I'm having trouble trying to get my 340 timed properly. When I go to set full advance near 38 BTDC at 4000 rpms, the car does not want to idle well near 15. When I do get it to idle, it backfires and coughs flames when trying to start the motor. That is with the vacuum advance connected to manifold vacuum trying to get more advanced idle timing while limiting full advance. When I advance timing to get good idle speed and easy starting, full advance goes to 60 and beyond.
The motor has unknown pistons,I believe they are stock height. An early set of Edelbrock performer heads, the .508 lift hydraulic purple shaft, a torker 340 single plane manifold, mopar performance distributer. The PO claimed difficulty setting timing and carb issues before he let it sit for 8 years and then sold it to me. The motor had a barry grant 750 double pumper race carb. Since it was leaking and had been sitting for years I replaced it with a recently rebuilt 4160 type holley (600 cfm) just to see if I can get it running decent. Also, the exhaust is fairly restrictive 2.5" to 2.25" dual.
Any ideas what I should try next or ideas on how best to tune this set-up?
Thanks,
PJ
The motor has unknown pistons,I believe they are stock height. An early set of Edelbrock performer heads, the .508 lift hydraulic purple shaft, a torker 340 single plane manifold, mopar performance distributer. The PO claimed difficulty setting timing and carb issues before he let it sit for 8 years and then sold it to me. The motor had a barry grant 750 double pumper race carb. Since it was leaking and had been sitting for years I replaced it with a recently rebuilt 4160 type holley (600 cfm) just to see if I can get it running decent. Also, the exhaust is fairly restrictive 2.5" to 2.25" dual.
Any ideas what I should try next or ideas on how best to tune this set-up?
Thanks,
PJ