02GF74
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| posted on 17/4/09 at 11:12 AM |
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ford crossflow vavle query
Is there a way you can tell if there is room to fit 34.9 mm exhaust and 41.3 mm inleat to ford crossflow head and have unleaded exhaust inserts?
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clairetoo
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| posted on 17/4/09 at 03:37 PM |
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Try it and see if it holds together 
One trick used on drag bike heads was a sort of spectacle shaped valve seat insert to do both inlet valve seats in an ally four valve head when the
valves are too close together - or even a complete combustion chamber made of ally bronze (suitable seat material for stainless or titanium valves  )
I think you will have problems with cracking and the inserts falling out - there is very little room between the valves when you go that big in a
crossflow without re-machining the guides to move the valves further apart .
[Edited on 17/4/09 by clairetoo]
Its cuz I is blond , innit
Claire xx
Will weld for food......
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rusty nuts
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| posted on 17/4/09 at 07:17 PM |
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Burtons list a full race head for unleaded with 41.3mm inlets and 34.9mm exhaust but it may be that the valve guide centers have been moved to make
more room.
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02GF74
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| posted on 17/4/09 at 09:26 PM |
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okey dokey.
mcahining a hole to offset the guides should be no more difficult than to put them in the original spot .... but depending on how far t hey are moved,
the sprint seat may need to be machined too - not so easy.
oh well, may need to look at slightly smaller inlets, burton power has the 41.3 mm as the cheapest 
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clairetoo
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| posted on 18/4/09 at 08:18 PM |
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Machining spring seats isnt as hard as it may sound - I made a tool when I was doing a lot of crossflow heads for the the job (must still be in the
shed somewhere.......)
I allso made a cutter for machining the valve throats when fitting oversize valves - made porting a lot easier
Its cuz I is blond , innit
Claire xx
Will weld for food......
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