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Old 12-17-2002, 05:09 PM
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Red face vortec heads and compression

I am in the process of rebuilding my 350 and have come to the question of heads. I am really interested in the aftermarket Vortec heads by GM. The problem I'm having is that with the pistons I put in, the manufacturer says I should get 9.39:1 compression with the 64cc chambers. I am just wondering if this is too much to run regular pump fuel in my motor. I have an Edelbrock cam (.420 Int & .442 Exh), Edelbrock performer intake and an Edelbrock 600 cfm carb. I keep getting varying opinions about this and any good suggestions would be much appreciated. <img src="confused.gif" border="0">

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Old 12-17-2002, 05:37 PM
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on 93 octane pump gas you should be fine, if in any doubt, you can run a thicker head gasket to lower to compression slightly, but I wouldn`t do so unless I had to.
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Old 12-17-2002, 06:07 PM
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It depends on how much overlap you will have in your cam, more will reduce the compression. Also the elevation you will be running at, the higher is better. However, I am at sea level and run 10.3:1 with a mid level cam and do not have problem on high octane pump. Do not compensate by putting a fat head gasket in there. You want a real tight quench area so that you can dissallow detonation.
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