Tom.. The 1405 carb.. is close for a mild 350 out of the Box...With the O2 sensor ( COOL ) I assume you have a mechanical full pump... if that is the case and it's a Hi out put. you can over power the needles in the AFB/Edelbrock type carbs. They only like 6 t o7 psi ..
. At a idle is the a " POP" in the header ?? Another problem I have run into in NEW installations.. is dirt- sediment getting in to the metering fuel deliver circuit ... Cross fire on New Wires !!! can, but most likely NOT... I would double check my firing order..timing and Points,, the obvious spring and mech advance on the Distributor .. then start on the full delivery sys.. then the carb,, The Carb came with a tuning chart,, also there web page has good info... GL Wayne ACES # 1556 TCG # 186 ----- Original Message ----- From: "Tom Tomlinson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, June 02, 2003 8:21 PM Subject: [Chevelle-List] Rich Edelbrock Carb > Last week I started up my 350 Malibu after installation of a new Edelbrock > 2701 intake manifold, 1405 carb, Sanderson headers. The good news is, there > are no external leaks of water, oil, or exhaust. The bad news is, after > adjusting dwell and timing, I find the car "pops" in the header when > accelerating and decelerating. I installed an O2 sensor to help with tuning, > and it's telling me the mixture is rich (O2 sensor reading > 900mv), so I > suspect extra gas is igniting in the header. I'm disappointed because the > intake/carb combo are supposed to be "matched" and run "right out of the > box". The engine has stock heads and ignition, and a modified cam of unknown > spec (the previous owner said "it was a 350 HP cam with nothing above 5k > rpm"). > > - Has anyone else noticed an overly rich 1405 upon initial installation? > - can the cam have a dramatic effect on A/F mixture? > - is there an easy way to check for ignition cross-fire (I made new plug > wires and they could be part of the problem). > > Tom Tomlinson > '71 Malibu > > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED] > > ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
