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Old 05-31-2012, 02:34 PM   #1
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400 hp 5.0?

alright guys, i have a 1968 coupe with the origional 289. i was thinking of swaping it for a 5.0 from a junk yard to get more power. my goal was to fix it up to get somewhere near 350 hp and still be streetable. problem is im not entirely sure how to do it... any ideas? all help appreciated.
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Old 05-31-2012, 03:38 PM   #2
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Starting with a factory block, have it bored .40 over and decked to make sure everything is true. By a stroker kit from a vendor of your choice making sure to get all forged internals. Then have a shop balance the rotating assembly. If you are capable, put the short block together. Make sure to get a main stud girdle.

Then get a heads/intake/cam of your choice such as trick flow, edlebrock, etc. Install the combo and finish it up with a MSD ignition system, carburator and exhaust of your choice.

Depending on which heads, cam, intake and carb you choose, this should be good for around 400-450 to the wheels. Keeping the cam on the mild side will keep you nice and streetable. Good luck.
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Old 05-31-2012, 05:10 PM   #3
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Re: 400 hp 5.0?

Go to the 79-95 forums and read the "Useful Info" sticky thread. There are a couple of articles on 400 HP 5.0 combinations.

I would not go over .030" on the bore. That is the maximum recommended by Ford.
People can and have bored them up to .060" over sized, but it usually leads to overheating and durability issues.
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Old 05-31-2012, 05:14 PM   #4
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Quote:
Originally Posted by Trojan Horse
Go to the 79-95 forums and read the "Useful Info" sticky thread. There are a couple of articles on 400 HP 5.0 combinations.

I would not go over .030" on the bore. That is the maximum recommended by Ford.
People can and have bored them up to .060" over sized, but it usually leads to overheating and durability issues.
I didn't mean .40 I meant 0.040. Gonna need that to get to 347.
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Old 05-31-2012, 06:07 PM   #5
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Re: 400 hp 5.0?

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I didn't mean .40 I meant 0.040. Gonna need that to get to 347.
I figured that was what you meant.
I still wouldn't go to .040" without sonic checking the block and inspecting for core shift.
To me a 347 just isn't worth the hassles they can cause using a stock block.
I'd start with a 351W instead. Much stronger block and lots more cubes possible.
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Old 05-31-2012, 06:21 PM   #6
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Ok how About stroking to a 331 from the 5.0? That. Could get up to 350-400 and be street able right?!
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Old 05-31-2012, 06:27 PM   #7
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Re: 400 hp 5.0?

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Ok how About stroking to a 331 from the 5.0? That. Could get up to 350-400 and be street able right?!
IMO, that's a "safer" combo and yes you should be able to achieve that HP with it.
Are you against using a 351W instead?
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Old 05-31-2012, 07:10 PM   #8
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Not really but I imagine a 331 is more fuel efficient and it is a lot lighter.
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Old 05-31-2012, 07:33 PM   #9
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Myself, I am torn between a stock 302 (around 235hp) after talking with TH (prolly the smartest man ive ran into in forums with any Mustang) and a bored .030 306 with build as seen on the 302 blue oval build in power block with a top end selection as shown and a bottom end kit at around 3k but results just over 400hp from parts supplied by Summit. I am building a 66 for daily driving, reliability and fuel economy in mind.
It's either that build or a 1.8l Kia engine with a fart can for my 66 coupe build, (yes......kidding)
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Old 05-31-2012, 07:55 PM   #10
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Re: 400 hp 5.0?

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Not really but I imagine a 331 is more fuel efficient and it is a lot lighter.
A bit lighter, not enough to worry about if you use aluminum heads and intake manifold.
If you are after fuel efficiency then build a 302 or 306 instead, but when you start talking about making 350+ HP then fuel mileage starts to go out the window. The only way to make that power is with more air and fuel flow. A bigger engine may consume a bit more fuel, but it also produces a lot more torque which in turn gets the car moving easier than a smaller cubed engine. There are trade offs either way.

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Myself, I am torn between a stock 302 (around 235hp) after talking with TH (prolly the smartest man ive ran into in forums with any Mustang) and a bored .030 306 with build as seen on the 302 blue oval build in power block with a top end selection as shown and a bottom end kit at around 3k but results just over 400hp from parts supplied by Summit. I am building a 66 for daily driving, reliability and fuel economy in mind.
It's either that build or a 1.8l Kia engine with a fart can for my 66 coupe build, (yes......kidding)

Build the 306 and run an overdrive transmission with 3.27 or 3.55 rear end gears. My 86 GT gets 24-26 MPG with a 405 HP 306, 3.55 gears and a WC T5 transmission IF, I stay out of the throttle. Once I surrender to the urge and open it up the fuel mileage goes quickly out the tailpipes and drops into the 17-18 MPG range.
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Old 05-31-2012, 07:58 PM   #11
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Edlebrock makes a kit for a 289/302 that dynos out to about 365 and its just heads, intake Manifold and a mild cam
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Old 05-31-2012, 08:18 PM   #12
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Woe you got a 306 to 405 hp?! That's pretty good mpg! How did you do that?!
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Old 05-31-2012, 08:53 PM   #13
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Re: 400 hp 5.0?

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Woe you got a 306 to 405 hp?! That's pretty good mpg! How did you do that?!
The MPG or the HP?
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Old 05-31-2012, 09:00 PM   #14
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Both bro!
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Old 05-31-2012, 09:24 PM   #15
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Re: 400 hp 5.0?

Engine: 306 Keith Craft Racing shortblock with forged H-Beam Rods & JE Forged pistons, cast steel crankshaft with stock stroke, 9.5:1 compression.
Edelbrock Performer RPM heads, Crane 1.6 roller rocker arms, BBK Equal length shorty headers, 75MM MAF set for 24lb injectors, 65MM FMS Throttle Body, 24lb FMS injectors, Ported Cobra upper & lower intake, conservative tune with 12° timing.


MPG:
3.55 rear gears, 26.6" rear tire, WC T5 manual transmission, smooth no jackrabbit take offs, steady 55-60 MPH maximum and do not go to WOT for anything.
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Old 06-01-2012, 12:44 AM   #16
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My budget is like 2500 to 3000 bucks. How much is that edlebrock kit? Right now a stroker seems to be the best choice.
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Old 06-01-2012, 12:58 AM   #17
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Re: 400 hp 5.0?

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My budget is like 2500 to 3000 bucks. How much is that edlebrock kit? Right now a stroker seems to be the best choice.
It might be difficult to do with that amount.
My shortblock was $2500 and a HCI kit is going to run in that neighborhood too.
Check out the Trick Flow top end/HCI kits.
They have one for an EFI engine that will make 360 HP.
I'm not sure what they have for carbed engines, but I'd bet they have something similar.


Top End Kit & HCI = Heads, cam & intake.
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Old 06-01-2012, 01:23 AM   #18
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Ok so I found some kits on summit like the 2091 edelbrock kit. I imagine I will need a new crankshaft and performance pistons on either my 289 or the 5.0 if I get it. And will something Iike this be street able?
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Old 06-01-2012, 05:56 AM   #19
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Quote:
Originally Posted by My68mustang
Ok so I found some kits on summit like the 2091 edelbrock kit. I imagine I will need a new crankshaft and performance pistons on either my 289 or the 5.0 if I get it. And will something Iike this be street able?
From what I saw and remember I don't recall much on the bottom end. I'll get the exact info from what I saw tonight. It was a carbed build for lower budget, drivability and fuel economy. EFI setup would no doubt help with economy but i like an old school Carb look with my 66. I got a hold of a good running 5.0 and freshly rebuilt AOD tranny for my starting point costing me $500 for the whole car. I know the guy and he nothing bit electrical issues with his car so 500 was a deal for him. So I already don't have a lot of cash tied up in it.

Found the episode on their site. Hope it helps.

http://www.powerblocktv.com/player/s...-01&ep_show=HP
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Old 06-01-2012, 05:16 PM   #20
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Yeah I just saw it, it did. But that mustang was making the most power at like 6000 rpm. Wouldn't that be rough at idle?
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Old 06-01-2012, 05:53 PM   #21
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Re: 400 hp 5.0?

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Ok so I found some kits on summit like the 2091 edelbrock kit. I imagine I will need a new crankshaft and performance pistons on either my 289 or the 5.0 if I get it. And will something Iike this be street able?
Yes, it will be perfectly fine for the street.
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Old 06-01-2012, 06:20 PM   #22
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Really? I just got off the phone with some guy from jegs and he Gave me attitude for asking if was good for a daily driver. Said rpm would be high and have a rough idle with a lot more fuel consumption...... Wait I just talked to a guy from summit asking the same thing about the 2027 kit and he also said it would be just fine on the street a little rough but not bad.
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Old 06-01-2012, 06:51 PM   #23
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Re: 400 hp 5.0?

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Really? I just got off the phone with some guy from jegs and he Gave me attitude for asking if was good for a daily driver. Said rpm would be high and have a rough idle with a lot more fuel consumption.
You must have gotten a hold of a stupid tech.
I doubt the cam has the lift and duration of my X303 and it does fine on the street with no high idle. You will have a bit of rough idle with any performance kit, I seriously doubt that one is excessive.


If I were you I would go with a 5.0/302 out of an 89-93 Mustang.
Then you can use a roller camshaft which will be somewhat smoother and develop more power than the old flat tappet cam engines.
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Old 06-01-2012, 07:17 PM   #24
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Yeah now a top end kit sounds better than a stroker kit. It makes good hp without so much guess work which is good for me since I'm kinda new to the game, in case you couldn't tell ha.
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