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Location:
Montrose, VIC
Registered:
May 2002
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7M valves, 4A head
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Mon, 09 August 2004 12:30
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Putting 7MG valves into a 4AG head - any here done it (Bill??)? How did it go, what did the guides etc. cost, any issues to be aware of? 
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Club Member
Location:
sydney
Registered:
May 2002
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Re: 7M valves, 4A head
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Tue, 10 August 2004 06:20
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yeah ive been wondering about this too, ive heard 3S ones will work as well.
maybe if we can scavenge some 7M valves i can test fit in a head i have here?
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Location:
Lost in the K hole
Registered:
May 2002
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Re: 7M valves, 4A head
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Tue, 10 August 2004 09:31
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ive got enough 7M valves here (IN and EX) to sink a manly ferry... if anyone wants them, drop me a line
cheers
ed
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Location:
Wollongong, NSW
Registered:
April 2004
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Re: 7M valves, 4A head
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Tue, 10 August 2004 10:33
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Apparently the 7mg valve stems are about 2mm shorter than the 4ag valves so you have to run thicker shims. If you haven't ported the head and are running big cams then there is no point. But you probably have done that stuff already.
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Club Member
Location:
sydney
Registered:
May 2002
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Re: 7M valves, 4A head
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Tue, 10 August 2004 10:42
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2mm is a big jump in shims! youd want to make sure they have a compatible thickness, there are only about 32 odd sizes from memory, all 0.05mm difference between each size
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: 7M valves, 4A head
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Wed, 11 August 2004 02:20
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just buy oversized 4ag stainless ones. some of the cheaper ones are only $18 each. or standard size if you dont want to seats and guides.
mick
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