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> 3 angle valve job vs. 5 angle valve job
jtmxrider
post Sep 23 2008, 08:53 PM
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can anyone explain to me why some ppl tell me that 5 angle valve jobs are more for track only cars, and why they wouldnt be very street worthy or reliable?
ive heard that if its goin to b drivin on the street more than the track then i need to go with a 3 angle....
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SiberianFirestor...
post Sep 24 2008, 12:09 AM
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For drag racing, it is worth the money. For a daily driver or a more street car, it is not worth it.

Matt


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It is better to appear stupid then to open your mouth and remove all doubt.
Steal all that you can, yet take nothing. -- Simply put, if someone is willing to teach you, then be willing to learn and appreciate it.

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Me Too
post Sep 26 2008, 12:22 AM
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It's the width of the seat that determines which is better for street or strip. Obviously for the street and valve sealing longevity you want the widest seat possible, so a three angle is considered the best. However, with a 5 angle job, the air transistions more smoothly around the valve head and that makes a bit more horsepower, but the valve sealing over the long haul isn't as good.

A wider seat transfers heat from the valve head to the head better. GM uses a single cut, the head is 45 degrees and the valve is 46 degrees, a three angle valve job will add horsepower over this arrangement and will give acceptable life, but the GM single cut will last longer. Honda uses a three angle on all of its engines, and gets maybe 250,000 miles out of a valve job. With a high quality valve, such as a Feria 6000 series, or Manley Pro-Flow, it doesn't seem to make any difference how many angles are cut.

I'd go with a three angle for the street and using stock valves.
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