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Does anyone know what the cc of the heads on a xlt is. just the heads not the cylinders. i heard it was 20cc and i know the heads from slp are 21.5cc. if the stock heads are 20cc then how can these heads add power if it is lowering the compression?
 

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Not all SLP heads are the same cc There are sets for stock port,trail port and full mod.All have different elevations.I have the earlier catalog with all heads listed and cc depending on head and shims used cc,s range from 12.5cc-20cc.Some from what I understand are no longer available nd are hard to find.Performance guys would use smaller hi altt.to bump up compression ratio! Thats what I did.Works really well but premium fuel should be used or colder plug range.The web site is not listing all part #s The heads Im using are not there,must be discontiued.
 
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