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#2
07-13-2018, 06:21 AM
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A more important question might be what heat range you need in whatever brand plug you use which is determined by how much HP you think the motor will make?
I have ported 2 sets of these Heads and the 288 Intake cfm that they are said to flow out of the box was not showing up on my bench with both sets of heads! Let's say that things have changed and they do now flow 288 out of the box and let's assume your running enough valve lift to average 275 cfm out of that 288, so 275 cfm could make you 565 hp in a well thought out motor and in terms of a AC Delco brand plug I would start off with a plug of a 42 heat range with a extended tip for a base line.
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