Finally got my 289 all sorted out with a new edelbrock carb, performer RPM cam, and gt40p heads. The only issue left is that of ignition timing. The car seems to run fine at around 14* initial, but there is 0 power from idle which is expected with this cam. However, if I advance the initial to something like 20*, the low end is a lot stronger and the car seems to pull great. The added initial timing also smoothes out the idle, and I put the vacuum advance on manifold, which gives it a lot of initial timing at idle.
How much timing is too much? I've gotten this car started with 40* initial and it ran ok. I always use premium, and the engine is a C code so I think the compression is a little less than the hotter variety 289's.
Whatever the dizzy mechanical advance is on (13L) should give me another 26 degrees of timing, for a total of around 46 total. Car seems to run fine up to 5500 rpm, no detonation or pinging or anything
The harmonic balancer is new, the cam was installed so that the timing marks on the gears lined up, and the distributor is a remanufactured 289 stock replacement with a Pertronix drop in and coil.
How much timing is too much? I've gotten this car started with 40* initial and it ran ok. I always use premium, and the engine is a C code so I think the compression is a little less than the hotter variety 289's.
Whatever the dizzy mechanical advance is on (13L) should give me another 26 degrees of timing, for a total of around 46 total. Car seems to run fine up to 5500 rpm, no detonation or pinging or anything
The harmonic balancer is new, the cam was installed so that the timing marks on the gears lined up, and the distributor is a remanufactured 289 stock replacement with a Pertronix drop in and coil.