Sometime last year, someone posted an email quoting an engine builder saying that the correct 10-# for carbs on lycomings used on RVs is...... I have spent the last hour searching the forums using the key words carbs, carburetors, 10-# for carbs, carburetors, correct 10-# for RV carbs, carburetors, etc. Does anyone remember this post or by any chance the 10-# for sp 4-5 Marvel carb for an o-360 on a RV-9A. Thanks, Dan