It has a crack between the spark plug hole and the intake valves. What are the chances of this being fixable?



Modified by TwoKSiR at 9:59 PM 7/27/2007


Modified by TwoKSiR at 12:34 AM 7/28/2007

 

Looks like a casting mark to me. Then again its 2am

 

my camera is old and only 3.1mega pixels. Its a crack. The machine shop found it when they were cleaning it.

 

To make sure we are clear, its between the spark plug hole and the top right valve correct ?

Looks pretty close to the threads, I would be worried about melting the threads and causing issues there.

 

Pic changed. Added arrows to the cracks, there are 2.

 

And I would have the plug have rethreaded. This isnt a crazy fast boosted car. It's a built head w/stock ports. Basically stockish GSR block. 11.1:1 compression.

 

Actually I forgot to add in the flat faced valves and milled head into that math so more like 11.8:1

 

I've seen heads with dropped valve carnage be fixed, so I'm positive that can be fixed...Expect them to have to retap the spark plug threads, also, they may have to reshape the valve seats I'm sure. Expect it to be pretty labor intensive regardless of how easy the fix seems to be...

 

stock ports? might as well just buy another bare head

 

It can be fixed , but it will involve removing the seats and grinding out the cracked area.Then welding and re-machining the valve seat pockets and spark plug hole.
The aluminum is pretty solid in that area.If it's not leaking i would just run it or replace it.Fixing it is really more work than it's worth for a stock head.

 

ok. What do you think it will cost?

 

ur not going to leak compression or coolant, so why not run it?

if it ends up being F'ed, then u could take the money that u were going to use to fix that one, on a different one.

 

2 out of 10 heads that come n the shop are cracked there its just into the plug hole .. its usally from being overheated or running with the plugs loose ..

I havnt seen one drop a seat when there cracked there

 

If you decide to buy a new head, I have a ported ITR head that came off a 260whp motor.

 

^^^Didn't know it was that common.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by herecomesboost &raquo;</TD></TR><TR><TD CLASS="quote">^^^Didn't know it was that common.</TD></TR></TABLE>

x2.

I'm just gonna JB weld it. I thought about duck tape but changed my mind.

 

I hope your not serious. I would have it pressure checked by another; reputible machine shop.

 

do not jb weld it

 

I'm gonna take a chance and run it as is. If it ***** up then I'll pick up another one.

And for the record, I would never JB weld it.

 

I would like to know what casues this?

 

Thats a common problem on lots of different engines. The cracks usually dont go deep enough to cause any problems. I know on my VW 16v or 20v heads Ive never had a problem with those cracks.

 

Those cracks ain't ****, bolt that head on and forget about it..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TwoKSiR &raquo;</TD></TR><TR><TD CLASS="quote">I would like to know what casues this?</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MAX_CFM &raquo;</TD></TR><TR><TD CLASS="quote">its usally from being overheated or running with the plugs loose </TD></TR></TABLE>

?

 

Its because the area between the spark plug and valve seat is thin and normal driving would cause it to crack over several heat cycles.

 

Ask Endyne. They weld a lot of heads. Maybe they can help you. While this you can use the time for some porting.