I'm going to be ready to install my Super Ram Runners onto my new engine soon, and I'll probably put the plenum on with a few fastners so I can get some good pics. Anyway here is my question. I noticed that the inside of the runners and the plenum, as well as the ports on my Edelbrock intake are all pretty rough. Would it be beneficial to polish these walls smooth, or does the roughness help "swirl" the intake charge? ------------------ Riccioli Performance Motorworks --RPM Racing-- -Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, either AFR or Trick Flow heads, MSD ignition. -Will be installing Baer Brakes -Will be installing full Spohn suspension in rear -Art Carr 700R4 trans?? ***** Flyby: (n) When you let off the throttle after beating a ***** Racer by a few car lengths and he then blows by you in an attempt to convince you he really won the race.

Paul,

Unless the air travelling through the intake is at or near supersonic velocities (and it isn't) there is no real benefit from polishing the inside of the surfaces. Since the industion system is dry (no feul mixed with air at the opening) there is no real benefit to the rough surface, but no real detriment either. This is unlike combustion chambers and exhaust ports, where a high polish can be beneficial by retarding carbon formation and reflecting heat fdrom the heads.

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Later,
Vader
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