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Old 10-07-2002, 08:14 PM
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Question sbc heads &casting #'s

my impala is running a 67 327 block 3903352
i also have 69-76 heads 3927186. after checking my casting # book, reading some posts here and checking some of the sites that are referenced here i'm wondering just how good these heads are. There seems to be a wide range of applications for each casting number. there are a few references to the sb302 motor that i have read about here, on one hand it is possible that i have a great set of heads but in my case i'm ussually disapointed. so my question is what do you think of these heads? and is there any other way to narrow this down while they are still on the block? i'm thinking of a mild winter rebuild. any and all opinions are welcome. thanks. <img src="confused.gif" border="0">

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Old 10-07-2002, 10:08 PM
E.T. divided by $ spent= Speed
 
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If they have double humps ther good heads,do they??
Go to <a href="http://www.google.com" target="_blank">www.google.com</a> and search for small block chevy heads flow #s.Someere I found a site that has all sorts of flow #s from like Car Craft and Hotrod etc...Ever thing from double humps to after market to 882s.They tell you in a chart how much cfm each head flows and at lifts from .100-.600 in .100 increments.Don't remember the site but try to find it it was a great site.Also think I got ther by searching for 882 heads flow #s so try that.
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Old 10-08-2002, 06:39 AM
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The 186 double hump head is an excellent factory cylinder head. It's closed combustion chamber offers around 20 extra horsepower over it's open chamber counterparts. If you are careful, and do a little pocket porting, blending the bowl into the seat area, and streamlining the guide bosses, you will have a good flowing set of heads cheap.
These are the same basic casting used on the 302 Z-28, and the 70 LT-1, so they are well suited for some good performance.

[ October 08, 2002: Message edited by: NAIRB ]</p>
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Old 10-09-2002, 07:05 PM
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thanks for the input guys it's good to know that they have some potential
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