Author Topic: Worth spending money on a 289 for power?  (Read 19060 times)

ouch1

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Re: Worth spending money on a 289 for power?
« Reply #20 on: April 15, 2010, 08:57:38 PM »
That Unibody construction on a classic won't handle the power and torque of a big block unless you do some serious frame work.  The stroker idea will even be too much power for a classic body if left as it is.


All you really need to do to beef up the strength of the body is install a set of sub-frame connectors, and this kit: 1965-68 Mustang Coupe/Fastback Chassis Strengthening Kit $349.99 at Mustangs Plus.

Soaring

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Re: Worth spending money on a 289 for power?
« Reply #21 on: April 15, 2010, 09:56:27 PM »
Yup. sub-frame connectors is where you need to start.  Front to rear, and left to right. 

SnaKe

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Re: Worth spending money on a 289 for power?
« Reply #22 on: April 16, 2010, 12:56:34 AM »
So I've looked at beefing up the 289, and it's looking like a better idea to just get a new engine and stiffen the subframe etc

(AUS Dollars)
The 289 Alloy headers are about $2400~
Intake $300~
Cam $300~
Stiffening (allow about $400)
Ignition $
Labor $

Already got:
flo-tech long headers 4 into 1 ($500~)
custom mandrel bent 2.5" twin exhaust with 'X' pipe ($1200)
reset leafs, lowered with new shocks, big sway bars, all new nylon bushes, suspension overhauled ($2000)
gilmer drive ($300)
Holly 600cfm 4 barrel carby ($ cant remember)

Thinking it might be a better option to find a 302 and overhaul it, stroker kit and clean it up. Keep the 289 in storage since its a really clean engine (almost show quality) and it hasn't been modified much.

So start by getting some sub-frame strength, then find a 302 and go from there...
Going to talk to my mechanic next week, see what he thinks before I go crazy :P

Tim175

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Re: Worth spending money on a 289 for power?
« Reply #23 on: April 16, 2010, 01:14:12 AM »
$2400 for headers? Where the f*ck are you looking? Check summit they have several pairs ranging from 150-400.

Soaring

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Re: Worth spending money on a 289 for power?
« Reply #24 on: April 16, 2010, 06:37:52 AM »
Yeah 2400 Aussie dollars is way to much for headers.  Unless they are gold plated.   ;D

Jeff73Mach1

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Re: Worth spending money on a 289 for power?
« Reply #25 on: April 16, 2010, 10:15:53 AM »
I suspect he means alloy heads.

a 302 block does support the piston skirts a bit more, but the power difference that you get from the tiny bit of extra displacement is negligible.

If you stroke it, you might want to limit it to a 331 stroker as opposed to the 347 as the street life durability of the 331 is going to be better than the 347.

Good luck and let us know what you do.

racingjz

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Re: Worth spending money on a 289 for power?
« Reply #26 on: April 18, 2010, 06:56:10 PM »
hay on a 331 stroker what has to be done besides the cylinders borded out?
 8)

Tim175

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Re: Worth spending money on a 289 for power?
« Reply #27 on: April 19, 2010, 12:47:17 AM »
You need to make the stroke longer, so you will need to get a new rotating assembly for a 383. With a .30 over bore you need a stroke of 3.250" i believe. Hopefully someone can verify that for me.

Soaring

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Re: Worth spending money on a 289 for power?
« Reply #28 on: April 19, 2010, 06:31:41 AM »
Basically what the word "stroker" means is that the stroke of the rods is a tad longer, giving you more torque.  A Stroker is an internal combustion engine that has been modified to increase displacement by replacing the stock crankshaft with a crankshaft that has more throw. This increased throw necessitates modified pistons and usually new rods. The increase in displacement resulting from stroking an engine will almost always result in an engine that produces more torque (and HP) than the stock engine.


racingjz

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Re: Worth spending money on a 289 for power?
« Reply #29 on: April 19, 2010, 04:14:33 PM »
i know that do i gots to clearens the block like the 347? for the bottom end

ouch1

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Re: Worth spending money on a 289 for power?
« Reply #30 on: April 19, 2010, 04:32:31 PM »
Well to be safe I would probably go to a 331 at most on a 289. uless you get it resleeved to handle the longer stroke/bore.

6mustang6

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Re: Worth spending money on a 289 for power?
« Reply #31 on: April 20, 2010, 10:45:39 PM »
I believe you can get 300hp out of a 289 with a top end build only. Im currently in the process of building mine. It's getting ported and polished 289 heads(to keep compression up) a weiand stealth intake, holley 670 CFM carb, headers, and a comp cam XE274. Im fully expecting to be in the 300 crankhp range with this setup or i will be disappointed. I already have upgraded ignition or i would do that too. A pertronix is the first thing i'd do for the engine actually!

Soaring

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Re: Worth spending money on a 289 for power?
« Reply #32 on: April 21, 2010, 12:22:05 PM »
I think you are going to be disappointed in that 670 CFM carb.  Too big for your 289.  But, I could be wrong.  Let us know how it turns out.  I have the Pertronix on my 289, and it is all the power I need to push that little unibody down the road at just about any speed I want to go for the construction of that body.  If you go over 80-90 MPH in these old dinosaurs, you are taking your life into your own hands.  She will start to float unless you beef up the suspension.   (Ask me how I know?) ;D

Tim175

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Re: Worth spending money on a 289 for power?
« Reply #33 on: April 21, 2010, 12:24:41 PM »
I don't know the specs on the cam, but depending on how big it is i think the 670 is fine.

Soaring

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Re: Worth spending money on a 289 for power?
« Reply #34 on: April 21, 2010, 12:29:59 PM »
Unless you have the compression and the fire power, that big of a carb will cause "wash down" and unburnt fuel.  Let's see how it turns out. 

Tim175

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Re: Worth spending money on a 289 for power?
« Reply #35 on: April 21, 2010, 02:19:32 PM »
Well if hes using the stock heads his compression should be well over 10:1, if he uses an electronic ignition which i think he said he is, and a big cam, i would think it would be fine but like you said we will have to wait and see ;D

Soaring

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Re: Worth spending money on a 289 for power?
« Reply #36 on: April 21, 2010, 02:40:56 PM »
There is a reason why the Ford factory put on Motorcraft 4100 480 CFM carbs.  It's called efficiency.  If you want more power than what the factory engine provides, you have to add more power through adding power add-ons.  I don't see where the power add-ons are present, except for the cam that may or may not give enough lift to warrant a 670 CFM carb.  Just my opinion. 

ouch1

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Re: Worth spending money on a 289 for power?
« Reply #37 on: April 21, 2010, 05:26:10 PM »
Here is some info on what I think is the cam he spec'ed out:

Brand:  COMP Cams
Manufacturer's Part Number:  31-246-3
Part Type:  Camshafts
Product Line:  COMP Cams Xtreme Energy Camshafts
Summit Racing Part Number:  CCA-31-246-3
   
Cam Style:  Hydraulic flat tappet
Basic Operating RPM Range:  1,800-6,000
Intake Duration at 050 inch Lift:  230
Exhaust Duration at 050 inch Lift:  236
Duration at 050 inch Lift:  230 int./236 exh.
Advertised Intake Duration:  274
Advertised Exhaust Duration:  286
Advertised Duration:  274 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:  0.520 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:  0.523 in.
Valve Lift with Factory Rocker Arm Ratio:  0.520 int./0.523 exh. lift
Lobe Separation (degrees):  110
Intake Valve Lash:  0.000 in.
Exhaust Valve Lash:  0.000 in.
Computer-Controlled Compatible:  No
Grind Number:  FS XE274H-10
Here is the details from Comp Cams webpage: http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=801&sb=2

Soaring

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Re: Worth spending money on a 289 for power?
« Reply #38 on: April 21, 2010, 05:54:09 PM »
Yeah, that's not much more cam than factory. 

Tim175

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Re: Worth spending money on a 289 for power?
« Reply #39 on: April 21, 2010, 06:35:49 PM »
I don't see you getting 300 hp with that cam, unless you have a lot of other bolt ons. And now that i see the specs of the cam i agree 670 is going to be too big. I would get a 600 Holley.

 

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