My 460 Build

Discussion in 'Gasoline Engines' started by FordGuy100, Sep 15, 2017.

  1. FordGuy100

    FordGuy100 Registered User

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    I've decided (aka been wishy washy) on what to do with my 2 trucks. I'm going to focus on tearing apart my F250 and going through it in the best body on rebuild as possible. In the mean time, I'll need a truck to do my weekly truck duties, so I'm going to give the 460 more love.

    So far I've rebuilt the carb and bumped ignition timing into the 12-14 BTDC range. It is chuffing out the exhaust, and the old dollar bill trick tells me that it has a burnt valve or two. So I'm pulling the heads this weekend and will have them sent out.

    I have a gasket kit ordered up, along with a straight up timing set. I'm thinking about getting a mild (and cheap) cam since I will have this thing apart anyways. Summit sells this K3500 cam with the following specs:

    Basic Operating RPM Range:1,200-5,000

    Intake Duration at 050 inch Lift:204

    Exhaust Duration at 050 inch Lift:214

    Duration at 050 inch Lift:204 int./214 exh.

    Advertised Intake Duration:282

    Advertised Exhaust Duration:292

    Advertised Duration:282 int./292 exh.

    Intake Valve Lift with Factory Rocker Arm Ratio:0.486 in.

    Exhaust Valve Lift with Factory Rocker Arm Ratio:0.512 in.

    Valve Lift with Factory Rocker Arm Ratio:0.486 int./0.512 exh.

    Lobe Separation (degrees):112




    After the heads are gone through I'm thinking I'll try my hand at giving them a mild port job. This motor is extremely low compression, so its never going to be a tire fryer, but that's alright. I'm going to ditch the air injection system, and delete the EGR functionality as well.


    If anybody has any suggestions on cam's for this build I'm open to hearing. Low RPM, high idle vacuum is what I would like.
     
  2. Dieselcrawler

    Dieselcrawler i pooped today! Staff Member

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    I been reading lots of praise on the comp 268. I also plan on getting stealth intake for it
     
  3. FordGuy100

    FordGuy100 Registered User

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    I was worried I was going to run into loosing to much bottom end with that cam. I've also read that the Weiand doesn't do as well as the Edelbrock 2166 down low. It seems like everyone has their own opinion on things though so who knows.
     
  4. FordGuy100

    FordGuy100 Registered User

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    If you decide to get rid of that edelbrock intake let me know.
     
  5. FordGuy100

    FordGuy100 Registered User

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    IMG_1529.JPG IMG_1531.JPG IMG_1532.JPG IMG_1538.JPG
    So I got the passenger side head pulled off. Cylinder wear looked decent except for that one spot where the cross hatch looked kinda scuffed.

    Valves were pretty carboned up but no obvious burnt valves. Exhaust valve on cylinder 8 is about 10 thousandths down (towards cylinder) compared to the other 3 valves. Maybe that's what was causing my chuffing exhaust, stumble idle problems?

    I might just pull the valves myself and hand lap it. I'd be surprised if I put 1000 miles on it between when I get this done and when I swap it
     
  6. FordGuy100

    FordGuy100 Registered User

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    Note, I'm holding a straight edge on the valve stem tips to see if there is any discrepancy in height. All the intake valves had the same height's, the above exhaust valve is on cylinder number 8 which is lower then the other 3 by about 10 thousandths per the feeler gauge.
     
  7. FordGuy100

    FordGuy100 Registered User

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    Those are the worst of the exhaust valves. No chunks missing but definitely some pitting going in. Head has some minor pitting in the valve seat area but nothing major. Went ahead and ordered some valves and I'll hand lap them in place and call it good. Going to get the heads hot tanked so I don't get filthy every time I touch them. Also got some stuff to do some minor head porting.
     
  8. towcat

    towcat Administrator Staff Member

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    do yourself a favor and get a degree wheel and check the numbers. I've found consistently a retard of 4* from the factory. was told by the older mechs, ford did it to pass smog. made a night and day difference in my repo truck. mileage still sucked, but the exhaust manifolds weren't glowing after a hard run.
     
  9. FordGuy100

    FordGuy100 Registered User

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    Thats the plan Calvin. I bought a timing chain and sprocket kit that will allow me to run straight up, or even advanced timing.

    Found a place to hot tank and magnaflux the heads so I'm taking them there this weekend.
     
  10. FordGuy100

    FordGuy100 Registered User

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    Got the heads, valve covers, and intake back from the machine shop. Heads checked out good, they were surface 5 thousands. I'm thinking I should throw some paint on everything, but first I'm going to start doing some port work. One head already had a plug in the back of the head for where the air coming from the air pump would go. Kind of odd. I'm going to drill and tap them for pipe plugs to get rid of the air pump system.
     
  11. Dieselcrawler

    Dieselcrawler i pooped today! Staff Member

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    yea i am going to seal off the smog holes, my cam and chain set arrived tuesday. maybe one day i will get it on the stand.
     
  12. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    Besides the cam timing, one other thing that helps a 460 is to put a pair of "dove" heads on them to raise the compression.
     
  13. Ds2853

    Ds2853 Registered User

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    Look at the stuff designed by Harold Brookshire for Lunati cams. The voodoo series. He is the man.
     

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