351c heads on a 351w block

Discussion in 'Technical' started by Yellow72Mavrick, Aug 7, 2008.

  1. Yellow72Mavrick

    Yellow72Mavrick Banned

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    Hi yall, long time no type to, I hope you all are doin good. I have a 71 351w block and a set of 70 2 barrel 351c heads. I have heard these heads will bolt up to the windsor block with the correct intake
    I have found the correct intake. What more would I have to check to bolt this thing together and make it work. Any help would be great. thanks in advance...Jim:hmmm:
     
  2. PaulS

    PaulS Member extrordiare

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    The heads have to have some holes plugged, others drilled. Its the way they get coolant through the heads back to the radiator.
     
  3. newtoford

    newtoford Member

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    people put C heads on 302 blocks. i'd imagine whatever they have to do to make that happen is that same as what you'd have to do to put them on a 351W since W and 302 heads interchange? idk who makes an intake for that aplication though??
     
  4. baddad457

    baddad457 Member

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    Edelbrock does, that's who. (y) They're making two intakes, one each for the 302 & 351W
     
  5. baddad457

    baddad457 Member

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    You'll have shock tower issues doing this with a Windsor block in a Mav. Better to do it with a 302 deck block in a Mav.
     
  6. maverick1970

    maverick1970 MCG State Rep

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  7. Yellow72Mavrick

    Yellow72Mavrick Banned

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    Shock tower room is no problem since the motor is going in a 76 ford E150 shorty van.
    Going to use it as a pulling vehicle
    thanks guys.
     
  8. ratio411

    ratio411 Member

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    2v heads on that block will do well.
    If you put a stroke on it, 393 or 408, it'll pull like no tommorrow!
    I had a 69 4v 351w in an F100 and that thing pulled a bedfull, a 16' trailer, and stuff packed in and around my 75 Mav on the trailer... over the Smokey Mtns without having to downshift. It was a 3 speed, and I just left it in 3rd, it didn't even struggle.
    That was with ported stock Windsor 4v heads and 1.94 valves.

    The C 2v heads would support many more cubes IMO, for a pulling application.

    When you are dealing with C heads, if you intend to keep the stock rockers, find a set of stock iron pedestals. Most 2vs had aluminum pedestals that can gall up under load. This can cause eventual failure of the drivetrain over time. However it puts aluminum filings in your oil here and now. The iron ones don't gall up.
    The way the old timers tell real fast which pedestals (fulcrums) they have is to stick a magnet to it. When they are dirty and greasy, they are hard to tell apart.

    Also, most Cs came with weak multiple groove valves and keepers.
    Most folks doing any kind of build swap to single groove valves and keepers.
    The multi types are notorious for failing and dropping valves.

    If you do a home port, don't do anything to the bottoms of the exhaust port.
    Raise the roof, gasket match the sides, and port the bowls.
    You probably shouldn't touch the bottoms of the intake ports either, but I don't think it is very critical on 2v heads.

    Sounds like a good build for a tow vehicle.
    I'd like to hear about the progress.
     
  9. ratio411

    ratio411 Member

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    Forgot to mention: The open chambers on 2v heads don't like a great deal of compression. They will have detonation issues under load between 8.5 and 9.0 compression. And that ain't much. I'd keep it around 8.0 to 8.5 with a tow vehicle.
    You'll most likely use regular when tooling around, but need premium when towing.
     
  10. Yellow72Mavrick

    Yellow72Mavrick Banned

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    thanks ratio nice to hear from you my friend....
     
  11. Mavman72

    Mavman72 Gone backwards but lookin' forward

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    Pistons...the windsor pistons have the valve reliefs in the wrong place for a canted valve head(351-C) you will need pistons for a cleavor type build.They have the corrct valve reliefs so your pistons and valves dont get up close and personal.
     
  12. ratio411

    ratio411 Member

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    Excellent point!
    You can look at this 3 ways:
    1: Keep the lift low and check it closely. Chances are good an RV cam won't have issues.
    2: Look for Cleavor pistons. The most cost effective will probably be hypertectic (sp?)
    3: Depending on your Windsor pistons, you could probably have the basic Cleveland type eyebrow flycut in at your favorite machine shop.

    Since we are getting down to brass tacks, you will also need to order your pushrods. Either measure up and go down to Democrat Rd to have Comp to make you a set, or order some Clevor specific rods.
     
  13. baddad457

    baddad457 Member

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    The iron fulcrums are easily found in the late 70's 351M/400 heads. As are the better single groove valves.(1978 to 1982's) The fulcrums can also be robbed off a 370, 429, or 460 truck motor
     
  14. Yellow72Mavrick

    Yellow72Mavrick Banned

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    Thanks for all the info guys, I'll start gathering bits and pieces soon. I have the heads torn down now getting them checked for cracks etc. Jim
     

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