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Old 04-23-2013, 04:38 PM
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sbc 350 timing issues

hi all, I may have a very stupid question. I am a little green with engine mods and tuning, I just replace a defective harmonic balancer on my 350 chevy. it completly cam apart, I installed a oem 8 inch ballancer and the engine started right up no prob, runs good and goes good but my problem is when i try timing it, i let it worm up, pulled and pluged vacum advance and the timing mark is about 2 inchs away from my timing tab. so my question is , is ther something off in side the moter like distributer, timing chain ex. I turn the distributer untill the timing mark is at the tab but it runs like crap, some help would be great, im sure it is something simple and will just make me look supid but I dont want to go tring different stuff blinded thank for the help

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Old 04-23-2013, 07:09 PM
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a lot of times there are so many different applications for gm timing covers that have timing locator in different locations, from top to right side of block.
however make sure you have the proper balancer for the engine, and if you have to buy a bolt on timing locator, good luck
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Old 04-23-2013, 09:01 PM
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what year sb is it
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Old 04-24-2013, 07:04 AM
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timing

not up on all chebbie motors, so i'll assume some marks are different by yrs built.. but for me 60's to 70's engines the TDC mark will be at about 2 o'clock. manually turn it over and see where it comes up.. wondering if u can tell where the outer ring on the old bal compared to the key way and look at the new one and compare that..
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Old 04-24-2013, 07:24 AM
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have you had the timing cover off and checked cam and crank timing marks. the crank mark should be at the 12 o'clock position and the cam at the 6 o'clock position. what distbuator do you have (points,hei,ect)
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Old 04-24-2013, 03:02 PM
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Depending what year the 350 is. The timing may be set 2 o'clock for the early 350 and 12 o'clock for later 350. Some timing marks are welded to cover others are bolted.
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Old 04-24-2013, 08:22 PM
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no. i mean then timing gears under the cover. just to make sure it didn't jump a tooth off. the marks your thinking off set distubator timing. the two dots one on each gear set base timing.
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