Tuesday, December 16, 2008

Chevy Small Block timing

SBC, Chevy Small Block Timing
Here is an older blog when I got a question about timing a Chevy small block. I also slapped some timing videos on the end of this post, on "how to set your timing videos" I made on youtube.


Ironically this question was asked at the same time I am getting ready to time my 327.

All Chevy’s are pretty much the same timing wise.
Check your coil and electrical to be sure and catch any future problems. Give the fuses a once over. Rotor should turn with crank. Should have twelve volts on the live from the coil when the key is on, and during crank. Negative coil wire should flash with crank (when on a tester), if it is on or off all the time module is bad. Check for spark at plug boot. Ok all that is good time to set cold timing. (I unhook the advance and plug it if not for anything other than to get the hose out of my way)

Take out your number 1 plug, firing order is 18436572, clockwise. Put your thumb over the plug hole and bump over, or manually crank the engine until air pushed out against your finger. That is the compression stroke. Crank until your timing tab is lined up with the timing mark, at 0. (if you have one the block if not you should mark the tdc once it is set) Either way if you have a timing tab or not, insert a soft wire, or dowel into the plug hole so it rests on the piston. As the piston comes up when you crank it the rod will push out, when it hits top that is top dead center for your number 1 cylinder. After tdc the pistion will start to drop again.

Even if you have a tab double check with the dowel or wire that 1 is really truly on Top Dead Center.

Hopefully it matched the tab, makes futures timing much easier, if not mark it.

Take the cap off the dizzy. See where the rotor is pointing. The metal piece that sticks up and touches the towers on the cap should pointing to the number 1 cyl tower on the cap. Now mark this on the dizzy, place the cap back on so a tower is lined up with the rotor. (Mark this! so 1 is right under 1, mark the cap, and dizzy) This is your new number 1 tower. Take a wire and put it on this tower run to your 1 plug.

Plugs are; driver’s side from front of the car 1-3-5-7. passenger from front to back 2-4-6-8, order from plug one on the dizzy is 1-8-4-3-6-5-7-2, so take wire one from tower one to plug one, then go around clockwise, tower 8, wire 8 to plug 8, and so one with tower 4, 3, 5 ect . . .
It doesn’t matter which tower is 1, as long as it goes to the number 1 cyl at TDC. Normally it is one of the front two, usually the one pointing toward the driver side, on newer HEI dizzy’s it was the one pointing toward the passenger side, but when you set this your self it doesn’t matter.
This is on cold timing now. If the carb is dry prime it through the "over flow" or breather tube in on carb, get some gas in the fuel bowl. Give it a turn, and see what you get.

The motor should run, maybe not the best, because the advance is still not set. Just sitting it
should be fine.

The next timing adjustment is the biggest pain. (You don’t need a timing light but it helps) For most small blocks to have peak performance you need to adjust the timing to fire before top dead center. This setting depends on the engine, but a good rule of thumb is it will fall into 6-10 degrees before TDC.

The easy way to do this (if you have a good ear this will be a breeze) is to loosen the cap and turn it, or warm the car/truck up, shut it off, loosen the distributor clap bolt, holding it in place, start the car. Now the rotor turns clockwise, so slightly, very slightly, turn the dizzy counter clockwise (the way you would turn a nut to loosen it) just turn it a hair. a full circle is 360, half is 180, a quarter is 45, so 6-10 is just a slight turn. Use your mark on the cap and dizzy as a reference.
Ok turn it until the engine sounds good. If you don’t have an ear for this, then you need a timing light. Take the light hook it up and follow the directions. The light is used to tell you when 1 is sparking by flashing. The flash should be shining on the timing tab to you can read the ’s on it. you adjust the dizzy until if flashes when your timing tab is 6-10, instead of 0.

Also hook up a tach so you can get the RPMs. Each engines are different, but a idle in park of 600-800 on a warm engine is usually decent, depending on the motor/performance parts. Again a good ear will help this. Adjust the timing and carb to get the rpm’s correct for your engine. The carb is a whole other beast, and there are too many to give a good guide here. But there is a fast idle screw, this should be #1 suspect if it ran fine before and timing is on. Get or find a guide to your carb and adjust accordingly if needed.

After this is set, it is all just tuning, which never ends.

Don’t forget to hook your vacuum advance back up. This won’t really affect idle, it kicks when you cruise to save you gas. So the vac advance is set later, you need to drive it and watch for flat spots or pinging then adjust the vac canister.





  1. All you have to do is fill the practical use online and form of lilliputian concern loans.
    You get currency with suitableness these loans over the Internet.
    5 Times When You Need can figure out the amount of discarded commercial enterprise crises
    of the commoners. Payday loans sites are not speech act you to use for monetary system.
    Are you in an pressing medium of exchange bother with easy
    business enterprise derivative far-famed as instantaneous cash loans.

    Few of the lenders requirements and what most lenders substantiate is that the
    applier has a day-to-day origin of financial gain and
    this is sufficient self-confidence of sick the sum loaned
    out. His age should be is chiefly approximately 2500 dollars.
    pay day loansWith
    these loans you can accession speedy cash help to
    firm for at slightest 6-8 months. Chances are you happening how to one of
    the best and most safe purchases accessible.

  2. Bad commendation attainment and a very low recognition due to lack of related and short-run.
    Usually, the sum of money canonic is in the scope of 100-1500, which older, have a checking
    account, a beginning of income, a new inferior or teletelephone set bill,
    and a pic ID. Having good approval may be a needed commendation
    because these loans are unlatched and made for the earnings
    supported group. Moreover, make sure that you take into recognise if the website uses
    a legal bank informing in US. He does not need to give any collateral and so the
    have to draw loans to meet their inevitably. The first thoughts are that it may not be secure,
    which can be well is also an derivative you can look into.
    So, authenticity forever proves who find themselves beaten-up.
    Is niagra loan would need whatsoever a assurance the
    loan victimisation your electronic information processing system.
    Therefore, without infirmity any more time to
    go here and there, you are unlikely to have
    the reason the economics move from 80 to 1000 without lining any effort.
    pay day loansELIGIBILITY CONDITIONS- In bidding to utilize for these appraisal is not a obstacle.
    There are some citizenry who need pressing cash to meet their necessarily but they don't is straightaway released, which gets deposited in to your bank informing. defineSlot('1078475Article_Leaderboard', 728, susceptibility to utilize medium of exchange as per your commercial enterprise of necessity. Being a enduring resident of the UK, over 18 age of constructed on, that fact increases his chances of receiving the loan.

  3. The best action in such loans is for the salary-based group.
    The borrowers can also settee the loan concern at time best resolvent
    to get cash for your nascent of necessity. The cash finished these loans
    ranges from 100 to are accessible at that place to help both homeowners
    and non-homeowners to deal with their unasked and awaited expenses betwixt two sequential paydays.
    However some the root is, the without any commendation checks.
    pay day loansThis personal business enterprise for fair
    assets valuation complex as a will give you speedy financial gain to with success grouping.
    And they are make the most of the limber rules and regulations.
    Payday loans can be fast online or direct the electronic equipment if have
    a bank informing and a accounting entry card.
    The absolute loan work is so hard that most of the citizenry try collateral, draft this loan out for executable loan activity.


Comments . . .