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Old 08-05-2008, 09:10 PM   #1
ExecNav
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Join Date: Nov 2002
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Location: Ellijay, GA
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08 LGT Spec.B
01 Impreza RS-T

Default Typical cost for head rebuild...

So I've given my heads (01 RS SOHC) to a shop and provided them with new cams, springs, retainers, valves, and valve seals. The heads have 100k miles on them but well taken care of, so no major machining. In addition to a rebuild, they're also going to do a 5 angle seat cut. Out of curiosity, what is a typical bottom line for this type of work? I've hired work done for my car one time since I've owned it and have no idea what is a fair price for such work. Thanks.

-Brett
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Old 08-05-2008, 10:28 PM   #2
reddevil
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$200-300 for COMPLETE work from my shop, often less if they don't need to be pressure tested. But they don't do 5 angle grinds.
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Old 08-06-2008, 12:05 AM   #3
ExecNav
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So let's say the guy doing the work does everything to absolute precision, is extremely seasoned in building very high-powered race motors, has plenty experience building Subaru motors specifically (for airplanes as well)...

Would it be reasonable for said shop to charge say, $600-$1000 for a rebuild with the grind? I don't know exactly what is involved with properly rebuilding a head but I've been reading that $200-$300 seems to be the norm. So can the same precision this individual boasts in his $600+ job typically be found in a $300 job?

-Brett
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Old 08-06-2008, 03:05 AM   #4
reddevil
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IMO, you are getting ripped a new *******. Unless they are porting and polishing them, there is no reason to charge that much, exspecially a flipping grand! Not to mention you are supplying ALL the parts.

The only thing I can see costing money is the 5 angle grind. And maybe that is why its so exspensive, as I have never paid for that. But then again, I would do a port and polish WAY before a 5 angle grind for that money.

IF I just need a valve grind with new seal installed, I am typically paying less than $200, but that is a shop I have been dealing with for a while.... But still, a grand?
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Old 08-06-2008, 03:18 AM   #5
reddevil
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So I started reading up a little on the "5 angle grind"

Quote"

MULTI-ANGLE VALVE JOB
A multi angle valve job is the cutting or grinding of 2 or more angles on the seat and valve. The purpose of a multi angle valve job is to improve airflow. By now you have probably heard of 5 angle and radius valve jobs. The truth, this is more applicable in the American iron heads. There just isnt enough material in the small diameter seats or valves to see any real noticeable differences on a flow bench. A .5% gain maybe seen on a flowbench but the flowbench has a plus or minus error factor that has to be eliminated before a true flow figure can be attained. Older American iron heads may benefit from a five angle or radius valve job but only because the head is so bad to begin with. The Honda head is diffrent. Our flowbench testing has proven time after time that the correct angles and angle widths is what is important. More CFM gains have been made through this procedure than applying 5 angles or radiuses.

Endquote

So I would NOT do the 5 angle grind unless you are going 200% for that extra 2hp....
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Old 08-06-2008, 03:25 AM   #6
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Outfront motorsports quoted me $300 for a 3 angle valve job and would include the valve seals and installing my BC cams, Supertech springs and Supertech std sized black nitrided intake and inconel exhaust valves with a 3 day turn around time. This shop only deals with Subaru motors builds, but for Sand rails.

Portflow quoted me $500 including a 45 angle cut closer to the edge going into a radius. Tom from Portflow says just with the valve job it is like going 1mm over on the valves. This will include pressure testing the heads. They are definitely well versed as far as headwork especially with Honda heads and currently do all Subaru head work for Crawford Performance. This includes installation of all the parts above and I have to bring my own valve seals which is no problem since it came with my gasket rebuild kit from the dealer. Both are with no portwork.
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Old 08-06-2008, 03:27 AM   #7
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Quote:
Originally Posted by reddevil View Post
So I started reading up a little on the "5 angle grind"

Quote"

MULTI-ANGLE VALVE JOB
A multi angle valve job is the cutting or grinding of 2 or more angles on the seat and valve. The purpose of a multi angle valve job is to improve airflow. By now you have probably heard of 5 angle and radius valve jobs. The truth, this is more applicable in the American iron heads. There just isnt enough material in the small diameter seats or valves to see any real noticeable differences on a flow bench. A .5% gain maybe seen on a flowbench but the flowbench has a plus or minus error factor that has to be eliminated before a true flow figure can be attained. Older American iron heads may benefit from a five angle or radius valve job but only because the head is so bad to begin with. The Honda head is diffrent. Our flowbench testing has proven time after time that the correct angles and angle widths is what is important. More CFM gains have been made through this procedure than applying 5 angles or radiuses.

Endquote

So I would NOT do the 5 angle grind unless you are going 200% for that extra 2hp....
Who is this quote from and what would be the correct angles and angle widths this shop would recommend?
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Old 08-06-2008, 08:26 PM   #8
cueball89
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I was charged $400 for a complete valve job(4 and 5 angle). I had new valve keepers and vavle seals installed. I brought the heads to the guy without the cams and he knocked the price down abit. He does all the heads for the local subaru dealer.
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Old 08-06-2008, 09:22 PM   #9
methaddict
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Full Race TS, BW 8374 EFR

Default

Quote:
Originally Posted by methaddict View Post
Who is this quote from and what would be the correct angles and angle widths this shop would recommend?
I found out this quote is from Alaniz cylinder head technologies, famous for doing Honda heads. I gave him a call and asked his opinion about different valve seats and his recommendations. He said a 5 angle was basically a radius. He also said a 3 angle will creat a venturi affect and will have more flow at mid lift. Alaniz said he uses a Sonnen. He charges $375.
I called Tom at Portflow again and he said Alaniz to his knowledge didn't have the tooling to do a radius. Tom has the cutters and the Serdi valve seating machine to do this. He says he uses this cut in all his race motors and creates enough flow as much as going 1mm larger valves do. When I was at the shop he showed me if you went 1mm over the valve would be too close to the edge of the combustion chamber and would have to be opened up. So I left my parts and heads at Portflow. $500 will be well spent. They also vacum test after every valve job.
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