Cracked heads? Small cracks between valve seats
11-30-2006, 03:06 PM
#1
TECH Resident
Thread Starter
iTrader: (7)
Join Date: Dec 2004
Location: Arlington, Texas
Posts: 850
Likes: 0
Received 0 Likes
on
0 Posts
Cracked heads? Small cracks between valve seats I bought a set of heads from a member here a few weeks ago and decided to get a valve job done before I install them. Shop calls me yesterday and tells me that there were a coupe small cracks between some of the valve seats. He says they see this fairly often and its nothing too likely to be major but I asked them to do a pressure test anyways, no results yet.. Anyone else heard of this happening on newer model aluminum heads?
Thanks guys,
Lurius
Thanks guys,
Lurius
11-30-2006, 11:20 PM
#2
TECH Enthusiast
Join Date: Jul 2006
Location: San Diego
Posts: 638
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Lurius
I bought a set of heads from a member here a few weeks ago and decided to get a valve job done before I install them. Shop calls me yesterday and tells me that there were a coupe small cracks between some of the valve seats. He says they see this fairly often and its nothing too likely to be major but I asked them to do a pressure test anyways, no results yet.. Anyone else heard of this happening on newer model aluminum heads?
Thanks guys,
Lurius
Thanks guys,
Lurius
Trending Topics
12-01-2006, 04:22 PM
#8
TECH Resident
Thread Starter
iTrader: (7)
Join Date: Dec 2004
Location: Arlington, Texas
Posts: 850
Likes: 0
Received 0 Likes
on
0 Posts
Well, I got a call back. Good news: They are fine. He said he got a good look at the port job and said it is one of the ebst hes seen in a while.. Looking forward to seeing what the motor will do with those heads now!
-Lurius
PS: I asked him,and he reccomended they strip the heads and tig weld cracks, though they tested ok and welding only if it WAS leaking.
-Lurius
-Lurius
PS: I asked him,and he reccomended they strip the heads and tig weld cracks, though they tested ok and welding only if it WAS leaking.
-Lurius
12-01-2006, 10:40 PM
#11
happens alot. guy I know will machine out one valve seat, IE the exhaust, Install an oversize seat with a flange, then machine the intake one overlapping the exhaust where they meet. So you have a figure 8 deal-e-o where one sits in another, but the valves are the same distance apart. maybe you could look into that. if they're not leakign i wouldnt really worry about it.
12-02-2006, 12:23 AM
#12
TECH Senior Member
Well such stress fractures will only expend under use, much more so if used with a power adder.
IMO, remove seats, weld, machine for new seats and reinstall. It is not a big issue and easily fixed, but I wouldn't run those on a high performance application as is.
IMO, remove seats, weld, machine for new seats and reinstall. It is not a big issue and easily fixed, but I wouldn't run those on a high performance application as is.
12-02-2006, 03:31 PM
#13
TECH Resident
Thread Starter
iTrader: (7)
Join Date: Dec 2004
Location: Arlington, Texas
Posts: 850
Likes: 0
Received 0 Likes
on
0 Posts
Im going to take a look at them in a couple days and i'll run those ideas by the guys and see if they feel it to be worth the trouble. They seem to be pretty knowledgable, shops been there 30 years.
-Lurius
-Lurius
12-07-2006, 08:49 AM
#14
TECH Regular
iTrader: (14)
Join Date: Oct 2005
Location: Dayton, Ohio
Posts: 437
Likes: 0
Received 0 Likes
on
0 Posts
If this is going on a stock power motor and you want to try something cheap. There are additives that claim so seal a block up, seal heads up, and even fix problems like blown head gaskets.
