408 efi

[jagbucket]

just ordered a 408 stroker kit and afr heads now i wonder if a 347 might have been the better choice.
now i see finding the lower lightning intake is difficult. are there ny other options to run a ford efi. Running a carb is a little cheaper but still around 600 if i go all new . Im aware efi will need additional programing and harness work but worth it in reliabilit and service .

 

[mp]

I am building a 408 using the GT40 EFI stuff. But I snatched up the lightning lowers back when they were easier to find (they were never cheap). Probably leaving some HP/Tourque on the table, but I already have the parts. Also building a stout 351W with my other GT40 setup. Good luck!

 

[rcmbronc]

Edelbrock has a nice Efi intake. Not cheap. I may use the new Pro Flo 4 EFI

 

[AZ69EB]

If you go OEM you are looking at purchasing the following items; lightening lower, cool lightening upper or explorer upper or 351W EFI intake, ecm, larger fuel injectors, cool fuel rails, after market TB, after market MAF, plug-N-play wiring harness, and all the other miscellaneous items not to choke the 408W. This doesn’t include tuning $$.

Or you can pick up a 4-barrel after market intake and the EFI kit of your choice for about $1K to $3k $$.

Do some research and add up all the cost for each system. Good luck.

 

[Broncobowsher]

Some food for thought...
http://classicbroncos.com/forums/showthread.php?t=196925
Lots of good data points in there.

 

[Rebel77]

I am building a 77 from the ground up. Going to have showroom body and paint. I probably will not wheel much but I still want to build it tough and capable. I will be running a EFI w351 with trickflow heads, trickflow upper and lower intake, etc... I plan on 35x12.5 tires with 3.5 wild horse suspension lift and either 1 inch or 2 inch body lift. Does anyone have suggestions on which BL I should go with? I need clearance for my w351 under the hood and enough clearance for my 35's.

 

[nvrstuk]

I run an Edelbrock 5.8 EFI lower and upper on my 418 stroker. Not sure they make them anymore... BUT, I almost went with the TrickFlow and here it is:

Trick Flow Specialties TFS-515L0004 - Trick Flow® Replacement EFI Lower Intake Manifold Bases for Ford Summit sells them

I run Mustang OE injection, controlled by Moates so I have true SEFI with EDIS ignition... I run it daily, some days much harder than others but I put over 1-2K month on it. Wheel it in Moab, Con etc...just saying it gets used a LOT and for all types of use.

Good luck

 

[jagbucket]

Yeah buying the stroker kit is the easy part . efi guy has my explorer ecm and i have the harness to modify. was not thinking about larger tb or maf but i suppose that makes sense with larger displacement and with larger injectors the fuel rails? The 750 dp holley i have hanging on the wall as decoration is looking more and more a viable option but still need a manifold for that.

I have been looking at the eldebrock intakes but not sure if the height will work or they only seem to be for upper end hp .

if i go lightning set up anyone know the hp it will support ? 4-450 would be the target with afr 185's

 

[nvrstuk]

An intake designed for "upper end" hp at higher rpm for a stock 351W isn't the same when installing it on a stroker....not saying these numbers are right but it's like stuffing a "wild" 351W cam into a 408 -- now all those extra cubes make it a "mild" cam... put an intake designed for 3-7,000 rpm on a 351W on a stroker and you have a good mid range intake for a 408...

You need to design the induction around the new cubes that this stroker has...don't just bolt on parts that fit...

what is the Bronco used for? How will it be driven? Dozen questions must be answered determining what you want before anybody can give you GOOD answers for what you need.

 

[MD]

408 is a much better Bronco motor than a 347 (this coming from a guy who has a 408 in a 2300# car and a 302 in the heavy Bronco). AFR 185 heads work great on a street 408. As nvrstuk says, make sure to match your induction properly. The AFR intake ports are 2.045x1.205 (non-ported), so pick something that matches that or more generally the Felpro 1260 gasket size. GT40s for example are as small a 1.65"x.95" for many castings, so they would make a terrible choice for a 408 with 185 heads. Think of it this way, going from a 3" stroke to 4", means 33% more piston speed by comparison. If you want to run to 5500 (and you should, because that is a minimum sweet spot peak for your combo), that looks like a 7300 rpm intake air event on a 302.

A simple inexpensive option is an Edelbrock Victor Jr manifold. Your Holley 750 would work pretty well with some tuning and the right off-road upgrades (at least at the same angles where you still have oil pressure).

The Trick Flow EFI, the GT40 and the new Holley Hi-RAM EFI Intakes are all about 11.5" High.

Michael

 

[jagbucket]

thanks all that is what i need to make a choice here. so it appears lightning parts are not what im looking for on a 408. it will drive mostly on street . but trails and some sand nothing to risk the body panels

On that last month i wanted to drive on a gravel road to test 4wd and almost got a ticket for trespassing on gov. land here on fort lewis WA., which used to be accessible, so 20 feet off the public road i encountered a huge sign with about ten points of no messages that i was reading when a pierce county sheriff slid up and wanted to know what i was doing? told him i was reading the sign. he scanned the bronco looking for a gun and thought i was hunting..so yes mostly street and next year a trip to the dunes in ore.
Think l'll let the two gt40 intakes on ebay go, thanks for the help

 

[AZ69EB]

Good choice. I had three Lightening Uppers and Lowers at the same time. Sold all three and purchased the Edelbrock 5.8 EFI for my 408W.

Your next hurdle will be headers. The largest diameter off the shelf headers is 1-5/8” primary tube from either Bronco Hut or BC Broncos. Both are good. But I believe Bronco Hut’s has a larger collector. Both are on the small size for a 408W as they were really designed for the 302 based engine. Plus, ARF 185 or 205 heads will have both a standard 2” and the 3” exhaust flange bolt pattern. The 3” spacing allows the primary exhaust tube not be pinched at the flange and allows easy access to the header bolts.

This is what slowed down my build. So, I sold my BC Bronco headers to force me not to take the easy way out. There is a great 1-3/4” primary tube fender wall header available, but only with the 2” bolt spacing on the exhaust flange.

If you build it, Don’t choke it! Do it right the first time. Good luck.

 

[68ford]

Custom headers are definitely spendy, but using the 3 in wide bolts in my heads with 1 3/4 primaries that step to 1 7/8, it is so nice being able to easily get ton the header bolts. Especially being you don't from under the dash haha plus custom headers usually always use a slip on merge collector instead of a form collector like all bronco headers which I believe make a noticeable different in mid-range torque.
https://www.instagram.com/p/BqnTA5tA4eo/?utm_source=ig_share_sheet&igshid=t1nfn3e8d8du
It's all.i got, but if you Xoom in you can see how much room there is around the header bolts.

 

[AZ69EB]

Looks like you have Jesel shaft mounted rockers. What RPM’s are you running?

 

[68ford]

Looks like you have Jesel shaft mounted rockers. What RPM’s are you running?

5600 hahaha I wanted all good parts being the truck is absolutely impossibly to work on. Also bought Isky ez solid rollers with no needle bearings. That was another 1300. I was anticipating around a 6500 HP peak. Truck has a 6400 chip which starts to donuts thing around 6200. Engine only looses 10hp from 5600 to 6300 it doesn't drop off. There's a dyno sheet on my Instagram. But basically built a quality engine able to really spin but doesn't
https://www.instagram.com/p/Bb7yRFHF_Hs/?utm_source=ig_share_sheet&igshid=12p8cqefsahtj
https://www.instagram.com/p/BplBfp8guXR/?utm_source=ig_share_sheet&igshid=81fe05waez09

 

[Broncobowsher]

5600 hahaha I wanted all good parts being the truck is absolutely impossibly to work on. Also bought Isky ez solid rollers with no needle bearings. That was another 1300. I was anticipating around a 6500 HP peak. Truck has a 6400 chip which starts to donuts thing around 6200. Engine only looses 10hp from 5600 to 6300 it doesn't drop off. There's a dyno sheet on my Instagram. But basically built a quality engine able to really spin but doesn't
https://www.instagram.com/p/Bb7yRFHF_Hs/?utm_source=ig_share_sheet&igshid=12p8cqefsahtj
https://www.instagram.com/p/BplBfp8guXR/?utm_source=ig_share_sheet&igshid=81fe05waez09

Filling the tank with Nitro or what?;D

 

[rguest3]

Jagbucket - Is an Edelbrock Performer RPM intake and a Holley Sniper out of the question?

 

[68ford]

Filling the tank with Nitro or what?;D

Haha oops 6500 rpm HP peak the old motor which was a 427 instead of a 438 pulled extremely hard and fast up until the rev limiter hit. The new engine is basically the same engine with better Lighter Valve train half a point more compression but a .100 more stroke. I figured the RPM range would still be very similar to the old engine. My little 302 in the Bronco with stock crank and rods likes to Rev to 7000 all the time ;D
https://www.instagram.com/p/BPjb_WtAa7j/?utm_source=ig_share_sheet&igshid=10penx6jeqqac

 

[jagbucket]

Rquest3 I have not heard good things about the throttle body efis in general . Off or just on the road if there's a problem i would be unable to fix it unlike a carb. but i have no experience with one, just from reading online. I am looking at the dual plane air gap now

 

[rcmbronc]

What about a Holley High Ram Intake with throttle body and port injectors. Use a Fast EFI system of Holley system. Should handle the larger motor size fine. Not sure on hood clearance but pretty cool and should be tunable for most HP levels. Looks like about $3200 with ignition.