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Old May 3rd, 2010, 12:11 AM   #1
Bc1980
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Default ok time to ask the experts...chevy 350

scenario is a friend of mine builds chevy 350 using i have no idea, puts it in his malibu.
tows it to my shop for me to swap the carb time and dial in the carb.no problem............................


here is where it gets interesting and I need to know how it got interesting.


timing mark on stock balancer is 180 off... and before anyone says your on the wrong plug wire or the cap is wired wrong its correct.so how is this possible seriously

can i just use #6 to set the timing?I didnt try yet but it makes sense in my head.

Last edited by Bc1980; May 3rd, 2010 at 12:17 AM.
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Old May 3rd, 2010, 12:21 AM   #2
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he installed the timing gear 180deg off.. that will put the entire vavle train 180 out as well.... what your getting is compression stroke on #6 when you need exhaust stroke on #6 and exhaust stroke on #1 when you need compression... the only way to do that is to install the upper timing gear 180 deg off.. so in that case you probably can time it from #6..
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Old May 3rd, 2010, 12:25 AM   #3
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instead of putting the cam gear at 6 o clock to line up the dots with the carnk gear at 12 o clock.. he must have installed them with both dots at 12 oclock..
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Old May 3rd, 2010, 12:32 AM   #4
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he installed the timing gear 180deg off.. that will put the entire vavle train 180 out as well.... what your getting is compression stroke on #6 when you need exhaust stroke on #6 and exhaust stroke on #1 when you need compression... the only way to do that is to install the upper timing gear 180 deg off.. so in that case you probably can time it from #6..
we will find out tomorrow. I never pulled the cap to see where the rotor was at because it runs. but that makes sense now that if they ran it 180 off on the cam and then dropped the distributor to compensate.guess that makes them smart enough to be dangerous if thats what happened.

but if anyone else has any theorys feel free to post.

could the balancer have slipped 180?
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Old May 3rd, 2010, 06:08 AM   #5
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There's only one way the balancer can go on.
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Old May 3rd, 2010, 06:18 AM   #6
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Pull #1 plug. Bump motor until you start to get compression on #1 cylinder. Insert skinny screwdriver or long 1/4 drive extension into spark plug hole so you can feel piston. Rotate engine by hand until your probe (screwdriver, etc.) stops moving. You are now at #1 TDC. Check mark on balancer. If mark does not line up, make your own. Check distrubutor. Reset if necessary. At this point everthing should run and line up normal.
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Old May 3rd, 2010, 06:21 AM   #7
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Quote:
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he installed the timing gear 180deg off.. that will put the entire vavle train 180 out as well.... what your getting is compression stroke on #6 when you need exhaust stroke on #6 and exhaust stroke on #1 when you need compression... the only way to do that is to install the upper timing gear 180 deg off.. so in that case you probably can time it from #6..
If your timing gear is 180 off, that just puts the #1 cylinder on its exhaust stroke. 1 more rotation of the crank and the timing marks would align. If the distrubutor was installed 180 deg off, it would not run.
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Old May 3rd, 2010, 08:10 AM   #8
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If your timing gear is 180 off, that just puts the #1 cylinder on its exhaust stroke. 1 more rotation of the crank and the timing marks would align. If the distrubutor was installed 180 deg off, it would not run.
yes but #1 would become #6 in the firing order.making the mark 180 out with the gun. get what im saying nuggets. Ill know today. I was tired and letting it get the best off me. today is a new day.
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Old May 3rd, 2010, 05:58 PM   #9
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around 160 degrees out on the cam.wooo hooooooo just enough to have to tear it apart to get it to run right.Morons good thing they have deep pockets.

Last edited by Bc1980; May 4th, 2010 at 08:33 AM.
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Old May 4th, 2010, 06:46 PM   #10
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aside from all the regular BS in here .. yes balancers can spin on the rubber & hub and can be way off.
secondly if he used a P truck balencer it can be approx 160* off. they time from the bottom left of the engine.
also if he used the correct chain & gears but put both marks straight up then he is a 90* out of time on the cam.

best way to figure out what you have is to rip the valve cover off the Top of the #1. watch the valves and watch the opening on the valves. if it runs a normal cycle then you are OK, but if the piston comes up on top of the stroke before the valves all shut after two turns then you'll be forced to rip the front cover and hope he didn't bend any valves.
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