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Old 09-02-2008, 04:34 PM
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New here with a sbc question

Hi guys, i recently had to put a new cam in my small block 406, its a hydrali flat tappet. Anyway my question is, The car wont start now, and it makes a kind of internal pop like throgh the exhaust, but the car will not fire, the cam in lined up wit hteh cam gear dot meeting the crank gear, w no1 tdc. ive got the rockers set nice and loose cause i thought maybe i was hanging and exhuast valve open. Also when i advance the distributor (like way advance when from where it was normally) it doesnt seem to pop as soon or as long. thanks for your help in advance.

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Old 09-02-2008, 04:42 PM
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You sure you're not 180 deg. out on the dist? easy to do...I,ve done it more than once.
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Old 09-02-2008, 04:53 PM
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dot to dot on the timing set is TDC #6
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Old 09-02-2008, 05:25 PM
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thats how they showed the cam being installed in everything i looked at on the net? so are u telling me i need to take the motor apart again and switch the cam around/?
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Old 09-02-2008, 05:26 PM
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turn the distributor 180 degrees
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Old 09-02-2008, 05:31 PM
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ok. last time i did that it was popping real bad out of the carb, like shot a fire ball out, i was told that this was cause it was 180 out then/?
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Old 09-02-2008, 05:40 PM
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Just like most of us have done in our time in the garage...you need to step back, take a few long breaths, get some help that REALLY knows and start at the beginning. No need to take the engine apart, just make sure the cam is installed right, run the valves, install the dist. make REAL sure the wires go to the correct spark plugs.

Double check everything and then try to fire it off. It will work if you've done your homework and built it correctly. Believe me, there nothing wrong with asking for help, even if you have to pay for it.
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Old 09-02-2008, 05:41 PM
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ya im sure ive got everything adjusted right, and the cam in correctly. generally if i read something i can figure it out. im not totally mechanically inclined hahah.
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Old 09-02-2008, 06:02 PM
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The stupid thing about chevies is the timing marks on the gears vs. the dist position.

When the gears are "dot to dot", the engine is actually at TDC on #6 cylinder. (don't ask me why, it is what it is!)

Easiest way is to pull #1 plug, put your finger over the hole and have someone bump the starter until your finger blows out. Then manually rotate the engine while watching the marks on the timing cover and balancer. When you reach zero ( or 4 or 5 or 10, close enough), THEN pull the dist cap and see where the rotor is pointing. If needed, pull the dist up a tad and rotate the rotor into position so it is pointing to the #1 wire tower on the cap.
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