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302 heads are a good, cheap way to get a little more hp and they are closed chambered which is a good way to bump compression. The 308 head is the same head but had bigger valves. these were used on the 360's. these heads are good performers with mild porting. 
#08 heads are most definately NOT the same as 302's with larger valves, not even close. 308's are 360 type heads with all that entails, not 318 heads with bigger valves.
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