300 6cyl in a 70

Engine, transmission, transfer case, axles.
Suspension, coils, leafs, mods, upgrades.

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jack70
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300 6cyl in a 70

Post by jack70 » Sat Jan 24, 2004 12:43 am

Hey all, finally got the 300 in my 70, still working out minor stuff, but it fits.
Attachments
Tranny, Transfer mount.jpg
added trany mounts from my parts rig so I could move it all back
Tranny, Transfer mount.jpg (49.18 KiB) Viewed 20251 times
300 6cyl Right side.jpg
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300 6cyl rh mount.jpg
had to move the mounts out 3/4in, and forward 1 1/2 in
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300 6cyl left side.jpg
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300 6cyl clearance to rad support.jpg
lots of room for my radiator
300 6cyl clearance to rad support.jpg (49.14 KiB) Viewed 20251 times
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Post by jack70 » Sat Jan 24, 2004 1:22 am

Here's some more
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Tunnel Cover #3.jpg
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Tunnel Cover #2.jpg
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Tunnel Cover # 1.jpg
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Tunnel Cover Removed.jpg
Built a removeable tunnel cover, a couple of years ago when I installed the 435, without a body lift
Tunnel Cover Removed.jpg (55.27 KiB) Viewed 20251 times
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Post by RichieSanders » Sat Jan 24, 2004 7:23 am

Jack,
That looks great! I bet you're gonna love all the torque that 300 six will make. You can probably get side jobs pulling stumps or moving houses off their foundations. Seriously, that's some good work and I'm sure you'll enjoy it. Keep us posted.

Richie Sanders

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Post by rjlougee » Sat Jan 24, 2004 5:25 pm

Very nice. Are you going to leave it carbed? I swapped an EFI 300 in mine, it looks like this:

Image

If you plan to wheel it hard, you might consider moving the engine down in the frame. I dropped mine 2.5" in the frame rails.
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300 6cyl

Post by jack70 » Sat Jan 24, 2004 10:36 pm

Joe, right now I'm not planning on efi, but who knows, a year ago I wasn't planning on a 300. The concern I have about dropping the engine any lower is hitting the pan on the front diff. Later
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Need More Info Please!!

Post by BRONCOMAN72 » Wed Feb 04, 2004 4:12 pm

I have been pondering this swap for some time. I didn't think the 300 would fit, but I never got the cahnce to measure one up. Is a body lift required?? Joe, I noticed you have made some major firewall mods. Was this required to clear the EFI intakes? Are there any other clearance issues I would encounter? Any info y'all could provide would be greatly appreciated! :thumbup:

Thanks
Mike

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Post by Gummi Bear » Wed Feb 04, 2004 5:17 pm

That is just awesome! I like to see that you guys are also believers in the good ole 300 (been around since something like WW II) Dad had a 7 yard dump truck with a 300 in it, sure was cool, and still had gobs of torque. My next rig will definitely sport one, EFI of course. I don't think it will have any problems at all turning the D 60's with 40" tires I'm planning on. Sure, it's ages away from beginning, but you can never start too early! (I promised the Mrs. a larger house, with acreage so she can have a horse, and I can have room for a proper shop before I start another Bronc) Good work guys, and keep us updated on yer progress, I'm excited to see how it turns out.
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Post by jack70 » Thu Feb 05, 2004 11:59 pm

If you guys would send your address, I will reply with all the notes and info that I have so far. My 300 is carbed so I don't know about the efi. Later.
Jack
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Post by Gummi Bear » Wed May 05, 2004 12:29 pm

**blows dust off old post**


Update?

How did it turn out?

How is it on the trail?
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Post by rjlougee » Fri May 28, 2004 12:32 am

Also blowing dust off old post.

I did make some significant changes to the firewall, but they weren't related to the engine install. I did it because I cut the front end off and built the shelf (where the heater used to be) so I could put a pair of batteries there.

I haven't gotten enough time on the trail in mine to give a good opinion. I'm gone from the house much more than I'd like (in fact, I'm overseas right now). I will say it's pretty good on the street. A buddy has a MAF 5.0, 4.56 gears and 37" MTs and these are pretty close in a straight out drag down the road. (mine is the 4.9, 4.88s and 38.5" SXs) I'm maube a second behind on 0-60 MPH.

As far as torque, just shifting into drive (at idle) will chirp the rear tires, unless I'm totally off the brake, in which case it starts moving immediately. I also don't have a NDS in it, so it'll start right up in gear and take off if you're not careful.

So far I'm really happy with the engine. The only bad part is the weight. I was trying to keep the trail weight under 3500#, which I didn't quite make. It ended up being about 3700#, including tools, full fuel tank, extra parts and spare tire.

Jack just got his on the road and should be responding soon as well.
Joe

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Post by rjlougee » Fri May 28, 2004 12:45 am

Forgot, here'a a pic. This is the driveway paint job, flares, etc...

Image

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Post by rjlougee » Fri May 28, 2004 12:45 am

Forgot, here'a a pic. This is the driveway paint job, flares, etc...

Image

JunkDriver

Post by JunkDriver » Fri May 28, 2004 11:00 am

Bastard!! LOL NICE!!

Just what I needed, another project in my head for future considerations. Its already full up there.

A nice easy on fuel truck sure would be nice instead of these HP hungry engines I like for once.

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Post by jack70 » Fri May 28, 2004 1:20 pm

Joe, looks good.
I took mine up on the hill for a little test drive, on the road where I was in 3rd with the 302, I was able to use 4th and still making power. On the dirt road, about a 30% grade, 1st gear high range, stepped off the clutch and walked up it at about 500-600rpm. I've got it back in the shop, reducing the thickness of the fan spacer to move it back from the rad. Am going to try to get up tomorrow on the mountain and play. Btw, I'm running a Clifford intake and header, with a 500 Holley, still don't have it jetted quite right but it's coming. Later
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Post by jack70 » Sat May 29, 2004 10:13 am

We ended up going on the mountain yesterday. Playing on 6ft snow drifts. The 300 is awesome, I was crawling up on drifts where I used to use throttle to get there. Now I have to learn how to drive the Bronco all over again. Staying out of the throttle and useing the torque to get me there. We were gone about 8hrs, and I only used a 1/4 tank of fuel, temp guage never got over 180. 6 months and a bunch of work turned out to be everything I wanted out of this swap, and a whole lot more. Later, Jack
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300 6cyl in a 70 Bronco

Post by jack70 » Sun May 30, 2004 1:03 am

Got some more pics of the end result. Won't have the York A/C installed til I get home from AK in the fall.
Attachments
Mvc-005s.jpg
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Mvc-002s.jpg
above left
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Mvc-001s.jpg
300 above front
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Post by jack70 » Sun May 30, 2004 1:12 am

Here's some more
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Mvc-009s.jpg
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Mvc-006s.jpg
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Post by jack70 » Sun May 30, 2004 1:14 am

this is the last for now
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Post by Tom Dummer » Sun May 30, 2004 11:48 pm

If you need to get some off-road testing done, I'll be glad to take that thing out for a spin. Just one of the few things we Bronco brothers do for each other. Now wheres the keys?

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Post by jack70 » Mon May 31, 2004 12:10 am

Damn, you'd do that for me, what a guy. thanks but I got the testing covered. I think though that I will take the keys with me to AK this summer to keep my wife out of it. She might like it too much.
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Post by Tom Dummer » Mon May 31, 2004 8:32 am

Its OK if you take your keys, I'm a hard core helper and I insist on helping, so I'll just use one of the old Ford keys I have laying around here.

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Post by Roger » Tue Jun 01, 2004 8:04 am

Congratulations. Very nice swap. Have you got any more pictures of the firewall mod's and clearance's?
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Post by Roger » Tue Jun 01, 2004 8:41 am

Congratulations. Very nice swap. Have you got any more pictures of the firewall mod's and clearance's?
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Post by Gummi Bear » Tue Jun 01, 2004 1:44 pm

Jack,

If for some reason Tom falls through on you, I'd be willing to step up. :thumbup:


I'm really impressed with how clean the install came out. It looks great, and sounds like it runs well, now how about some trail reviews?

It's my goal to start looking for a new rig this winter to start building up a dedicated trail rig (I want it to look a bit like Joe's) with big wheel openings and low COG, open air, and a full cage.

Nice work, I look forward to seeing what else you guys have to offer, tips on install and trail stories (with PICS!)
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Post by jack70 » Tue Jun 01, 2004 10:40 pm

Thanks guys, it's been a lot of fun and hard work putting it in. I didn't do any firewall modifications. I moved the tranny and transfer case back 3", I have about 1/2" between the firewall and the back of the head. I do have fan clearance issues, only about 1" to the rad, don't know yet if I'll go to a thinner rad or move it forward, It's the stock rad. In the snow last friday I was idling at 400-500 rpm up on 6' snow drifts, using torque instead of throttle. Really enjoyed it. Later, Jack
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Post by jack70 » Thu Sep 16, 2004 11:03 pm

These are some of my notes and the reasoning behind me doing this swap. Start to finish on this swap took about 6 months, including rebuilding the 300 before I started anything else, but I was also working 350mi. away 4 days a week. And some weekends were spent on honey-dos and with my son.
I was trying to get this swap to look as "factory" as possible, and I'm also pretty anal about my fab work, so some details took a lot longer than if a person was to cut corners on the fit and finish. I am real happy with the way it turned out.
On to the best part, driving. I don't drive a lot on the street, just around town (pop. 650) and am only two miles from the dirt to the mountain, but it has the balls to put it down the road at 65+. In low range with 4.11s and 33" tires it will crawl. have walked up 6' snow drifts at 2-300rpm. It really wants to lug down and pull like a tractor. Most of that day was spent in the 4-800rpm range. Quite a bit lower than with the 302.

I was tired of the 302 stumbling at 600rpm, overheating in the snow, and no room under the hood.
I bought a complete 300 6cyl from the wrecking yard, bell housing to fan blade, with alternator, ps pump and York air compressor bracket.
I picked up a second block and pan to use as a mock up block so I wouldn't have to fight the head, or scratch the paint, (lol). The 300 fits in the engine bay but with the water pump and fan on there is only about 1in of room for the radiator. That's when I decided to move the whole thing back. Three inches is all I could get going back, unless you cut the firewall, I didn't. To move it back 3" I had to install a 2" body lift to clear the bell housing at the firewall.
A few years ago I made a removable tunnel cover when I installed the NP435. It made it nice for this swap, I didn't have cut a big gaping hole to move everything back.
I had another frame that I robbed the transfer case mounts off of and mated those to the ones in mine so the cross member would just slide straight back. I put a jack under the tranny and with the engine hoist on the engine was able to line up and level the engine where I wanted it. Once the cross member was bolted down, I moved on to the motor mounts.
The 300 is out of a 81 pickup. I used the stock motor mounts. The frame mounts were too narrow and too far back. I cut the hard mounts off the frame using a die grinder, then bolted them up to the block and set it back in. I trimmed about 3/4 "off the mounts so they would sit out wider on the frame, set it all back in and tack welded them in. They ended up about 1 1/2" forward and out 3/4" from the stock position. The oil pan hits the front cross member in this position. I cut out 1 1/4" and then laid in a piece of 1/4"plate. I ended up with about 3/4" to 1" of room between the pan and the cross member.
The power steering pump that came with the engine sat too low, the pulley hits on the ps box. I took the brackets off and re fabricated them so the pump would sit 1 1/2"higher. Doing this required some trimming on the York air compressor bracket so it would mount up. I had the ps lines made, the 81 pump to the 76 ps box was a pain.
The clutch linkage had to be fabricated. The down rod from the cab needed to be 2" longer, the mount on the engine for the bell crank had to be extended 3", and the push rod to the clutch fork was extended 3". If you use an automatic this wouldn't be an issue, but your shift linkage would have to be extended.
Even with the 2" body lift, there is a hood to air cleaner clearance issue. Using the stock intake/exhaust, spacer plate, carb and air cleaner, the hood lacked about 5" of closing at the latch. I ordered a intake and header from Clifford Performance to run a 2 brl carb. It is a little shorter than the one brl that came stock. With the intake, spacer and carb on, I set the K+N filter on, the top of the air cleaner is about the same height as the top of the fire wall. My K+N is one I picked up some years back to fit on the top of the 302. It's about 14" and the bottom has a real deep recess to clear the carb and not hit the hood. I'm running a Holley 500cfm that I've put a spring loaded needle and seat and also a whistle in the top of the bowl to stop the flooding. I still don't have it quite right, am going to try smaller jets. This carb is mounted sideways from normal, turned 90 degrees, so the throttle cable makes a smooth curve. Mounted normal would necessitate a S curve in the cable
The split header from Clifford is for a full size pickup/bronco. The front header dumps out right behind the motor mount. The rear header dumped out right on the frame in front of the starter. I sectioned it just above the collector and moved it inboard. I made a two into one collector for my single exhaust. Using the collectors that came with the headers and another set from the parts house, I made this piece removable to service the starter.
Both drive lines had to be reworked. The front about 3" longer and the rear about 3" shorter. I didn't measure for them until all mounts were set, and the engine in place.
The exhaust is finished, single, with a dump right behind the axle on the right side. I used an oval generic muffler that had the in and out where I wanted them so the muffler would stand up between the drive shaft and the frame. Lots of clearance.
I used the stock 302 radiator, bottom hose is 302 lower, with 3/4" cut off both ends. Top hose is 300 upper, with 3" cut off engine end. I ended up with about 1" clearance between the fan and radiator. I still need to modify the shroud and install it.

The 300 had a 10 1/2" clutch, I wanted to run an 11". I used the 302 flywheel, but had to have the factory imbalance machined off. A 300 out of a 3/4 ton pu may have an 11", but I didn't try to find one.

As with any swap of this kind, you will run into all kinds of little set backs, I like to think of them as challenges for my brain and fab skills.
One of the other things I did was start a notebook just for the bronco. Divided into categories engine, tranny, axles, etc. I list any and all parts and what they came from, so down the road I know what I want at the parts house. It's a 70 Bronco, 73 Dana 44, 72 1 ton 435, 81 300 6cyl, 87 tilt column. When I get it done I will be able to screw with the counter person at (Shucks, we don't havit). lol.
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