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unleaded head..?

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fpv02l
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2010/07/28 20:38:54 (permalink)
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unleaded head..?

hi guys, about to start a rebuild on my pinto...wats needed to convert the head to unleaded? any help will be much appreciated...cheers corey.
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    Sterling
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    RE: unleaded head..? 2010/07/28 22:20:19 (permalink)
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    is it an aussie head? ive been under the impression for a while now that all aussie heads are already unleaded
    #2
    muzza
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    RE: unleaded head..? 2010/07/28 22:51:09 (permalink)
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    I think you need to have the valve seats hardened, The pinto motors are designed to run on leaded fuel, lead being the softener when coated over the valve seats.
    #3

    JamesR
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    RE: unleaded head..? 2010/07/28 23:34:41 (permalink)
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    quote:
    Originally posted by Sterling

    is it an aussie head? ive been under the impression for a while now that all aussie heads are already unleaded

    nope!
    #4
    escortinadriver
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    RE: unleaded head..? 2010/07/29 06:30:46 (permalink)
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    You will need to have hardened valve seats inserted in the head for the exhaust valves. Have a ring around before you settle on a place as the prices, (and method) will vary.

    Shaun
    #5
    Bloodyeck
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    RE: unleaded head..? 2010/07/29 09:11:37 (permalink)
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    Try to get a head off a Sierra injected engine. They have hardened valve seats and the inlet tracts are better shaped than the earlier Pinto head.
    #6

    spanner
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    RE: unleaded head..? 2010/07/29 11:19:05 (permalink)
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    mines got Telstar Valves.
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    fpv02l
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    RE: unleaded head..? 2010/07/29 16:37:53 (permalink)
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    cheers guys!!!!
    spanner....as im sure telstar valves would be easier to find and cheaper than sierra...wats needed to put these in..are they the same size as standard pinto? wat did it roughly cost u to do it to urs?
    cheers corey.
    #8
    escortinadriver
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    RE: unleaded head..? 2010/07/29 18:24:40 (permalink)
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    Ford Telsta/mazda FE valves are 44mm(dia) x 112(length) x 8(stem)

    They are/were a cheap upgrade instead of buying the grp1 gpr2 stainless valves. (When they used to cost an arm and a leg) Prices are much cheaper now so unless you are building to a student budget you're better off just getting some new, stainless and decent. (around $30 a valve)

    The valves themselves will not solve the problem, you still need to fix the seats.

    Shaun
    #9
    fpv02l
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    RE: unleaded head..? 2010/07/29 19:14:59 (permalink)
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    cheers shaun!!! where do i get these stainless ones from..? and also wat do i need to do to the seats...
    #10
    escortinadriver
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    RE: unleaded head..? 2010/07/29 21:10:36 (permalink)
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    For the valves, try Woz, I think you'll struggle to do any better...

    'The valves are off the shelf stainless items, 45mm and 38.3mm with wasted stems. They are from a company I deal with through work, I can supply them for $28 each+ freight,

    Cheers
    Woz'

    Have a look at the post just bellow 'Pinto build 2' http://classic-ford.org/forum/post.asp?method=Reply&TOPIC_ID=21044&FORUM_ID=7

    As for the heads, the most common method is to machine the exhaust seats, and interference fit a hardened seat. They then recut the valve seat. Just google unleaded seat conversion, theres plenty of info.

    Shaun
    #11
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