http://popularhotrodding.com/enginem...509phr_383wnd/

 

That seems about normal to me. I'm an old carb guy so me only having a 216/224 114 seems tiny to me, but I'm also used to 400+cubes. This little 293 of mine kills me. I consider a 252/258 110 solid roller a street cam.

 

I was just surprised to see + overlap @ .050. That engine is a screamer, and really, a more traditional roots blower than the Radix, and using the less efficient top to bottom flow path, no intercooler and pretty good/low IAT's

 

The 383 cubes is more forgiving than a 5.3 to overlap. The larger cylinders just arn't effected as much. An example of that is a guy I work with built a 496ci big block chevy and put a 224/234 110 cam in it. It's idle sounds stock. The lower than expected IAT's are partially a result of what a larger blower can do for you that you don't have the spin the crap out of it to get descent boost on a larger motor, the other is the cooling effect of the carburetor. Carbureted engines cool the intake charge as the fuel is evaporating, much like meth injection does. That is why on a blow through carb set-up you can get away without running an intercooler. It isn't quite as good of cooling as an optimized intercooler but close. Multiport injection motors don't have time to cool the charge with the fuel due to it mostly vaporizing after it reaches the cyl. Procharger has done many tests on this with their blow through carb set-ups.