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Correct timing setting for a 1970 350 (9.1:1 w/ HEI)

Discussion in 'The Garage' started by BillyTungsten, Dec 4, 2005.

  1. BillyTungsten

    BillyTungsten Registered Member

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    Engine is running (after swap) but I get a wicked backfire coming off the throttle and overall power is lower than it should be. I bought a timing light yesterday, but have never timed an engine.

    Anyone know where I should be from TDC? Any other general advice on correct timing is also appreciated!
     
  2. unclematty

    unclematty 1/2 ton status

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    need some more info from your end, what cam are you running, carbed or tbi or tpi, egr or not, I'll get back to you as soon as I see info :D
     
  3. 3 on the tree

    3 on the tree 1/2 ton status

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    I would start at 8 degrees BEFORE TDC, as a baseline. Don't forget to unhook and plug your vac advance line while setting the timing.
     
  4. BillyTungsten

    BillyTungsten Registered Member

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    more info & pics...

    The engine is from my 1973 blazer, PO told me it was a 1970 350. I do not believe the cam is anything but stock, as the PO had a pretty flowery list of anything that wasn't stock.

    It is carburated


    One of those hoses is the vac advance that I need to plug, right?

    Also, this is what the timing mark looks like...

    which is 'before' versus 'after' to the left of the mark or the right as I face the engine?

    Thanks! I am learning thanks to you guys!

    carb-small.jpg

    timing-mark-small.jpg
     
  5. SUBFAN

    SUBFAN 1/2 ton status

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    See the pot on the distributer under/behind the fuel inlet on the carb? That is the vacuum advance. Simply pull that hose off, and plug it.

    On the timing mark, to the right of 0 is the advance side, I do believe. (Been awhile)

    Although looking at it, I think the A stands for advance, and the R stands for retarded.... :confused:
     
  6. BillyTungsten

    BillyTungsten Registered Member

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    TTT...

    I am waiting for some info so I can get this done... I don't want to put the PS pump in until it is timed, so I am kind off hung up until someone helps with timing info.
     
  7. SUBFAN

    SUBFAN 1/2 ton status

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    Put that PS pump on there, you can still time it with it in place....
     

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