10-11-2007
Will,
You've probably seen this, but Carobu did a 412 and were happy to see 406Hp at 6400 rpm. That is with webers, so I'd guess 430 or so with EFI. Looking at the dyno graph, the engine is very clearly flow limited, which could be heads, carbs, cams, exhaust. The exhaust looks about right, the carbs are a part of the problem I'm sure, The cams are about as big as I'd go on a street engine...maybe another 5 degrees.
The heads though....the right flow for an engine that size with a 7700 redline is about 120-130 cfm at 10" water, or 205-220 at 28" water, if the heads hit these numbers, the engine with the cam it has would be making about 500-550 hp at 7200-7500 I think.
http://www.carobu.com/html/ferrari_365_c_4.htmlThey ported the heads and got them up to 13%....to not quite as good as stock 308QV heads. This build is really the main source of my concern. Do you know of a 400/412 engine that been dyno'd and made up it the 500s?
Mark