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Old 02-17-2004, 07:38 AM
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cylinder head question

I'm running a class where you're supposed to run stock GM heads, 194/150. There is also a claim rule of $500, and a swap. They say no porting, or polishing. So my plans are to run a stock set of 487's. But I have a feeling that everyone else won't. So in the meantime I have a stock set of 441's, and wondering if without putting any money in them, if I myself could do some mild work with a die grinder on some casting flaws, or something. Would anything like that get some more horsepower?

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Old 02-17-2004, 08:40 AM
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Run any of the double hump heads 461,462,186,291,370 they will give you good flow also run as much compression as you can if you are in a 2bbl class that they will allowed you to run.



mike
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Old 02-17-2004, 08:42 AM
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We're only allowed 441, 487, 993, 882, 624, 997, 445, 185's.
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Old 02-17-2004, 08:44 AM
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go with the 487 heads then.they are the better out of those bunch
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Old 02-17-2004, 10:00 AM
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My question is what I can do to them myself with a die grinder to make them a little better than stock?
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Old 02-17-2004, 10:22 AM
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Open up the area directly above the valves. There are some casting lines that can be removed to improve flow.

Vince
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Old 02-17-2004, 11:38 PM
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I agree, unshroud the valves.
http://www.geocities.com/jjonibones/Shrouding.html

Also smooth out the short turn radiuses.
http://www.reincarnation-automotive....rn-page-5.html


http://www.sa-motorsports.com/diyport.htm
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Old 02-17-2004, 11:42 PM
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...and no cheating.
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Old 02-18-2004, 09:21 PM
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Old 02-18-2004, 09:45 PM
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Quote:
Originally posted by Rogers Performance
go with the 487 heads then.they are the better out of those bunch
Why are the 487 heads better then the 993s?

by the way I've had trouble finding good info on GM heads. one
site will have different info then another site, wich one do I go by?
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