Does it matter ,Oversized valves ??

[Bmjpv]

I've been around and Not a newbe. I'm re/rebuilding my 97' s52 for my street eddriven 88' M3. I'd like to hear from bmw members who have real knowledge about installing the +1mm or +2mm oversized intake/valves that are on the market.ALREADY HAVE, NA s52 w/sport schrick cams,Vac double valve spring/retainers ,adjusted compression ratio 11.0cr, 240mm m5 clutch w/ getrag 6sp and a 3:25 in the rear. Yes I know intake/exhaust are a major factor. Head work is alway key to HP but does this mod really give a dyno return? Please keep comments positive and on subject. Thanks , Joe

[Bmjpv]

bump

[acolella76]

I imagine you would really need to open up the combustion chambers, the stock valves are shrouded as it is. You could definitely get some more horsepower out of it, but I'm not sure the cost of all the machine work would be worth it. I could be wrong though.

[digger]

sometimes a bigger valve allows a better shaped short side which can be very beneficial for stability and air speed over the turn not just extra area. i would speak to a head porter with experience in the the head in question.

[nrubenstein]

For that kind of money, why the hell wouldn't you just go S54?