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Gino Fultano 08-23-2003 12:35 PM

engine hard to turn over by
ok heres the run down, used 350, from a suburban, put an edelbrock 2102 cam in it, i am trying to adjust the valve lash while the engine is on the stand, but it is very hard to turn over by hand, how hard should it be to turn by hand? i have a 15" long peice of pipe bolted to the damper that i am turning it with. is there any way i can have the valve lash so tight the valves are hitting the pistons? could i not have tdc right? please help me out here. thanks.

troy-curt 08-23-2003 12:46 PM

Need a little more information, did you put rings and bearings in it?
do you have the plugs out?

If the valves are hitting the pistons, you should be able to feel it.

Good Luck

Gino Fultano 08-23-2003 12:50 PM

more info, the only thing i changed was the cam, still have the stock block, piston rings, bearings, everything. yes the spark plugs are out, all of them. if the valves are hitting the piston, would i be able to turn the engine over completely or would the valve stop me from tuning anymore? thanks for your help.

troy-curt 08-23-2003 12:54 PM

You could feel them touch, if its hard enough you could not go any futher.

Put some oil in the cylinders and rotate it. It should be easy to turn.


western star 08-23-2003 07:49 PM

Just a couple of things first. The engine stand is bolted to your block right and it's not a home mader that might be hitting the back of the crankshaft? Was the engine hard to turn over before you set the valves. What are the specs on you cam? ie lift and duration. Start from scratch with the lifters backed right off and plugs out. That puppy should turn over with a 1/2" ratchet no problem. If it does then start to set them. How are you setting them?

1quiknova 04-22-2005 08:04 AM

With the spak plugs out it should take I beleive no more than 30ft/lbs to turn the engine over, if i remeber correctly. The first thing to do is completely back off all of the rockers and see if it cranks over easily, if not than something's not right inside that motor. If this is the case, tear it apart now whiel it is still on the stand.

1quiknova 04-22-2005 08:08 AM

one more thing, if you do go ahead and rebuild the motor before you do anything install jsut the bearings and crank and torque all the caps, then you should be able to spin the crank by hand pretty easily, if not your clearences are too tight or the crank is warped.

VetteMech 03-15-2008 09:28 AM

no roller heheh
Back the springs off and see if it rolls first.
Why would you tighten all of them down at the same time????

I would have had it already set on number 1 tdc and previously turned the crank a few times after I set put the timing chain back on. And starting at number one ...I would cold lash those 2 valves full turn of the crank and do the next and then the next 2 on
With each valve setting the engine gets incremetaly harder to turn....

If suddenly it no longer tuns over by hand .... you know you got a problem and what the problem is. Simple mechanical methodology.... the order of your assembly is mixed up.... I mean ...missing a "Turn the engine at least one rotation after each step."...

Did you change the lifters too? or pushrods? Is it a racing cam??
You trying to build it up so it blows up better?

You didnt give us much to go on.

Let us know what happened


MI2600 03-15-2008 11:27 AM

This thread is five years old! Hopefully he figured out his problem.

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