Exhaust value no sealing 4.3 Vortex <HELP>

[Mr S10]

1992 S-10 blazer 4.3 vortac vin w with non adjustable heads
I just had my heads redone and #3 exhaust valve is not sealing if i losen the rocker arm nut it seals.. Did i get a bad head job??? or is there anything i can do?
The blazer missing alittle it didnt pass smog at idle with HC 140 max im at 120 at 2500rpm the HC is at 31 max is 180, im in california, So my problem is at idle what can cause this problem?

Thanks Brad

[MT-2500]

Originally Posted by Mr S10

1992 S-10 blazer 4.3 vortac vin w with non adjustable heads
I just had my heads redone and #3 exhaust valve is not sealing if i losen the rocker arm nut it seals.. Did i get a bad head job??? or is there anything i can do?
The blazer missing alittle it didnt pass smog at idle with HC 140 max im at 120 at 2500rpm the HC is at 31 max is 180, im in california, So my problem is at idle what can cause this problem?

Thanks Brad

Do not drive it like that or you will burn up valve.

How many turns lose does it take to get a seal?

Sounds like the machine shop did not set valve stem heigh right.

If it has the non adjustable rocker and and you have to losen it up to get the valve to seal?
Then remove all rocker arms and lay a straight edge across top of valve stems.
They all should be even heigh.
Are they?

If not and one is way higher than the rest I would file or grind it down even with the rest.

If all valve stem heights are uneven you have a messed up valve job.
Then You may want to have a talk with machine shop and see if they will fix it on there dime.

Let us know how it goes.

[Mr S10]

Thanks MT-2500

I'll go see if all the valves are the same height now...

Will I did drive the blazer on a 3 hour round trip to the sierra mountains camping. That is with all the rocker arms torque to 20ft-lbs.

[Mr S10]

Will i did the test. and it looks like the #3 exhaust valve is low. I slid a feeler gauge between the valve and the straight edge.

[Scrapper]

Originally Posted by Mr S10

Will i did the test. and it looks like the #3 exhaust valve is low. I slid a feeler gauge between the valve and the straight edge.

i would go to the shop you had it done and rip them a new you know what and let them make it right on there dime.

[inafogg]

Will i did the test. and it looks like the #3 exhaust valve is low.

i would of thought it be higher??
it may not matter now but when reading #1 post
my 1st thought was a lifter problem

[MT-2500]

Originally Posted by Mr S10

Will i did the test. and it looks like the #3 exhaust valve is low. I slid a feeler gauge between the valve and the straight edge.

Strange it should have been high if you have to loosen rocker arm to get it to seal.
But they should be all the same hight if valve job done right.
As in upper post better check for lifter problem to.
And AS SCRAPPER SAID BETTER HAVE A TALK WITH MACHINE SHOP.
GOOD LUCK

[Mr S10]

I did replace a one lifter because it was stuck.. I cant remember what one it was.. It could be that one...

The reason i had my heads done. becasue i bent a rod do to the fuel regulator going out pouring gas in to cylinder 4 fill it up when i tryed to stated it, it when clunk. after i fix that it had a weird ticking noise from the bottom end the ticking noise was the rod being bent hitting the pan..

This head i had a hard time getting the exhaust header to fit right. i have to drill out the exhaust header to get the bolts to line up.. It was huge about 1/4 inch on the front bolt and on the last bolt. Is that normal i even got one from the junk yard it didnt line up eather.

This weekend i'll go in there to see what my lifter looks like and check the size to the other ones.
Hope its not rain...

Thanks Guys for read my post and helping me thru is..
Not the best at spelling..

[MT-2500]

Originally Posted by Mr S10

I did replace a one lifter because it was stuck.. I cant remember what one it was.. It could be that one...

The reason i had my heads done. becasue i bent a rod do to the fuel regulator going out pouring gas in to cylinder 4 fill it up when i tryed to stated it, it when clunk. after i fix that it had a weird ticking noise from the bottom end the ticking noise was the rod being bent hitting the pan..

This head i had a hard time getting the exhaust header to fit right. i have to drill out the exhaust header to get the bolts to line up.. It was huge about 1/4 inch on the front bolt and on the last bolt. Is that normal i even got one from the junk yard it didnt line up eather.

This weekend i'll go in there to see what my lifter looks like and check the size to the other ones.
Hope its not rain...

Thanks Guys for read my post and helping me thru is..
Not the best at spelling..

Good idea there.
Check the lifting height and rocker arm and push rod lenghts.
If you still have rockers off check the height of top of push rods and push rod lenghts.
If valve stem heigh is even with the rest or a little low and you have to losen up rocker arm to get valve to seal.
There is someting raising to much on opening valve.
You mught also switch rocker arms .
Good luck and let us know how it goes

[Mr S10]

I'll check the push rod and swap the rocker arm. thats alot easyer then pulling the thing apart...

[MT-2500]

Originally Posted by Mr S10

I'll check the push rod and swap the rocker arm. thats alot easyer then pulling the thing apart...

10-4 on that.
How far do you have to losen it before valve seals?
If all else fails grind some off of top of valve stem

[Mr S10]

Originally Posted by MT-2500

10-4 on that.
How far do you have to losen it before valve seals?
If all else fails grind some off of top of valve stem

Its about 1/2 of a turn out

Ok so match two push rods and there the same

I switch the rocker arms. and now its hard to starts when i back off the rocker arm nut and it starts. its running abit rough but now i have smoke coming out the back (muffler), i do have the valve cover off.. can the smoke come form that (i did a oil change on a friends car and spiled some oil on the header and it smoked out the back, is this the samething)

And one more thing it takes about 10 minute for oil to come out of the puch rods at idel it just runs out, not flicking all over the place is this bad??

[Mr S10]

Ok so what dose this mean i changed back the rocker arms and torque it down to 20ft lbs its fires right up and no smoke??

[MT-2500]

Originally Posted by Mr S10

Ok so what dose this mean i changed back the rocker arms and torque it down to 20ft lbs its fires right up and no smoke??

Is it running without missing now with rocker arms torqued down?
If so you should be good to go.

[MT-2500]

I have had lifters where you had to leave rockers a little lose and tighten down real slow a little at atime while running to get lifter to readjust itself.