When installing timing chain and cam in 350 chevy - Team Camaro Tech
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post #1 of 16 (permalink) Old May 28th, 11, 09:23 AM Thread Starter
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When installing timing chain and cam in 350 chevy

When installing a cam and then aligning the timing chain marks in a 350 chevy does the #1 piston need to be at TDC when this is being done?
Or does that only matter when you are stabbing the distributor in.
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post #2 of 16 (permalink) Old May 28th, 11, 09:27 AM
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Re: When installing timing chain and cam in 350 chevy

Yes. #1 TDC

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post #3 of 16 (permalink) Old May 28th, 11, 09:31 AM
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Re: When installing timing chain and cam in 350 chevy

Yes. #1 and #6 will be at TDC. When you align the gears "dot to dot" as in the picture, be aware that #6 will be at TDC on the compression stroke and #1 will be at TDC on the exhaust stroke. Install distributor accordingly.

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post #4 of 16 (permalink) Old May 28th, 11, 10:40 AM Thread Starter
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Re: When installing timing chain and cam in 350 chevy

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Yes. #1 and #6 will be at TDC. When you align the gears "dot to dot" as in the picture, be aware that #6 will be at TDC on the compression stroke and #1 will be at TDC on the exhaust stroke. Install distributor accordingly.

So the distributor rotor would actually be pointed at #8 piston then if the timing chain is installed as shown or 180 degrees out?
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post #5 of 16 (permalink) Old May 28th, 11, 11:15 AM
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Re: When installing timing chain and cam in 350 chevy

No, rotor should face the #1 piston.

1969 X66 396 LeMans Blue, M20, 373 ...
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post #6 of 16 (permalink) Old May 28th, 11, 12:19 PM
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Re: When installing timing chain and cam in 350 chevy

All you need to worry about is getting the two dots to align.
There's a dowel pin on the cam and the crank has a keyway.
If the dots are lined up you can't screw it up.

Then get your #1 piston on TDC compression stroke(your timing mark on the crank should be close to zero). Drop the distributor in and the rotor should be pointing slightly before the #1 position (it rotates clockwise).
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post #7 of 16 (permalink) Old May 28th, 11, 12:28 PM
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Smile Re: When installing timing chain and cam in 350 chevy

sprocket marks dot to dot as shown will be # 6 firing !

both marks at 12 o'clock will be #1 firing !

You want to drop in the distributor to match the above.


69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 TPI transmission, 12-bolt w/Eaton 4.11:1
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post #8 of 16 (permalink) Old May 28th, 11, 01:20 PM
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I always use about 10 degrees before TDC ( advanced) by the timing mark because you are going to have to advance the disti from zero to get it to run well anyway.

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327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.
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post #9 of 16 (permalink) Old May 28th, 11, 02:16 PM
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Re: When installing timing chain and cam in 350 chevy

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No, rotor should face the #1 piston.

If you line the gears up dot to dot, set the dist to #6, the service manual explaines in detail???
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post #10 of 16 (permalink) Old May 28th, 11, 02:35 PM
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Re: When installing timing chain and cam in 350 chevy

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If you line the gears up dot to dot, set the dist to #6, the service manual explaines in detail???
Yes, I was thinking 12 o'clock position. (explains)

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post #11 of 16 (permalink) Old Apr 21st, 15, 02:39 PM
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Which mark would it be on this crank gear? I'm guessing the triangl . #1 seems to be at tdc
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post #12 of 16 (permalink) Old Apr 21st, 15, 04:01 PM
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Re: When installing timing chain and cam in 350 chevy

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Which mark would it be on this crank gear? I'm guessing the triangl . #1 seems to be at tdc
If you resize (blow up) the photo and look closely at the 2nd tooth past the keyway, there is a definite circle pattern with what appears to be a triangular shaped punch mark in the center. That's the one to use.

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post #13 of 16 (permalink) Old Apr 21st, 15, 04:23 PM
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Smile Re: When installing timing chain and cam in 350 chevy

Yes, I would use the triangle mark. The crankshaft keyway should be at approximately 2 o'clock.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 TPI transmission, 12-bolt w/Eaton 4.11:1
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post #14 of 16 (permalink) Old Apr 24th, 15, 12:29 PM
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Re: When installing timing chain and cam in 350 chevy

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No, rotor should face the #1 piston.
Nope. They never corrected THAT misprint/typo in the Service Manual either, which has caused more "won't start" first-fires than anything else. The tip of the rotor shouldn't point at ANY piston or cylinder. With the #1 cylinder at TDC on the compression stroke (both valves closed), install the distributor so the tip of the rotor points to the #1 wire tower in the cap. Yes, it's that easy.


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post #15 of 16 (permalink) Old Apr 24th, 15, 05:20 PM
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Re: When installing timing chain and cam in 350 chevy

Before you drop the dist in, face the pump slot towards the front and rear of the engine. Face the dist rotor to the front of the car and drop it in and it should be at the #1 post of the dist cap and you already know what direction the vacuum advance should face.

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