Bigger valves actually hurt the performance of the stock heads. You dont make alot of HP with ported stock heads because they flow well. You have to keep the velocity of the air high to make up for the poor flow characteristics of the stock heads so stay with the stock valves.
Anything over .480 lift is a waste of powerband. The heads wont flow for nothing @.500 lift. A .470-.480 lift cam should do fine.
Most people just put 1.72 RR with the stock cam to achieve .480 lift.
I made over 250 RWHP when I had my stock ported and milled heads and GT-40 intake with the stock cam and rockers.
I see you already have an aftermarket cam, I would just leave it alone a cam will only help so much with stock heads.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim.
00' Lightning-Stock
88'CRX-13 second ego killer
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