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im rebuilding a d16y8 head and bought brand new valves, springs, retainer and just wanting to know what is the purpose of a vavle guide?
i also plan on going turbo...is it better to have??

thanks
 

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89 ed
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Wikipedia English - The Free Encyclopedia
Valve guide
In most types of reciprocating piston engines, a valve guide is provided for each valve in the cylinder head. Along with the valve spring, it serves to positively locate the valve so that it may make proper contact with the valve seat. A valve guide is a tube-shaped piece of metal, pressed into the cylinder head, with the valve reciprocating inside it. Guides serve also to conduct heat from the combustion process out from the exhaust valve and into the cylinder head where it may be taken up by the cooling system. Bronze is commonly used, as is steel; a balance between stiffness and wear on the valve is essential to achieve a useful service life.
 

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^^ That's what it is and what it does. You already have them in your head. Check them and see how much wear is on them by placing your valve about 1/2" out and give it a wiggle. If its really loose and yours wiggles all over then replace them. If your valve manufacturer recommends a certain material/valve guide, then go ahead have them pressed in anyhoo
 

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EK 96
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the best thing is to have a good machine shop check the head. Dont tell them about your valve guide ? He will tell you if they are bad if he is a good one...So he wont have to do the job again...The better the valve guides R the better the valve will open or close...If U doo a angle job on the valve better for it....And iff going turbo new valve guide will be great if they R in bad shape.
 
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