Does this mean i need a valve job?

[thor'svr4]

I was cleaning up a set of heads with soapy water and noticed that the water would leak down the intake ports past the valve/valve seat. In this video i filled the intake runners with some water and filmed how quick the water from the intake runners dripped past the valves. Is it safe to say i need a valve job?


https://www.youtube.com/watch?v=VgfCDW1RouQ

[RealMcCoy]

Doesn't look too promising, but it could be carbon build up, and just need a good cleaning. Definitely calls for disassembly and inspection.

[KeithMac]

An hour with some grinding paste and a valve sucker and you could re-seat all the valves.

Take the valves out and check they're straight (I spin them in a drill, instantly visible if they're even slightly bent ;)).

[thor'svr4]

Well i took my motors original head and did the same 'water test' and not a single drop leaked past. So i bought some valve lapping compound and the suction cup tool and have been at it for a few hrs. Its slow going but it looks like all the valves will seat properly.

Im curious to see if this helps with my compression. I had decent compression (150ish psi) across all cylinders even with all 24 valves leaking but im running 8.5:1 pistons and the OEM spec is 156psi with 8:1 pistons...

we'll see what happens.

[murphys_law]

For future reference you can get a piece of vacuum hose and put it over the valve stem and turn it with an electric drill(I use battery as the rpms stay low ish).

Have used this technique on the last two valve jobs I've done and I'll never go back.

http://images.tapatalk-cdn.com/15/05/18/6261574c2cf43d36816e38bbe9b67a0a.jpg

http://images.tapatalk-cdn.com/15/05/18/5d14aa49f8eb7358f5ec66722f953760.jpg

[green-lantern]

Saw that video the other day. Seemed like a good way to do it to me. Just make sure (like the video said) to lube the stems well.

[thor'svr4]

Thats a great idea. That little suction cup on a stick is a royal PITA. Ill have to give that method a try next time. Thanks for the advice

[RealMcCoy]

I've always used a chunk of hose to lap valves... Never used a drill though. I was taught to use an oscillating motion to properly lap them in, so I spin the hose between my palms. (think boy scout starting a campfire with a stick)