Gosh-dern valves....

[Slammed70]

Will too tight of valves will that cause an engine not to run? Lets just say hypathetically....and I mean hypathetically I was inebriated and in a hurry and maybe....and I mean maybe done something like 1-1/2 turns after zero lash.

[fine69]

Sure it can. If you tighten them too far none of the valves will be closed. Hence no compression.

And it wont run. 1 1/2 turns shouldnt do it. Loosen them up and see what happens.

[Slammed70]

Alright bgiood,I dont know why else thing s thins wont start

[72swb_327stroker_?]

just a little inebriated??????? saturday? nice weather? i want to get inebriated today

[tbags]

Check your timing - has fooled plenty of people on a fresh build

[milled]

Originally Posted by tbags

Check your timing - has fooled plenty of people on a fresh build

+2 on timing sounds advanced to much
On the valves I adjust them with the engin running at temp back them o\ff till they start ticking then SLOWLY tighten till the noise stops then take them 1/2 turn tighter some guys like 3/4 turn. This is all based on a hydrolic cam and lifters.

adjust one valve at a time.

[Longhorn Man]

what exactly is it doing?

[454_72_4X4]

[QUOTE=milled;2640747
On the valves I adjust them with the engin running at temp back them o\ff till they start ticking then SLOWLY tighten till the noise stops then take them 1/2 turn tighter some guys like 3/4 turn. This is all based on a hydrolic cam and lifters.

adjust one valve at a time.[/QUOTE]

That's exactly how I do it!

I think factory specs is 3/4 to 1 turn, but I like 1/2 turn.

[Boog]

It would help to know what has been done to it. Complete rebuild, cam swap, head swap? If not has the dist been moved? Is the power wire to the coil connected? You suspect the valves being too tight and if you did not follow the adjusting procedure then I would agree with you. Did you roll the motor over to ensure both the valves were fully closed before adjusting on each cylinder?

[Walts_restoration]

I always do a little over 7/8s of a turn, and my dad used to be a chevrolet mechanic when these things were new so i learned from him. Could be alot of stuff.

[cdowns]

do you know if the distributor was put in at TDC on the COMPRESSION STROKE?

[Slammed70]

Its just not starting, and its aggitating the hell out of me. Cranks fine, will crank and crank until the battery goes dead if I stayed on the key that long. Its cranks fast too, like its not even trying to hit and fire. It has gas, I can see it dumping from the oversized carb, and I know it has spark because the spark tester.....and my hand don't lie. I'm sure its at the right time because its not backfiring or anything. I installed the distributer OUT of the truck, dropped it with number one at TDC, timing mark on zero, and the rotor pointing at number one. Installed the wires 1-8-4-3-6-5-7-2.

The motor is mostly new, motor had ~15K on it when I pulled it. I orginally pulled it to redo the rear main. The bottem end was in such good shape that I could still see the cross hatches on the cylinders, so I didnt mess with it. Heads were also in good shape, so basically all I did was give it a good scrub, new cam/lifters, timing set, and gaskets. It ran perfectly when I pulled it, just leaked gallons at a time. Also went through the original TH350 while it was out. Painted it black too so I cant see any new leaks....

[67_C-30]

As fine69 said, if you think you really turned the rocker arm nuts 1 1/2 turns, readjust them. If they are all that tight, it is not going to crank. The valves aren't closing if you went 1 1/2 turns. Loosen them back up to zero lash, and turn the a 1/4 - 1/2 turn. There's no reason to go any more than that.

[Arad68]

Re-adjust the valves, just not quite so tight. Loosen all of them, then only tighten them 1/4 to 1/2 a turn after zero lash. When you loosen the valves the compression should come back.

[cdowns]

Was The Tdc That You Stuck The Dustributor In The Compression Stroke???

Do You Know What The Compression Stroke Is???

have seen many guys waste many hours by sticking the dizzy on the exhaust stroke and keep goin round and round that they put it in on topdead center//it doesnt fire on topdead center of the exhaust stroke only the compression stroke will allow it to fire

[haysonj]

Check to see if your compression is good Timing should be a few degrees before TDC It won't fire if you are past TDC. I had one that would not fire due to new rings not seated Put a squirt of oil in each cylinder and it fired right up. As far as valves the additional turn is to center the push rod in the lifter a little loose is better than too tight

[Sport/Truck]

Originally Posted by 67_C-30

As fine69 said, if you think you really turned the rocker arm nuts 1 1/2 turns, readjust them. If they are all that tight, it is not going to crank. The valves aren't closing if you went 1 1/2 turns. Loosen them back up to zero lash, and turn the a 1/4 - 1/2 turn. There's no reason to go any more than that.

If the valves are too tight to cause them to not close, would an indication be for it to back fire up through the carb & exhaust simultaneously?

s/t

[ChaseDale3and8]

You mentioned that you changed the cam. Did you make sure that the timing marks were together? One mistake that I made many years ago while I was still learning about these engines was I did a cam swap once.

When I lined up the timing marks on the cam and crank, I didn't rotate the engine over. Dropped the distributor in on #1, put everything back together. Damn thing wouldn't start no matter what I did.

What it turned out to be is that when the timing marks are lined up close together they are set to fire the #6 cylinder, which made it 180 degrees out of time. I found this out after a neighbor came over to help me out.

I bumped the motor over with him holding his finger in the #1 spark plug hole until he felt compression. We rotated the crank to TDC then installed the distributor at #1 and she fired right up. Sometimes it's the simple things that you overlook that cause the most problems. ...Joe

[Slammed70]

Yeah, Im pretty sure it was at TDC compression stroke, its not backfiring or anything when I cant it....but I dont have compression so I guess it wouldnt be trying to backfire. And yes, I know what the compression stroke is.

And the timing marks were right, I put a gear drive in it...and fought getting the damn teeth lined up for about 5 minutes. So I checked it about every 10 seconds to make sure I didnt move it.

[67_C-30]

Originally Posted by Sport/Truck

If the valves are too tight to cause them to not close, would an indication be for it to back fire up through the carb & exhaust simultaneously?

s/t

Not necessarily, because you would have to be building some kind of compression for it to pop back.

[b&a72]

Did you leave the the cam and crank gear at 6 and 12? Were the dots aligned? If so they should be at 12 and 12 to be at TDC compression stroke #1 cylinder. I also made that mistake a few years back. I know alot of people have mentioned this but mine had the same symptoms when I did mine wrong.

[Slammed70]

Originally Posted by b&a72

Did you leave the the cam and crank gear at 6 and 12? Were the dots aligned? If so they should be at 12 and 12 to be at TDC compression stroke #1 cylinder. I also made that mistake a few years back. I know alot of people have mentioned this but mine had the same symptoms when I did mine wrong.

Originally Posted by Slammed70

And the timing marks were right, I put a gear drive in it...and fought getting the damn teeth lined up for about 5 minutes. So I checked it about every 10 seconds to make sure I didnt move it.

6 and 12