First off I hope I'm in the right spot for this post? I have been reading tons here as well as the fordsix forum I see mentioned alot here

Like I said I want a few more pony's from my 300 but I dont want to give up my low end torque as this is a '86 f250 work/offroad/jeep trial truck with only 105k miles on it...

From what I read it seems ford didn't do so well on air flow prier to the efi models for the 300 and it seems that is a easy way to wake the 300 up alot? 'good bang' for the buck ya know

here is my game plan so far....

1. go with the efi exhaust for it's ease in installing verses a 'header' with the walker y pipe and 2.5" out the back. Feed back would be great on a good high flow muffler

2. Clifford water heated intake with a holly 390(will this need to be jet'd for my 300?)

3. seems I will also need the DuraSparkII Ignition setup but I haven't got that far in my research here any good links to a howto on the switch over? I didn't see a sticky on it yet in my readings.

Am I on the right track here to get'n a bit more air flow thru my 300 thus a bit more pony's?

there is no smog setup on this engine, how much will need mod'd to to bolt this setup up to fit? like brackets/grind'n

thanks for any and all input or links you can point me to that might help

 

get some work done to the head if you have the money

 

EFI manifolds and the clifford intake/holley carb combo will certainly wake the old girl up. Porting would add more pep, but requires removing the head, something I'm assuming you want to avoid for now.
For a low restriction muffler, I'm fond of the flowmaster 40 on mine. It makes enough noise to be heard when I want, and still quiet as a churchmouse inside the cab running down the hiway.
I can't really help on the DS2 conversion. I hear it's far more reliable than the TFI.

 

Lots of stuff on the FSP 240/300 Forum on the DS2 swap and the ClassicInlines.com Tech section on recurving the DS2 for pre-emissions running.

BTW, what do you mean by "low end torque" and in particular, where in the usable rpm range are you concerned about?

 

+1 on the efi manifold, headers are a pain in the a$$. The heads are the real restriction points on the 4.9, a P&P would make a big difference, but you might not wanna go into that yet.

 

use the offy dual plane you will actully get more bottom end. best part is that it works well with stock headers and cam. 390 carb i think is the recomended one for your app. the TFI is actully more relliable but with you changing the carb you wont have a feed back carb. but the DS2 is more simple and to do the conversion all you have to add is a ballest resistor. somewere their is a full description on how to do it i found it but ill have to look for it again.

 

Sounds pretty much identical to what I did to my engine, except I used an Offenhauser DP and a heated spacer instead of the coolant heated Clifford.

The gains over stock are enormous, and it's no longer the same engine, so don't expect to pick up just a "few" ponies. I can't imagine what a P&P (highly recommended) will do as well when I get around to it.

The 390 will most likely require tuning, I know mine has.

1981 Ford Bronco Four barrel conversion pictures, videos, and sounds | SuperMotors.net
1981 Ford Bronco Exhaust Upgrade pictures, videos, and sounds | SuperMotors.net

 

Thank you all for the reply's

thanks... gonna pull the engine so mise well pull the head since it seems that is something I have over looked I have seen the flowmaster 40 brought up alot and from what you say about it thats just what I was looking for

thank you, gonna be search'n in the next few day's on the conversion and recurving of the DS2, as for low end torque I meant I want to still be able to pull stumps and not have to get on the gas to get some work out her

think'n I will get into that, thank you for your input

Thank you for the info, I will search ballest resistor and see what comes up

Thanks a ton for the links, google images wasn't doing to good in my search for piccy's, thanks for take'n the time to do that kind sir would you happen to be able to point me to a heated spacer for that intake and carb?

couple more questions now come up on the port and polish, anything special to know that I need to know on the 300 head? not sure if there are options on what can be done?

and about how much does a P&P run?

thank you all for your input

 

Glad the pics were helpful!

I personally got my heated carb spacer from Harte3. I think they come off of Ford Galaxy V8s (not sure on that). They're basically a carb spacer with a coolant line going in one side and out the other. If not, you can always hook up a carb heater like I have pictured in the exhaust pics. There's an opening for it on the bottom of the Offy intakes.

I asked a local shop what they'd charge for a P&P and they said around $350. It's really not a bad price for the time it takes to do one. But, if you have some power tools, the willingness to learn, and a good few days, you can do it for relatively cheap. There's some very informative videos on YouTube about the process.

 

The flowmaster 40 was a pretty easy choice for me. My old muffler was starting to rust, and the tailpipe fell off.
A freind gave me the 40 after having used it for a temp (6 weeks) solution under a jeep. Free was the key point in me going with the flowmaster......

 

let us know how it goes

 

The DSII swap is easy. You can get one from a junkyard if available, but the whole system new is pretty cheap and available. NAPA sells the connecting plugs made by Standard. Lot cheaper than MSD ignition.

 

thanks for the info, I did head over to youtube and yep for around $350 I think your right gonna call around and will report back on what it cost me.

Still have to source out the spacer and if not your howto out the bottom piccys will work a charm.... thank you

Kinda hard to beat free 'eh, nice friend ya got

I plan on it and will post up piccys as I go along, just get'n my ducks all in a row right now and wait'n on better weather here to get started

thanks, great info and I did get time to search around today and think I might go a different route which I will explain why for all.

do to the closest junk yard/parts store being 50 miles away and my disability's the more I can order to the door and have it plug and play the better

I came across this DUI Performance Distributor - Big Six is this plug and play for the 300? unless I missed it it just says big 6

If so this would be great for me... any one use it and does it need recurve'n and if so is there a kit for it?

gonna order new efi exhaust manifolds and the cost isn't bad at all on those at under $120 to the door. beats a 100 mile trip any day in my book.

gonna get to order'n some parts later this week.

thanks all for the input.... cant wait to start

 

From the cost of the EFI manifolds you're looking at, it sounds like they're made by a proper company. Last thing you want is foreign knock-offs, since they usually aren't quite right and have leaking issues. Which company did you find them from?

As for the DUI distributor, they make them custom tailored for your specific setup and they make them for the 300. I can't tell you how they are, since I don't own one, but I will tell you that I definitely want one. High performance coil, ignition module, and distributor all tied into one, allowing for max gap on the spark plugs. Yes please.
If you get it, be sure to get some quality spark plug wires.


Look forward to seeing your finished project!

 

was look'n at 1AAuto.com

did see some up to 95+ tho in my search?