Base timing ? 455

Discussion in 'Tips On Using The Board' started by smar, Sep 12, 2013.

  1. smar

    smar Well-Known Member

    I need a little help I'm working on a freshly rebuilt 71-72 464 8.75-1 CR. performer intake & 750 carb, T/A headers, stock heads, T/A cam 288-294 advanced 4 deg. (using T/A timing gear set) in a 70 skylark. It don't even want to start with out at least 20 deg. base timing but seems to run strong with 25 deg. base so off I know the CR is low for the size cam and I know that lower CR. engines like more timing BUT 25 deg.!!! and also going not wanting to start to running strong with just a 5 deg. change. Other info is it has a new balancer, the distributor is a factory point type with a Mallory HEI. conversion with re curve kit (limit bushing and the lightest springs installed also I made a stop for the vacuum advance unit limited to 10 deg. and I run it to full manifold vacuum. when I check the timing the engine is warmed up with the vacuum line removed and plugged idle at 600-700 in park. I know that every engines timing is different but 25 deg. normal for this kind off set up. Also by chance did advancing the cam 4 deg. do anything to the base timing. Or am I just overthinking this to much. Thanks in Advance to Everyone.
  2. carmantx

    carmantx Never Surrender

    Welcome to the forum.
    Search for Larry's power timing thread sticky and it will help.

    Most of us with the race/street 455's are running 32-34 total timing with all in by 2000-2500. I don't even check my base timing at idle.
  3. smar

    smar Well-Known Member

    Thanks for the welcome. I'm so glad I found this place. I will check out that thread. I just thought that this was a conservative street build (aside from the cam) it advertised good for power brakes and 9-1 CR. It does have a 2000 stall converter but I still should have went a little smaller. But still it's just that 5 deg. difference in base timing that makes for a hard start to running strong with no bad habits. Again thanks for the welcome and the info.

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