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Old 05-28-2012, 07:05 PM
reyes134 reyes134 is offline
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new cam wont idle sbc

hey guys...I got a 68 Impala w/ a 350 V8, TH-400, and 4bbl carb. I wanted to add some horsepower and underwent my first engine build. I put a new cam/intake/carb combo (Edelbrock 2102/2101/1901). I broke in the cam but you have to give it gas or the engine just dies out. Starts up cold good (2-3 minutes), but as engine warms and cold choke opens, the min. rpm's it will operate is 1500 without stalling/dying. Can't get it to idle like before...so I am stumped. I lined dot-dot during install, then rotated crank 360 before putting in dizzy. I adj. valves, put new exhaust springs and valve seals. I recently took out dizzy again, added accel point eliminating kit, found tdc w/ thumb, and installed dizzy. Same problem, cant time since it dies as I try to adjust dist. cap and bring near tdc. The closest timing is >14 ATDC when it first starts. Did I need to degree the cam before installing? I put a edelbrock timing chain set during cam install and instructions said straight up timing is achieved. Any help appreciated, thanks!

Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: Idle-5,500
Intake Duration at 050 inch Lift: 204
Exhaust Duration at 050 inch Lift: 214
Duration at 050 inch Lift: 204 int./214 exh.
Advertised Intake Duration: 278
Advertised Exhaust Duration: 288
Advertised Duration: 278 int./288 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.420 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.442 in.
Valve Lift with Factory Rocker Arm Ratio: 0.420 int./0.442 exh.
Lobe Separation (degrees): 112
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