Valve seat replacment question...
Thread Starter
Melting Slicks
Joined: Mar 1999
Posts: 2,830
Likes: 20
From: Las Vegas Nevada
Valve seat replacment question...
How much (roughly) should I expect to pay to have the valve seats replaced in my 118 heads?
Also, if I'm going to have the seats replaced is it worth it to go to larger valves? Again can anyone give an approximation on the cost of the two jobs?
thanks,
Brian
Also, if I'm going to have the seats replaced is it worth it to go to larger valves? Again can anyone give an approximation on the cost of the two jobs?
thanks,
Brian
Drifting
Joined: Mar 2005
Posts: 1,923
Likes: 0
From: GA
I've seen where people have paid from $500 to $1400 for the valve seal job.
Between that and the cost of having larger valves put in the heads, you could buy and install a set of Trickflows and/or AFR's heads.
Figure about $1K + to do the larger valves.
Between that and the cost of having larger valves put in the heads, you could buy and install a set of Trickflows and/or AFR's heads.
Figure about $1K + to do the larger valves.
Le Mans Master
Joined: Oct 2004
Posts: 5,841
Likes: 19
From: CLT, North Carolina
If you are going to larger valves you may not have to replace the seats unless you are doing it to get hardened seats. By the way, get a good head shop with an experienced machinist to install those seats. The interference fit has to be right and it is an easy job to botch. An average automotive machinist may not have the skills to do the quality you want.
Regards, Greg
Regards, Greg
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
If you mean #113 heads ('88-'91 L98s) you can go up to 2.00/1.56 with stock size seats; going to 2.02/1.60 require new (larger seats).
You will likely not see much if any gain from larger valves alone.
If going into the heads, price out:
-new seats
-larger valves
-new bronze guides
-3-angle or 5-angle valve job
-some pocket porting and some intake unshrouding in the chamber
BTW, if you have a damaged valve seat or two, possibly they can be machined instead of replaced??
You will likely not see much if any gain from larger valves alone.
If going into the heads, price out:
-new seats
-larger valves
-new bronze guides
-3-angle or 5-angle valve job
-some pocket porting and some intake unshrouding in the chamber
BTW, if you have a damaged valve seat or two, possibly they can be machined instead of replaced??
Thread Starter
Melting Slicks
Joined: Mar 1999
Posts: 2,830
Likes: 20
From: Las Vegas Nevada
Thanks for the replies -
65ZO1 hit it right on the head. I should have been more specific in my question (although I was curious how much all new seats cost) I just nicked two of my seats while I was porting my heads. Unfortunatley to get in to the bowls I had to do some work without old valves in to protect the seats.
I was a little concerned before but looking at it now I am sure they can be repaired. I **just** nicked them, and the seats look to be in excellent condition otherwise.
Thanks for the help everyone,
Brian
65ZO1 hit it right on the head. I should have been more specific in my question (although I was curious how much all new seats cost) I just nicked two of my seats while I was porting my heads. Unfortunatley to get in to the bowls I had to do some work without old valves in to protect the seats.
I was a little concerned before but looking at it now I am sure they can be repaired. I **just** nicked them, and the seats look to be in excellent condition otherwise.
Thanks for the help everyone,
Brian
Le Mans Master
Joined: Oct 2004
Posts: 5,841
Likes: 19
From: CLT, North Carolina
Choose Wisely
The nicks will disappear if you install larger (with-in reason) valves. I would not recommend bronze guides for the street. They are more suited to competition engines because they allow tighter valve stem to guide clearances which is better for valve control but not so good for wear. We use them in our competition engines because the engines come back down after every race where long term durability is not an issue. I have seen them wear excessively after only a few thousand miles on the street. You don't want to spend a lot of money on parts that will soon wear out. A five angle valve job is a sales gimmick. Any good valve seat that flows a lot of air will have one valve seat angle with hand blended top and bottom cuts. The trick is in knowing what the angles want to be and it's not always 30-45-60.
Regards, Greg
Regards, Greg
