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Ford Truck Club Forum > GARAGE TALK > Garage Talk: Engine & Drivetrain



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  #1  
Old April 9th, 2014, 10:48 PM
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IrishKRO IrishKRO is offline
 

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Default 351W Build

Hey FTC!

So I am currently building a 351W for my 91 F150. For right now I would like to reach out to you guys and see if anyone has any good ideas on a moderate build. I am looking to get a good bit of power from it. When I do the swap I'll also have 4.33's in the front and rear diff's as well as have converted it over to MAF. I would like to have something in the 400-500ft/lb for torque and 350-450 for HP. Any advice would be appreciated.
  #2  
Old April 10th, 2014, 12:25 AM
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GT40P Heads, Longtube Headers, Roller Rockers, I hope you went with a 94-97 351w Block or at least a Block capable of being Roller Cam, that'd be a huge benefit over Flat Tappet! 4 Hole Injectors, engine's all dandy, but if it's Auto, are you building to support this new power?
  #3  
Old April 10th, 2014, 12:45 AM
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It's from an 88 but I have a buddy who can machine it for a roller. I was going to try and find a zf for it but if not i'll go with a built AOD (I currently have one so its cheaper). I was also thinking of doing Aluminum heads. A brand new set of GT40's are only $600.
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Old April 10th, 2014, 01:20 AM
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Your buddy can't machine it for roller, the lifter bores are taller and the lifter valley as 2 spots that are raised (extra material) that are drilled and tapped for the spider. GT40s are also cast iron, not aluminum. Are you talking about GT40Ys?


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


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Old April 10th, 2014, 01:45 AM
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Suppose so. I believe they are ford racing. I'll get the link....and will a roller cam make that much of a difference?
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Old April 10th, 2014, 02:02 AM
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Yes, I have a pic comparing the stock flat tappet and a Mustang HO cam, I'll find it in a minute and post it. Roller cams require no break in, almost never wear, have lower oil temps, rev higher, and have MUCH more aggressive cam specs. If you are going for power with this build, you'll always regret not going roller if you don't, trust me.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


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Old April 10th, 2014, 02:07 AM
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Theres no possible way to convert the block to roller?
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Old April 10th, 2014, 02:10 AM
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Keep in mind, this isn't even a performance cam, this is just a stock Mustang HO cam. Look at the lobes on the cam on the left, then the right. See how gradual the slope is on the cam on the left and how steep it is on the right? That would be your valve opening faster to allow more air and fuel in faster. See how the cam on the left is basically at a point at it's peak? See how the cam on the right is at it's "peak" a lot longer than the left? That's the valve being open longer, to let more air\fuel in, longer. With roller cams you literally have a roller on these lobes, so they can roll right up these steep inclines at high RPM. Flat tappet is metal on metal so they (the cam and lifter) would just grind against each other all the time. On top of that, flat tappets havea break-in that if you don't do it right, you will have a complete shit motor in less that 10,000 miles. On a flat tappet cam the lifter literally spins on the cam, so the break-in wears the 2 surfaces (cam and lifter) together. If you don't do it right, you get metal dust from the cam lobes and bottom of the lifter circulating through your engines. Bearings love that, so do cylinder walls. Anyways, enough rambling, go roller. Pic:



89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


  #9  
Old April 10th, 2014, 02:11 AM
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Quote:
Originally Posted by IrishKRO View Post
Theres no possible way to convert the block to roller?
You can get linkbar lifters, but then you'll spend 5x what you would a roller 351w block would cost you. As far as anyway that financially makes sense? Nope, you're boned.


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


  #10  
Old April 10th, 2014, 02:34 AM
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Looks like i'm gonna have to just rebuild it stock then and wait till I can get my hands on a roller block =(


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