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Originally Posted by nvawgn
i'm in the process of getting a motor built for the wagon but i will eventially want to throw a super charger on it.
so my question is, if you were building a supercharged motor, 383 or 406 out of a 350 or a 400 gm block( i can not afford an after market block) to run on max 10lbs of boost on a primarily street driven car, what kind of facts do you need to know before starting your build?
i'm trying to figure out what kind of bottom end i need, parts and pieces, splayed caps, super light rotating assembly vs. regular 4340, 6in rod vs. 5.7in rod, which piston, bearings.
please tell me the info you need to know, thanks
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splayed caps are nice depending on the block, but not necessary at that level. I would definitely do ARP studs on the bottom end. On the 400's I've done I do a partial block fill which helps keep things from moving, haven't had any cooling issues either.
As far as a rotating assembly I've had good luck with the more reasonably priced Eagle and Scat 4340 stuff with good rod bolts, at that power level. I do like to use a designated blower piston with a thicker top and lowered ring pack. That also usually gets me away from 6" rods, unless they fit without getting into the oil ring. I like the plasma moly rings, file-fit, so I can get the end gaps right and they seat immediately. The Eagle/Scat cranks generally need H bearings (I use Clevite from Speed Pro, TRW, etc.), made the wider fillet radius in those cranks. They're harder than the standard P clevites, and work great in a performance application.
I would recommend a blower-specific cam also, with the wider lsa like 114 or so, as they'll build boost faster which is what you want in a good street build.
Jody