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Discussion Starter #1
Anybody know how big of valves you can cut the stock seats for? I see that alot of people have plus 1.5mm. Is that the biggest you can go without having new seats installed? Thanks for any replies
 

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Not sure about that, I have plus 4mm but had new seats, You can call Glenn at AMR (330-347-6800 or you can call Mickey at FST (814-842-6159) they can tell you for sure.
 

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Discussion Starter #4
I'm running an 840 with JE pistons and they have valve reliefs big enough for plus 2mm valves is why I'm curious. The heads have been hand ported but i still have stock valves. bigdaddy did you get a set of plus 4mm cnc heads from FST? Are you happy with them and how much, if you don't mind me asking?
 
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