As per the topic really, I'm curious to know what people have found with Schrick 284 cams, and how much timing extremities you've gone too with VANOS throws. It seems to me, that most maps for a standard engine use between 5 degrees and 55 degrees on the inlet cam, and perhaps 5 through 40 on the exhaust cam. Reason for asking this, is I have VAC head with oversize valves on inlet and exhaust, and with the kinda of throws that are normally used on a standard set of cams, would render the valves awfully close to fouling when using anything with longer durations. To 'play safe' with this engine build (VAC 3.4 Stroker), I figure I should either set up the cams so that the inlet cam max advance is about 40 degrees, or set the exhaust cam to a minimum of about 8 or 9 degrees. In either of these scenarios, the valves will clear each other without any risks. My thinking is though, that with the exhaust set as above, maybe the idle quality and emissions will be adversely affected, or in the case of the inlet being restricted, maybe mid band/mid throttle performance will not be so good. That said, maybe the longer duration kinda negates the need for so much advance anyway? I know there are one or two seriously clued up guys on here, so am curious to know what experiences you've had with 284 cams, and timings (assuming standard size valves, and full advance can be used). Mike.