AutomagicLS1

iTrader: (18)

This is probably a stupid question and i'm sure I know the answer but I need to ask first. If a valve job is done properly and you pour water on the combustion chambers with a spark plug in NO water should leak by the intake and exhaust valves regardless if the water is there 1 second, 1 minute, 10 minutes, 3 hours, 24 hours or what not? Am I right or wrong? This is what i'm dealing with. I've got 1 intake runner on each head leaking and on one head I have 2 exhaust ports leaking one you can see on the left on the right it's kinda hard to see. Before I poured water I went to a dark room and shined a led light into each runner/exhaust port and those leaking I could see a faint bit of light around the valve in a couple tiny spots

BigRich954RR

iTrader: (1)

Are the springs on the valves

getsum27

you are correct...... there should be no water getting through

butler

The question is where are the seats and guides?

hammertime

iTrader: (1)

Were the valves lapped after the machine work was done? You could hand lap the ones that are leaking to see if they seat afterwards.

It's not unusual for the valves/seats to leak a slight amount when checked cold, which is why compression and leakdown tests are more accurate when run hot.
Seems like there could be something wrong here. You could remove the spring on the problem cylinders and visually inspect the valves/seats. By slowly turning the valve while shining your LED light, you might figure out if anything is out of round, or if you perhaps have a valve that is not concentric to the seat, etc.

bww3588

iTrader: (49)

first of all, think about this. its not unusual for valves to leak a little bit of water when cold. once it heats up, it will seal. now...heres the thought....

how long are your vaves actually on the seat? not very long. not long enough for the cylinder pressure to overcome the valve to seat seal to cause any problems. i filled my runners up with water on my GEN I heads and they leaked within the first 10 seconds. just enough to wet the surface of the chamber, but nothing major. they run fine on the engine with a great cranking compression test and a great leak down test results. if they were my heads, i wouldnt worry about them.

SOMbitch

iTrader: (8)

Use some vasoline to to seal the valves then you can cc them....

KCFormula

iTrader: (4)

I'd want them lapped until they are right. IMHO

butler

The valve guides were shot due to wrong rocker arm being used(geometry) and seats were messed up.

novaflash2002

iTrader: (51)

if they are fully assembles, tap the valve with a rubber malled acouple of times. somtimes it just needs to get a couple pieces of dust out. also deisle fuel is recommened more than water.

butler

maybe the valve springs aren't tight enough? Check the head bolts.

01ssreda4

iTrader: (96)

^^^what head bolts are you refering to. They arent bolted to the motor at this point.....

bww3588

iTrader: (49)

the head bolts or rocker arm bolts for that matter, dont have anything to do with the spring pressure, or sealing of the valves.

69LT1Bird

iTrader: (1)

Take them back to whoever did the valve job and make them finish the job. Either they didn't lap the valves or they nicked the valve or seat and created a leak.
Either way, they should not leak or show light around them, period.

butler

At 53 I know my engines. I already stated what was wrong with the heads but you guys are so much smarter than me but you ignored it. The valve guides and seats were shot because of the wrong rocker arms. I know the guy and his car, we converse each week.

01ssreda4

iTrader: (96)

well butler....

69LT1Bird

iTrader: (1)

All I saw was sarcastic comments, nothing useful.

chpmnsws6

iTrader: (70)

If you want to fluff up like a rooster, BWW3588 has his associates degree in High performance technologies from the University of Northwestern Ohio.

You were wrong, and he was letting you know, and probably was not aware of your sarcasm. Millions of morons roam these forums giving false information, and he might of thought you were one of them. No harm, no foul.

bww3588

iTrader: (49)

obviously you dont know your motors, or you wouldnt have said this....unless you know something i dont about head bolt to valve spring relationships...

maybe after another 53 years, you wont make comments like this that make you look 12....

well....?

01ssreda4

iTrader: (96)

What the hell do head bolts have to do with a freakin valve job????....what kind of voodoo engine building are yall practicing out there on the intrawebzzz????