Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

BBC timing ?'s

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Old Nov 6, 2013 | 09:12 PM
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Default BBC timing ?'s

I have a 489 in my late wifes 71 Camaro. It has about 10.5:1, Bullet solid roller I/E .686 and 255/266 @ .050. Has Brodix Big Brodie oval ports aluminum heads. We were running 110 octane at 36 degrees timing. I am now going to run premium 93 octane, was just wondering about how much timing I should run. I have it set a 28. This is total locked out. At $8.50 vs. $3.25 a gallon, I'm not in it to go fast any more, I just want to have fun. And win some rounds. This is a bracket car.
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Old Nov 6, 2013 | 09:50 PM
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28 degrees may be a little too conservative. At 10.5 compression, with that cam and aluminum heads, I would think you could safely run 32-34 degrees on 93 octane.
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Old Nov 6, 2013 | 10:59 PM
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36-38 no problem on it. Mine and a few buddies with similar combos all on pump 91. Bbc love timing.
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Old Nov 7, 2013 | 12:21 AM
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I agree you should be ok at full timing (36 deg)
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Old Nov 7, 2013 | 06:52 AM
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I was reading a CC article after I posted last night. They did a comparison on a 388 SBC, one with iron heads ond one with aluminum heads. They both made the same (within about 10) HP on pump gas with around 36. Guess I need to go ahead and bump it back up to around 34 and see what happens.
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