Skip to main content
Topic: Changing my mind. Going to a 5.8L instead of a 7.5L (Read 5073 times) previous topic - next topic

Changing my mind. Going to a 5.8L instead of a 7.5L

So yeah. I was out weighing the costs and stuff and desided on a 351w swap. I found a 96 F-250 5.8L engine for cheap. So I will start there.

Now what do you recomend for a cam and intake? I will stay with the stock E7 heads for now but I should change the cam out. Plus what is a good intake for all round street use? Is 70mm to big for a TB?

Thanks
1988 Thunderbird Sport. Work in Progress
5.8L swap w/fitech efi, 4R70W swap w/quick 4 controller, 2003 GT rear diff, 5 Lug swap

Bought this car back as an old project car.

:burnout:

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #1
Everything works together as one --- Heads, cam intake, exhaust, etc....

That being said what are you looking to get out of the vehicle? 
Projected power?
How high are you willing to/want go on the redline?



E7's will be a bottleneck on ANY performance oriented 351 IMHO.....They're barely adequate on a stock/near stock 302...
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #2
Quote from: V8Demon;296533
Everything works together as one --- Heads, cam intake, exhaust, etc....

That being said what are you looking to get out of the vehicle? 
Projected power?
How high are you willing to/want go on the redline?



E7's will be a bottleneck on ANY performance oriented 351 IMHO.....They're barely adequate on a stock/near stock 302...


I agree stock heads are really your limiting factor.  Are you going carb or fuel injection?
'88 'bird, 10.9:1 306 w/TFS top end, forged rods/pistons, T-5 swap & bunch of other stuff, 1-family owned, had it since ‘98, 5.0tbrd88 on Instagram and YouTube

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #3
Since he was asking about a 70mm TB...;)

As far as intakes for a 351wl, not so many to choose from, unless you're willing to spend a few $.

Mostly depends on your budget, and what power you want it to produce.
 
I don't know without looking at what's available now what there is in the way of intakes systems for a 351 in a car..there's the Lightning stuff, (GT40) but the lowers IIRC are hard to find..I've not looked for 351 stuff for some time now.
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #4
Where you already have a 302, a 5.8 makes perfect sense. You should be able to use alot of your fuel injection existing. I would go with the biggest throttle body you can find for a price you can live with. As far as intake goes, I'd use a "carb" style intake with efi bungs machined in. I think now a days they have them already to go for efi. You can put and elbow on it for the throttle body and have a stock location for the throttle cables.

While you got it all apart, I would definately look for some better parts. i would use a stock H.O. cam. Won't beat the HP per dollar there, and i would at least go for some gt-40's. Or even bigger if you have a few bucks to throw around.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #5
Quote from: FordTruckFreeek;296553
Since he was asking about a 70mm TB...;)

.


You got me there...my point was that it might be cheaper to build a carbed motor.
'88 'bird, 10.9:1 306 w/TFS top end, forged rods/pistons, T-5 swap & bunch of other stuff, 1-family owned, had it since ‘98, 5.0tbrd88 on Instagram and YouTube

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #6
I hate carbed motors. I leave them for offroading.

I want fuel injection. I know this sounds wierd but I may cheap out for now. If I get a 5.8L engine I may just use the BC Bronco's HO upper to 5.8L lower adapter, BBK headers, swap oil pan, A9L and mass air meter, H pipe and cat back, and get it all up and running. Then I can go for the bigger stuff like H/C/I and all the other stuff.

I have drivin the car with the Non HO 302 and it is underpowered and just plain sucks. Even a stock 88 TC has way more power than this car.
1988 Thunderbird Sport. Work in Progress
5.8L swap w/fitech efi, 4R70W swap w/quick 4 controller, 2003 GT rear diff, 5 Lug swap

Bought this car back as an old project car.

:burnout:

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #7
Go with a built and or stroked 5.0 and then you'll have no worries finding parts at all,and you can get tons of power from them as well..
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #8
Quote from: vinnietbird;296666
Go with a built and or stroked 5.0 and then you'll have no worries finding parts at all,and you can get tons of power from them as well..


a long time ago, you and i talked about this "power" topic with respect to the 302 and i wondered if you had a chance to look at the main bearing caps and how..

if.. new main caps were made, could'nt they be made to a 4 bolt style with the added two holes drilled in the block.

this wouldnt work on the front/rear caps but would along the middle.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #9
Sick88Tbird put an EFI 351w in his car...he could give you some tips probably...here's his 5.8 thread: http://www.foxtbirdcougarforums.com/showthread.php?t=24234


Oh, heya Scott:
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=9085 ;)

Christmas is coming up...buy me one? lol
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #10
Neat link for the 351 swap. Very interesting reading. Makes me want to think of what my next project will be.
2003 Marauder 300B
1996-97 Cobra wheel straight but weathered (For Sale)
84 TC manual shifter handle no  (For Sale)

BTW, I had a 1988 T-Bird Sport way back when. I found out that it was totalled shortly after trading it in. It still has the ignition switch recall to date.

Special thanx to EricCoolCats for showing me to this site.:bowdown:

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #11
Quote from: FordTruckFreeek;296699
Sick88Tbird put an EFI 351w in his car...he could give you some tips probably...here's his 5.8 thread: http://www.foxtbirdcougarforums.com/showthread.php?t=24234


Oh, heya Scott:
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=9085 ;)

Christmas is coming up...buy me one? lol


yeah,,, :D
i was just commenting on how much meat is there to add the modified caps.  its been a while since ive been in the bottom end of a motor, i remember there being a lot of space there for a wider cap.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #12
They're beefier than a king-size slim jim lol
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #13
the stock blocks generally crack from the main bearing studs/bolts all the way through the lifter valley. The problem isn't necisairly from holding the crank down, its the thickness of the block all the way through.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

go big

Reply #14
if you build a 351w and you use 302 parts you will make 302 power..I am building  a 351w 408 stroker this winter as well..if you want to know anything let me know...if can help I will...