Originally Posted by Eric64
Hope someone can give me suggestions, New carb new engine 17" vacuum total timing 30deg. 350 sbc RV cam performer intake. Float set 7/16 fuel pressure 5# stock jetting and springs way lean pinging all over the place. Ended up with changing the rods to the 70/37 from the stock,changed twice to get there pretty good at least the pinging went away. Had a narrow band A/F meter on when stock (75/47) and it wouldn't hardly move off from the lean stop of the meter. with the 70/37's it is running just below the middle portion of the meter, changed the primary jets to 101's from the stock 98's and it did raise the reading slightly towards rich. I put the stock 98's in the secondaries to see if that would work the wide open portion but goes way lean. before I go much further I wanted to see if anyone had any thoughts. Really it runs so much better than it did I know I'm at least moving in the right direction but it seems odd that it was that lean from the factory and my engine isn't anything fancy. Thanks for any thoughts. Eric
Don't forget the step up springs. They will act like a Holley power valve to richen the air/fuel mixture when the engine is under a load. Tailor them so the enrichment comes in sooner.
Once you get a hold of the carb, you will want to add timing most likely.