The engine should start right up! After Start-Up The Initial Timing is now set for 10 degrees BTDC. Install the distributor and tighten it down.The contact points should be barely misaligned.JUST SLIGHTLY rotate the distributor backwards from the normal direction of rotation.Line up the magnetic pickup with the reluctor.Align the distributor rotor with the cap location for the #1 spark plug wire.Turn the crank backwards until the degree wheel reads 10 degrees BTDC.Install the Degree Wheel on the crankshaft and set it to zero.Rotate the engine to TDC on the Compression Stroke of the #1 cylinder.Set the Lifter Preload or Valve Lash on all cylinders.If it's not already done, complete these steps before installing the distributor: If you recieved specific instructions from your engine bulider, please follow them. Good luck.The following is a general procedure that works well for most engines. If you want the most power/efficiency from your engine then learning how to set timing right is important. ![]() Copo put some good articles on here to look at. With no vacuum advance depending on how radical your cam is you will set your initial timing in the neighborhood of 8-20 degrees depending on how radical of a cam your running. Start the engine and adjust your distributor and watch the changes with your timing light. To set the initial timing you disconnect the vacuum advance from your distributor. Using a piston stop is a good way to verify where top dead center actually is. The timing tab can be in two different locations as illustrated from the picture below. Chevy made harmonic balancers with the top dead center mark in different locations on the balancer to match the timing tab. The reason everyone is saying this is because something does not sound right 50 degrees is very far from normal at idle. You need to verify top dead center is correct like the others have mentioned. I've been told to time it with line hooked up for full vacuum, starting at 0, at 2000 RPM.įirst things first. 12/12 I believe is correct, not 12/6 (crank 12/cam 6).Īll of this has been done with the vacuum canister unhooked. My other option is to take the timing cover off just to make sure the sprockets are lined up correctly. 1200 rpm is the start of the cam power band. This engine does not like anything other then 50 advance, at 1200 rpm. I've done this starting at 32, the don't it at 35, then at 40, and 45. What Ive been doing is using the balancer line to line up with 0 on the tab, by rotatining the distributorvas necessary. On the 307 balancer I have, there is a slit for lining it up with the tab. I'm using a digital timing light, which is how I know it's 50 advance. I didn't get a long neck water pump either. ![]() I have an after market balancer that goues up to 6500 RPm, but I didn't get underdrive pullies, so I can't use it on a 307. I am using a stock 307 balancer, (bought new). ![]() ![]() Where can I also find a timing spec for the cam I have? Because I am also thinking this engine needs to be timed based on the cam. Smaller cubes means less displacement and vacuum, so a small cam for your 350 means a big cam for smaller cubes. According to my buddy, none of this should have to be done, except it's not a 350. Or retarding the vacuum screw, connecting the vacuum line and doing it that way. What I could try is opening up the vacuum canistercanist, and timing with the vacuum line connected that way it's at full vacuum. I am starting to believe this engine can't be timed like a standard, (stock) SBC considering that mechanically, it's timed with TDC spec for small blocks. Single PCV breather on passenger side, non PCV breather on driver side. HEI distributor with 8 mm wires from a 74 Vette 350 (bought new) Adv Duration: 262/268 Lift: 477/488ģ50 accessory pullies because I lost my 307 crank pully. 1.84 intake valves, 1.5 exhaust valves, no machine work.Ĭomp Cams CCA-SK12-675-4. My engine is a 307, original bottom end, 3.874 original bore, (crank pistons), 3 speed, and 3.08 limited slip 12 bolt rear end.Įdlebrock 600 CFM electric choke 4 barrelĮdlebrock Performer RPM Dual Plane intakeģ05 416 cast non Vortec heads. I don't have a Camaro, but a SBC, is a SBC, doesn't matter the Chevy (72 c10) It's a lot, but my engine doesn't like anything other than that. Here is the issue I am having: 50 advance timing. First time posting here, long time reader.
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