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Originally Posted by olddog
I do not recall any talk on what the timing and AFR is now, when skimming through this thread. You need enough fuel to not detonate, but not a lot more than that (some safety margin). After that the timing is where the power is at. You could easily loose a 100 Hp if the timing is not right. A gummed up mechanical advance in the distributor could be the problem.
PS
Pull the vacuum line (plug it) rev it from 2500 - 4000 and see where it quits advancing and what that timing is. Once it quits advancing, no need to rev any higher. If you are under 32 that is likely your problem and your engine may need as much as 36. The best way to find out how much timing makes the most power is on a dyno. Some engines make the most power at 30 others 38, it has a lot to do with the head design and compression, etc. I would guess your engine to need 34-36.
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When the car was tuned the tuner did exaclty as you described......I would say a good 3-4 hours was spent tweaking the carb and making timing adjustments while on the dyno.
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Olddog,they did do that, they changed jets and tried difference timing setting for 3-4 hours on the chasis dyno.....they seem to have gotten the most they could out of the engine as it is now......
David