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Old 01-05-2004, 09:34 AM
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32v heads worth it?

http://www.araoengineering.com/Chevy/chvysmb2.htm
sells 32V heads for v8's.
has anyone heard anything good or bad about them?

I was think they would be cool to put on a chevy 302.


marcus

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Old 01-05-2004, 11:58 AM
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I am not sure what types of gains you will see on a single cam motor with 4 valves per cylinder. Usually this is used with DOHC engines.

You will get more revs, but I would assume a loss of low end torque. Think of a 16 valve DOHC Honda engine.... lots of revs, good top end power, no torque at all.

Sounds awfully complicated to me.....
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Old 01-05-2004, 12:24 PM
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more valves is always better because the area of a circle isn't efficient to give the maximum use of area, yet it provides the best surface for allowing fuel-air to charge by. By having more, smaller valves you have a couple of advantages over two valve heads. First, you use more total valve area. So your heads flow like 2.25 or larger valves because the area is more total. Secondly, you partly dissipate the disadvantages of using larger valves (loss of low-end power due to slow fuel-air velocity) because the valves are smaller and keep the charge velocity up. Lastly, if you can arm these heads with a roller cam, you'll increase the ramp speeds and most probably see some really dramatic changes in performance. If you have time and money it would be a really fun project. How many 32v SBC's are there? YOu would have a one-of-a-kind motor! Sounds awesome, definitely worth your time and research at the very least.

Hope that helps-

K
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Old 01-05-2004, 04:57 PM
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well It would have more low end than a 4 banger which is what counts. I would mate it to a 5-speed in back a fiero so it can't be to torquey as the fiero trans is rated for around 200 foot pounds. thats one reason to make it rev and not have too much low end. also light car =not as much torque needed to get going. I love low end torque but I have my turbo v6 for that.


marcus
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Old 01-05-2004, 05:39 PM
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I would think that the cost of these things, plus all the extra moving parts, would make these heads impractical.
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Old 01-05-2004, 06:02 PM
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They are way too big to even consider on the street. Those Arao heads have been out since the '80s. Those are for race use only.

Those heads would swallow a 302 Chevy alive.
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Old 01-05-2004, 07:35 PM
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what makes them not streetable?
no low down torque?


marcus
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Old 01-05-2004, 07:41 PM
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Too much airflow at low RPMs kills torque.
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