller lifters now.

[@blacksheep4001]

I ended up going with some BBC H-Beam con rods, just a very light trim on the crank. I went with the longer, bigger pinto valves. Waiting on the machinist to finish the head to find out what pistons I need built. And yes H.S. rockers 👍 shooting for 600hp but will see, I'll probably push it until something breaks then build another even stronger. I'm a fabricator so I might just do the chopped up head eventually

[@nicksommerlot3933]

Ford FE pistons and rods work. You can get them forged. Power nation did a boosted 300 with that setup

[@70sport37]

Cool truck and power plants good luck and find a rollbar don’t see them anymore

[@terrycarter8929]

I have been working on a roller cam. Only issue is the distributor gear. I can't find anyone to cut a steel compatible one. You can take the bronze one and throw it into the trash. I don't want to replace it every 3 months!

[@Fordman7575]

What year is the replacements engine? Just to let you know the stock connecting rods are forged. All 240/300's came stock with forged rods. If you don't want to go aftermarket rods you can just add some ARP rod bolts and have the rods polished, shot peened and balanced. The early rods 1965-67 were slightly stronger because they didn't have the oil squirt holes. And they also had the smaller .912" piston pin diameter ( same as the SBF V8's ) . Which would allow you to run stock compression height forged 351W pistons. The later rods 1968-1997 have the .975" piston pin diameter. You can still run the 351W pistons but would need to have the small end of the connecting rods bushed down. If you really want forged pistons the best bet is to just have a set made. That way you can have them built to best fit your exact build. AutoTec are a good choice for custom pistons. You probably know this, but that cylinder head will also require push rod guide plates and hardened pushrods.

[@johnshaff4834]

Molnar rods!!! And bore to 4.050 like you said and run 390 forged pistons. And Isky makes a turbo cam

[@raystevens687]

Edelbrock makes ahead for your engine

[@ebinmaine]

Do you have a link for that?

[@jeffreyhansen1479]

Always claimed ford missed the boat when they stopped at the 2300 with the turbo......

[@almartin3283]

I was told some time ago you can use 352 pistons and rods

[@almartin3283]

351 W pistons and rods

[@chikendagr8994]

I don't know how much it costs but Wiseco will make custom forged pistons and I've seen someone else on youtube order some custom forged 300 pistons from them so that could be an option.

[@stephennickles7389]

Got a 300 i6, sure am curious

[@Krunch2020]

So? The Honda S2000 makes 120 hp per liter. For a 5 liter that’s 600hp and passes smog and was available at the dealer with warranty.

[@WastedPaycheckGarage]

Yeah but it’s also a Honda. And how much torque does that have again? 162 lb-ft? At what rpm?

[@cubapoo845]

hey what did that head run you? im looking to buy the same thing but it seems the cnc ported head isnt on the website? thanks!

[@gemk9477]

1400

[@micwell2247]

Will it run on pump gas ?

[@hunterswiski8398]

Any updates on the build?

[@WastedPaycheckGarage]

Unfortunately nothing to update on right now. Slowly collecting parts, luckily since I’m moving so slowly DSS came out with forged pistons specifically for the 300 before I ordered other ones. I may have found a local engine builder to do the machine work for me/help me assemble a good combo.

[@ikesquirrel]

My brother kept talking about building one to 600 hp. I thought he was full of bs until I went over to his house last week and saw it on the engine stand. He's serious.

[@Joe-hz1nw]

I like how much of a lunatic your brother is 😁

[@daumination247]

Sounds like a P51’s Merlin at idle. Lookin forward to what it’ll do!

[@PaulThomas-qo9vy]

Yes! Sweet Horse Pressure! (More Boost, & more head & cam!) That Power Nation 300 turbo build was an eye-opener & inspiration for us 300 I6 owners! We look fwd. to your new adventure!

[@WesP73]

I know I comment on your fb post already, but the DSS 390 ford pistons for the extra $80 to get the custom bore size so you're not stuck with a 0.050 overbore is by far the best route. Same pin size and compression height range. Those along with the Molnar 300 rods you're set with a good balance job. Looking forward to your build progress, hopefully will have mine running soon also

[@terrycarter8929]

they make them stock 300- 4.00 bore ,.030, .040 and .060 overbore now

[@customafd248]

Hopefully you give us all the information possible on this build. So someone like me can replicate it.

[@Nick-ck5mk]

Hell yeah love the 300

[@dheujsnrhfydhehehshshhdggsd]

This is my same dream project!

[@dustinontaiyabbi5608]

There is an 87' f350 of latbed dually with a 4.9 300, and it's begging to be built.

[@Theupstateidiots]

Theres a guy that just did an LS headed 300. Big advantage to that is intake and exhaust not being on the same side. Good luck with your build man. Looking forward to it

[@NautilusGuitars]

Other people have said it, but I want to reiterate that you can use 390 Pistons instead of boring that much over. It's the best bet because the geometry matches up perfectly and you can keep[ your compression ratio up without creating even more work. I'm doing a very similar build for my 65 Mustang, so I'm excited to see what you come up with here!

[@bobadingo]

Is there something wrong with just ordering the correct size Pistons'?.. .

[@Freedomishere-im6ug]

The 300 has 2 different wrist pin sizes 390 is a common piston for the 300 builds The build we are doing running 351w pistons

[@NautilusGuitars]

@@bobadingo Not if you're building a bone-stock engine. He's building a 500HP 300, as the title of the video states. Stock pistons aren't going to handle that much power or compression. Obviously there's a reason to not use the stock pistons.

[@NautilusGuitars]

@@Freedomishere-im6ug Sweet! Always happy to see the 300 getting the love it deserves. I think it has the potential to be a bit of an American 2JZ if enough people start building them and getting the aftermarket incentivized to start producing more parts.

[@Freedomishere-im6ug]

@@NautilusGuitars are saying was it a fordjz

[@TheBigford460]

I have also picked up a spare engine. Thinking about doing something similar. Who did the head for you? Thanks

[@ebinmaine]

Search "Promaxx CNC"

[@everettstormy]

Damn I wish mine was 4x4. I just really have a hard time finding the motivation to build a truck that's not 4x4. I could build it, just to keep up with a modern f150 I guess but idk.

[@trashman1694]

You can swap 4x4 parts onto a 2wd truck

[@everettstormy]

@@trashman1694 I've heard that takes such time ans money it's not worth it.

[@BigBadMarketer]

I had a 300 1996 with the automatic 4x4, I put a level and 33s on it. Mileage went down it got down bad enough that I could not enjoy it anymore for a daily. I think a 2wd is more badass, its 400 pounds lighter or so more power n mileage, less maintenance… All desert trucks are 2wd. Sold that truck now I might trade this chevy for another one its 2wd 5speed stick! cant wait to build it up!

[@everettstormy]

@@BigBadMarketer yeah, thats cool to hear. I have a 97 pathfiner 4x4. Thats my off roader now

[@trashman1694]

@@BigBadMarketer You should have regeared it for the 33s and that would have helped a lot

[@joeclark9042]

Well I know this has been a year ago very good video and I got to ask you a question brother if you can remember where did you get those gauges at what kind are they good looking truck

[@noahpelletier3871]

Would love to hear you rev it up to 4500 for a minute or so; really hear it singin

[@nowaykets4336]

Love that motor just sold mine today sad to see er go honestly

[@Freedbird]

Looking forward to this.

[@williamtillman8489]

Love the truck an new project bro.

[@Project-gr6zy]

Make sure you run a cam with the same profile for exhaust and intake meant for a power band of around idle to 5500 then size your turbo around 58mms to punch 500hp around 5k rpm with good tq in the mid low range

[@longshotdiedtired1582]

Straight power !! Pun intended 😂

[@genegriffith1141]

Okay where’s the engine build video? What did you use for rockers and push rods? Thank you.

[@WastedPaycheckGarage]

Block is still at the machine shop. Going to use Harland Sharp roller rockers. Haven’t gotten to the pushrods yet

[@LeeChappell-zj3uv]

What kind of gun is on the bench behind the head .

[@thomastessin1663]

Can smell your exhaust leak from here.

[@ktmcc4360]

The most bomb proof motor Ford ever built. I had a 1980that ran over 500k. Abused by apprentices that got a free truck. U joints and breaks was all it cost over 25 years.

[@jamescarter1500]

Best engine to ever come out of Detroit. Keep water and oil in it and beat the crap out of it cause she will take it and keep on coming. I bought one once suppose to been blown up. 32 dollars worth of rocker arms and push rods I drove it for years

[@raginroadrunner]

You need to use the industrial version. Steel crank, big rods and steel cam gear.

[@TheLionAndTheLamb777]

7 quart pan too many times.

[@gaigegourley7896]

If I remember right you can ford forged pistons that fit a 390 in those. Motor trend did it on their build

[@gaigegourley7896]

Power nation *

[@Hollywoodhouse74]

Only way an inline six cud keep up with with other engines is put a turbo on it

[@riogrande163]

found the v8 boomer

[@juliej4111]

Where did you get the head work done? Are you going to upgrade the pushrods?

[@WastedPaycheckGarage]

The head is offered by Promaxx. Planning on chrome moly pushrods

[@nathanhale7444]

I'm buildng one too. A 92 f150 fuel injected 300/4.9 with port matched Bosch Injectors, summit racing cam and It's a 5 speed manual and 4x4

[@caryd67]

That pin/bolt that your door latches to: cut a little piece of air line about an inch long, split it lengthwise, and snap it over that latch pin. Your door will latch like brand new.

[@WastedPaycheckGarage]

I actually just snagged a piece of 1/2” pex water line from the farm a few days ago to do exactly that, just haven’t found the time to put it on

[@caryd67]

@@WastedPaycheckGarage oh, Pex! Good idea… I just wonder if it’s too heavy walled.. the OD is as important as the ID.. but I’ll definitely follow you and see how it works ✌🏻 PS beautiful truck, I absolutely love the 300 sixes

[@dennisblackburn7416]

Btw your truck looks and sounds really cool!!

[@Bullnose81]

It’s June bro. Any progress???

[@WastedPaycheckGarage]

Yes. I just picked up my forged rod and piston short block from the machine shop about 2 weeks ago. Video coming soon

[@jasonlemon7362]

What part of michigan? I am looking to build a turbo 300 for my 71 bump side.

[@Sundayhandwound]

Is there a strong reason not to go with forged FE pistons as in the Powernation build? I’m running the aussiespeed 2bbl intake, EFI exhaust manifolds, Holley carb right now. Thinking of doing a swap for an industrial 300 turbo/sniper build.

[@joshjones3408]

I thank 305chevy connecting rods&piston with a little work ...I stayed at a holiday inn😮

[@BigBadMarketer]

Nice truck love the sound clips! Q; what size exhaust you got?! Thinking of building myself a n/a 300 with those cnc promaxx heads I wish they had some in alluminium. Any other parts u recommend for a maxed out n/a 300? cheers!

[@charlieplunkett9748]

What's that cluster gauge?

[@terrycarter8929]

Icon FHR Series, Forged Pistons, Ford SB 331 Flat Top, 4.030" Bore, 3.250" Stroke, 5.400" Rod Item Number: UEMIC9970-30

[@ga_teg]

Do you have a full write up on this? Currently looking to build my grandfather's old truck up

[@amjrpain919]

Nice Pickup, young man!👋😏👍 🇺🇲F O R D E V E R!🇺🇲

[@terrycarter8929]

Oliver Big Block Series Connecting Rods C6800SMBB

[@derekdoble4438]

Power Nation used 390 pistons on their buzzing half dozen

[@terrycarter8929]

Do you have the part numbers for the valve springs and valves? I really want to use Beehive springs.

[@bennyb.1742]

Hey did you get the Sniper to control ignition and if so, how?

[@VigilanceTech]

Didn't the aussies make a crossflow head for that?

[@Go4BrokeOffroad]

Love seeing your set-up. Old dentists all deserve turbos

[@terrycarter8929]

I have two 3.9L cummins turbos to feed it. I need to buy that head.

[@terrycarter8929]

Re bush the pin ends and have the crank rod journals turned to SBC journal size.

[@gemk9477]

Autotech pistons $550 custom forged

[@buckjank]

Dude you got a head with the holes for fuel injectors

[@DawsonMoore-qh7ut]

Hey can you put links to the stuff to efi swap the 300i6

[@robertwoodward388]

I built one put a 240 head put 351 Windsor pistons balanced every piece line bored it great motor 5.0 mustang didn't have a chance

[@Freedomishere-im6ug]

Are build also do 351w 👍

[@bobobrazil1973]

Like them 3 hundies.

[@henrychavez918]

Keep me updated..!!!! Have the same block

[@Freeman-eo2lx]

sounding good for a ford at idle your doing something right

[@dennisblackburn7416]

I have a Ford 300 motor, I want a new head. Would you mind letting me know where I can buy one like yours? And with the head accessories?

[@WastedPaycheckGarage]

I ordered the head fully dressed from Promaxx. They don’t list it on their website

[@grayrecluse7496]

You need to fix the door paint first.

[@WastedPaycheckGarage]

Agreed

[@grayrecluse7496]

@@WastedPaycheckGarage Must have had them off, when you painted them.

[@alanschroeder3049]

I heard 390 piston work

[@j.e.d.8065]

Get custom pistons from race tech

[@bencarignan2711]

Boost overcomes all.💪

[@Kamwi_003]

I see most of an SKS there too!

[@BricknoseRob89]

Do you happen to have a parts list?

[@TheOscaryuriar]

What head are you using?

[@workingcountry1776]

New sub.

[@jamestupper5599]

Where did you get the head from?

[@AnthonysResurrectionGarage]

Awesome build!!

[@JarredHarvey-xf9wx]

Dam she sounds good omg

[@dustinparks1958]

What tuner is that?

[@makinbac0n]

Envy!

[@joshuaflowers736]

FYI: "cold start" doesn't refer to the temperature outside, it refers to the relative temperature of the engine. it could be a humid 103 in Louisiana and if you haven't run your engine for the past three days, it is still referred to as a "cold start." And damn those mains are clean!

[@steveanthony4695]

where did you get the head

[@ebinmaine]

Promaxx