BBC 396 no start - Chevelle Tech
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post #1 of 31 (permalink) Old Aug 31st, 19, 11:47 PM Thread Starter
 
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BBC 396 no start

So I recently did a minor top end and cam replacement on my 396. 396 team G intake, Edelbrock 1413 carb, aluminum heads 115cc combustion chamber/300 intake runners/2.25 stainless steel intake valves and 1.88 exhaust valves/135lbs closed pressure, comp cams Magnum 280H Hydraulic Flat Tappet Camshaft
Lift: .520''/.520"
Duration: 280/280.

So my question is what is a good valve lash to set cold? For the life of me she just won't fire up and I am drawing a blank. Cam and crank were times with dots facing each other, I have dropped the distributor 180 back and forth trying to get it to fire! I have spark and fuel. Currently valves are lashed .022 int and .024 ext.

Thanks in advance y'all!
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post #2 of 31 (permalink) Old Sep 1st, 19, 12:10 AM
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Re: BBC 396 no start

What cylinder heads?
What lash is stated on the cam card?

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post #3 of 31 (permalink) Old Sep 1st, 19, 12:30 AM Thread Starter
 
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They are steel pro pistons .060 over. Cam was given to me by my father.
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post #4 of 31 (permalink) Old Sep 1st, 19, 1:01 AM
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Re: BBC 396 no start

Set the lash at 1/2 turn down from 0 lash. Make sure the lifters are full of oil before setting lash.

Put a timing light on the engine and see where the timing is as you crank it over. Probably way out.
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post #5 of 31 (permalink) Old Sep 1st, 19, 1:06 AM Thread Starter
 
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And when you say zero lash. You mean till the up and down play in the push rod is gone? Or?
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post #6 of 31 (permalink) Old Sep 1st, 19, 1:29 AM
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Re: BBC 396 no start

Yes. No movement of the pushrod when cam has lifter on it's lowest point.
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post #7 of 31 (permalink) Old Sep 1st, 19, 1:37 AM Thread Starter
 
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So my next question would be: if I set it that way aren't the chances of a valve staying open higher?

Do you adjust lash be the EO/IC method or the TDC #1 set correspondencing valves then TDC #6
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post #8 of 31 (permalink) Old Sep 1st, 19, 3:01 AM
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Re: BBC 396 no start

Quote:
Originally Posted by Spilmania View Post
So my next question would be: if I set it that way aren't the chances of a valve staying open higher?

Do you adjust lash be the EO/IC method or the TDC #1 set correspondencing valves then TDC #6
NO.

EO/IC method. Exhaust opening, adjust intake. Intake closed adjust exhaust. Follow the firing order. It may take a few more turns, but you won't mess up that way.

While you are there at the #1 hole, turn the engine until the intake valve is closed, then watch your timing mark and line it up to zero. Check to make sure your dist rotor points to the #1 wire term on the cap. Now you know your dist is installed correctly.

You have a hydraulic cam, you don't run lash on it, you run preload. Find zero lash (the point where the pushrod wont move up or down. Not the point where the pushrod wont spin anymore)), then tighten 1/2 turn. Use EOIC method and you'll be good to go with any cam you install. Any other method can lead to failure depending on the grind.

Running lash is for mechanical camshafts.

Let us know when you get it running.
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Last edited by DUTCH MAX HEADWORK; Sep 1st, 19 at 3:29 AM.
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post #9 of 31 (permalink) Old Sep 1st, 19, 3:44 AM
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Re: BBC 396 no start

Here's EOIC. Disregard the lash clearance part with the feeler gauge. That's for a solid lifter camshaft. For your hydraulic lifters, you will set at zero lash, then tighten 1/2 turn.

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post #10 of 31 (permalink) Old Sep 1st, 19, 1:23 PM Thread Starter
 
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I'm starting to wonder if the valve springs on the head are as strong as they claim. Re lashed using EOIC method and still no change. Will pop and that's about it.
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post #11 of 31 (permalink) Old Sep 1st, 19, 2:45 PM
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Re: BBC 396 no start

If it pops when trying to fire, that is usually a timing problem. Are you sure you don't have the distributor 180 degrees off? Recheck, or way to retarded.
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post #12 of 31 (permalink) Old Sep 1st, 19, 2:56 PM
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Re: BBC 396 no start

Did you verify your dist timing by watching the 1 intake valve closing and lining up the timing mark, then checking rotor position alignment to 1 position on cap?

Check your firing order and trace down to each plug.

I highly doubt that weak valve springs would cause an issue at idle unless the were so weak the valve hangs open,

Last edited by DUTCH MAX HEADWORK; Sep 1st, 19 at 3:21 PM.
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post #13 of 31 (permalink) Old Sep 1st, 19, 4:22 PM Thread Starter
 
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With the springs I just wonder if the seat pressure is enough for the cam.
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post #14 of 31 (permalink) Old Sep 1st, 19, 4:53 PM
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Re: BBC 396 no start

Quote:
Originally Posted by Spilmania View Post
With the springs I just wonder if the seat pressure is enough for the cam.
There is no way the springs are your problem.

Find top dead center for #1; it's the front cylinder on the drivers side.
As you rotate the engine, the #1 intake valve will go down and then up.
It's the first valve in the front of the engine. Right after it closes, you are almost at TDC.

Your distributor rotor should be close to pointing at #1 spark plug terminal.

It looks like the distributor is your problem. Get it installed correctly.

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post #15 of 31 (permalink) Old Sep 1st, 19, 5:24 PM
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Re: BBC 396 no start

Quote:
Originally Posted by Spilmania View Post
So I recently did a minor top end and cam replacement on my 396. 396 team G intake, Edelbrock 1413 carb, aluminum heads 115cc combustion chamber/300 intake runners/2.25 stainless steel intake valves and 1.88 exhaust valves/135lbs closed pressure, comp cams Magnum 280H Hydraulic Flat Tappet Camshaft
Lift: .520''/.520"
Duration: 280/280.

So my question is what is a good valve lash to set cold? For the life of me she just won't fire up and I am drawing a blank. Cam and crank were times with dots facing each other, I have dropped the distributor 180 back and forth trying to get it to fire! I have spark and fuel. Currently valves are lashed .022 int and .024 ext.

Thanks in advance y'all!
If you have a hyd cam why are you trying to lash the valves like a solid lifter cam? do like the guys say get each rocker on the base circle then set it until the pushrod does not turn and add 1/4 turn and your done. A 282S is the one you would set the lash like the way you are doing it. The engine should fire right up, hope this is not a new cam as you may have wiped all the moly cam lube off the cam if there is excessive cranking.
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