Question about 1985 Chevrolet Chevy

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1996 chevy truck. (HotRod). I have a 421 sbc with 13.5 compression. New motor never cranked. First i intalled motor then proceed to get piston to top dead center, so pulled #1 plug all others was still in and got it. I primed oil pump with drill and stabbed distributor. Then tried to crank it and acted like the battery was dead. New battery, starter and all. I can't seem to figure out this problem. Before i primed oil pump the motor turned over fine. I tested all wiring and test good, battery good, and starter good. Please help!!!!!!!!!!!!!

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Hi, sounds like you did all the pre-start things right. All of your bearings should be nice and lubed so you won't spin one. I don't know how much oil pressure you have built up on the gauge, but I have heard of to much causing the motor not to turn like it should. Yes, you can leave all of the plugs in when you bring # 1 up to top dead center, and point you rotor to #1 on the cap. Make sure its on the compression stroke and not the discharge stroke. Here is what happened to me when I built up my 69 Z-28, It turned over great just like yours. After priming all of the bearings, crank and so on through the distributor, mine started for about 3 seconds and stopped, wouldn't turn over anymore. Found that it spun a rod bearing on # 8 journal and had to pull the motor, pan and find it. Hung a new piston, rod, and bearings and it ran fine for many years.Crank had been turned, but no damage. Try pulling all of your plugs to see if it turns over then. I don't believe you have spun a bearing on this new motor. Did you buy this motor complete from a shop?? I would pull the plugs, the distributor, to see if you can relieve some of the oil pressure. This may be your only problem. If it spun a rod or main bearing when you first tried to turn it over, it wasn't put together properly from the start! Just because its new, does not mean its correct, keep this in mind. From what you are saying, it sounds like a mechanical and not electrical problem. Keep me posted by my user name below, so we can get it running for you. Hang in there and don't get frustrated, we can get to the bottom of this. I will wait to hear back from you.

Posted on Aug 02, 2010

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What kind of starter are you using to turn a 13.5:1 motor? What kind of battery (CCA)? I'd say you need a hi-torque starter in this application and a HD battery (800CCA or more). Ground cable? Excessively long cables? If you moved the battery to the bed, you need really heavy cables and possibly two batteries on one heavy one. Check for available voltage at the starter while someone cranks. Needs 10.5 volts minimum to work. If it's not there, you need to find out why.

Also - is your timing off? I have seen balancer marks move because of the rubber mounting. Pull valve cover and check to see if timing mark coincides with #1 cylinder intake valve closing. Bad timing (advanced too far) will drag a starter way down.

Posted on Aug 02, 2010


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