Originally posted by bnoon:
Originally posted by warmonger:
no
 I had no problems with 3/8" tubing on mine when I ran the aluminum 3L UIM... I tapped the bottom of the stock IAC for two 1/4" threaded to 3/8" barbed adapters and it idled nice and smooth all year round.
Okay then yes. 
I'd think that without any you wouldn't want to drop a 5/8" tube down to a 3/8". I suppose it depends on everything from pcv size and air leakage at the throttlebody. I always sealed everything on my TB, including the small centerhole so I kept the stock sized IAC line.
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