"Food for thought............" ALANIZ recomends using stock valves on all normally aspirated B16, GSR heads. Our flowbench testing has shown .5mm oversize valves dont work no matter who I get them from. I also gave them a fair chance trying diffrent seat angles and widths with no positive results. At mid to high lifts we see about 2% less flow than a well modified stock valve. Any one who has flowbench tested a B16 or GSR should know this. Oversize valves breath better at lower lifts if modified correctley. Please remember this is not a DART, ARF, 18 DEG BOW TIE, OR A BRODIX. Many people who work on AMARICAN IRON HEADS apply technics that might work well on Chevy's and Fords but fail to realize that if you have done flowbench testing on Honda heads you'de think twice about going this route. Dont be suckerd! We only sell SS oversize valves in turbo and nitrous applications where high heat will be encountered or in instances where oversize valves responded well on the flow bench. We never guess at what we do. Monkey see monkey do attitudes or I heard it through the grapevine mentalities are a NO NO! Hard facts and flow numbers is what we are about.