[Z06] Precision Race Components SEE Why We Build Superior Cylinder Heads!
12-14-2012, 09:55 AM
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Precision Race Components SEE Why We Build Superior Cylinder Heads!
Precision Race Components SEE Why We Build Superior Cylinder Heads!
As cylinder head customers, you have a lot of choices in what you can purchase. There are a lot of
different options to choose from, and when you research various companies and options online, you
try to get a feel for who you can trust. While our company does have a strong online presence, we
want all of our current and potential customers to have more than a good feeling about where their
products come from. We want everyone to SEE where they come from! There is a lot that goes into
our cylinder head production, not just in designing the castings but all the way to the finished product
that you receive. We have been machining and building LS-based cylinder heads since 2004, and we
have countless hours in research and development to bring our products to our customers. We ONLY
specialize in LS-based cylinder heads! We do not divide our time between multiple platforms. All of our
time and money is spent on building the best LS-based cylinder heads available! While you can read a
lot on how well a companys product performs, you do not always get the chance to see what type of
operation is in place to produce YOUR cylinder heads. We are going to take you through a tour of our
cylinder head production, the operation, what goes into our products, and why we do it so you can fully
understand why Precision Race Components is the correct choice for your cylinder heads!
Our machining center houses all of our machines for our cylinder head and engine programs. This
center is 5,000 sq. ft. of our 25,000 sq. ft. facility, and all of our CNC cylinder heads are machined on
Haas 5-axis CNC machines. We have two HS1s and one ES5. Each machine is dedicated to a specific line
of cylinder heads: one for cathedral-port aftermarket castings, one for LS3 and LS7 aftermarket castings,
and one for GM castings. We strive to have the vast majority of the most popular cylinder heads in
stock! Anything that is not in stock can typically be built within two to three business days.
All of our cylinder heads are valve jobbed on our Newen single-point CNC seat and guide machines.
We use two of these machines, one for intake and one for exhaust. This allows us to streamline the
production of our cylinder heads, which helps not only with time but precision as well. We also use
the Newen machines to ream the guides for all of our aftermarket castings. Many other machine
shops will use a drill in a parts washer to ream the guides, which can prove to be very inaccurate. All of
our machining process uses the best machines available to build the best product available. We hold
tolerances to less than .0001!
All of our valve jobs are custom-drawn for our cylinder heads specifically, and the Newen machines
complete the valve job with precision. We use a 5-angle valve job on our cylinder heads, and valve jobs
that could take an hour or more to cut on older, traditional machines can take as little as 90 seconds on
our machines! We have $200,000 invested in our two seat and guide machines alone! This is a perfect
example of how we go above and beyond to build the absolute best product on the market! Each
machine will also check the run-out on the seat to confirm that the valve job was performed correctly
and the machined surface of the seat is 100% round.
Every set of cylinder heads gets pressure-checked before leaving our facility. What this does is pull
vacuum through the port to verify that the valves completely seal when closed. Every port of every
set of cylinder heads is checked with the valve in place but without a spring kit installed. The pressure
of the valve spring will force most valves to seal against the seat, but the key is to make sure it seals
without the help of the valve springs. The precision accuracy of the valve job is vital to valves that
seal properly, and it is also crucial to air flow. You can lose 20 CFM or more if the valve job is not done
properly!
We use a Haas VF3 3-axis CNC machine for nothing but cylinder head milling. Every set of cylinder heads
is milled to ensure a 100% straight and level deck surface. This provides you with a quality seal against
the head gasket. Every set of heads is machined to match the customers setup! We mill each set of
cylinder heads for a specific size camshaft. So, if you are running a 224/224 cam, you will receive more
milling than if you were to run our MS4 (239/242) cam. We stock all of our cylinder heads with various
mill numbers, so we will most likely have multiple sets of heads in stock that will match your setup!
We know the exact piston-to-valve clearance with all of our camshafts, so this allows us to provide
our customers with maximum compression given the constraints of their p-to-v clearance. We also do
NOT charge for the additional milling! Whether we are performing a .003 clean-up mill or cutting the
surface .030, you will not pay any additional money. We want every set of cylinder heads to be perfect
for your setup, so you will always achieve maximum power results. We will not leave any power on the
table!
For the PRC dual valve spring kits, all seat bases and titanium retainers are machined on a Haas CNC
lathe. We do not use outsourced or overseas parts, which allows us to set both our .650 and EHT .675
valve spring kit up with an install height of 1.810. We do see a little variance in the installed height
when using factory GM valves, but any of our cylinder heads with stainless steel valves will have very
minimal variance, if any at all. The valve springs that we use for both our .650 and EHT .675 are NOT
the same, old gold valve springs that you find with other vendors. The old gold valve spring is a
weaker design with less closed and open pressures, and they have proven to lose their installed height
with as little as 15,000 miles! The PRC valve springs are ONLY used by us, and they were specifically
designed for us. Our valve springs were spintron tested against other major valve spring suppliers in the
LSx market, and the PRC springs not only retained their closed and open pressures for more cycles than
any other valve spring but they also did not lose ANY of their installed height! As with ALL components
of the Precision Race Components product line, every piece in our valve spring kits are built in the USA!
Throughout each production run, we randomly pull cylinder heads to not only verify the quality control
processes that were in place to that point but to also verify that the cylinder heads flow exactly what
they are advertised to flow! It is VERY important to understand that there is a correct and incorrect
way to flow cylinder heads. You must have the correct bore plate, you must use a consistent unit of
measurement (we measure flow at 28.0 of water), and you MUST have a radiused inlet on the intake
ports! We use a Superflow SF-600 flow bench for all of our air flow testing, and we use clay to create
a radiused inlet. The radiused inlet is so important when testing intake ports because the sharp edge
of the port will create a disturbance and show much lower flow numbers. You have to remember that
when the engine is running, the intake manifold is against the intake port and the lip of the cylinder
head is not a factor at that point.
All PRC cylinder heads are designed to be the best possible right out of the box. Our cylinder heads do
NOT require any additional hand porting or reworking for better flow! Any cylinder heads that require
additional work out of the box are not providing you with the best performance possible! The CNC
marks in the intake and exhaust runners do NOT need to be smoothed out. What looks good to the eye
does not always equate to better performance and power! We have actually tested this theory many
times on multiple cylinder heads of ours, and each time nets zero gains. If a set of cylinder heads need
additional work out of the box, the company did not do their job on properly designing or digitizing the
cylinder heads.
We have multiple quality control checks in place throughout the machining and assembly process to
ensure that every set of cylinder heads is completed with precision accuracy for maximum performance
and durability. From start to finish, we use nothing but the best equipment and staff to provide you
with the best products available. You will not find another company that is more dedicated to building
your LSx cylinder heads! We house over $500,000 of CNC machines that are dedicated to building the
Precision Race Components cylinder heads. Dont rely on only an online presence to decide who
will build your cylinder heads. You can determine a companys overall success rate and customer
service by reading online, but it will never provide you with the full picture. How clean is their facility?
What quality control processes are in place? Where do they source their products from? You need
to KNOW that your cylinder heads are built using the best parts, machines, and processes available
today. You should research very carefully and ask where and how your cylinder heads are machined
and assembled! We are very proud of our product offerings, and we are very thankful to all of our
customers for allowing us to succeed. As we continue to grow, we will not sacrifice power, accuracy,
or durability. When you purchase Precision Race Components products, you purchase the BEST on the
market!
As cylinder head customers, you have a lot of choices in what you can purchase. There are a lot of
different options to choose from, and when you research various companies and options online, you
try to get a feel for who you can trust. While our company does have a strong online presence, we
want all of our current and potential customers to have more than a good feeling about where their
products come from. We want everyone to SEE where they come from! There is a lot that goes into
our cylinder head production, not just in designing the castings but all the way to the finished product
that you receive. We have been machining and building LS-based cylinder heads since 2004, and we
have countless hours in research and development to bring our products to our customers. We ONLY
specialize in LS-based cylinder heads! We do not divide our time between multiple platforms. All of our
time and money is spent on building the best LS-based cylinder heads available! While you can read a
lot on how well a companys product performs, you do not always get the chance to see what type of
operation is in place to produce YOUR cylinder heads. We are going to take you through a tour of our
cylinder head production, the operation, what goes into our products, and why we do it so you can fully
understand why Precision Race Components is the correct choice for your cylinder heads!
Our machining center houses all of our machines for our cylinder head and engine programs. This
center is 5,000 sq. ft. of our 25,000 sq. ft. facility, and all of our CNC cylinder heads are machined on
Haas 5-axis CNC machines. We have two HS1s and one ES5. Each machine is dedicated to a specific line
of cylinder heads: one for cathedral-port aftermarket castings, one for LS3 and LS7 aftermarket castings,
and one for GM castings. We strive to have the vast majority of the most popular cylinder heads in
stock! Anything that is not in stock can typically be built within two to three business days.
All of our cylinder heads are valve jobbed on our Newen single-point CNC seat and guide machines.
We use two of these machines, one for intake and one for exhaust. This allows us to streamline the
production of our cylinder heads, which helps not only with time but precision as well. We also use
the Newen machines to ream the guides for all of our aftermarket castings. Many other machine
shops will use a drill in a parts washer to ream the guides, which can prove to be very inaccurate. All of
our machining process uses the best machines available to build the best product available. We hold
tolerances to less than .0001!
All of our valve jobs are custom-drawn for our cylinder heads specifically, and the Newen machines
complete the valve job with precision. We use a 5-angle valve job on our cylinder heads, and valve jobs
that could take an hour or more to cut on older, traditional machines can take as little as 90 seconds on
our machines! We have $200,000 invested in our two seat and guide machines alone! This is a perfect
example of how we go above and beyond to build the absolute best product on the market! Each
machine will also check the run-out on the seat to confirm that the valve job was performed correctly
and the machined surface of the seat is 100% round.
Every set of cylinder heads gets pressure-checked before leaving our facility. What this does is pull
vacuum through the port to verify that the valves completely seal when closed. Every port of every
set of cylinder heads is checked with the valve in place but without a spring kit installed. The pressure
of the valve spring will force most valves to seal against the seat, but the key is to make sure it seals
without the help of the valve springs. The precision accuracy of the valve job is vital to valves that
seal properly, and it is also crucial to air flow. You can lose 20 CFM or more if the valve job is not done
properly!
We use a Haas VF3 3-axis CNC machine for nothing but cylinder head milling. Every set of cylinder heads
is milled to ensure a 100% straight and level deck surface. This provides you with a quality seal against
the head gasket. Every set of heads is machined to match the customers setup! We mill each set of
cylinder heads for a specific size camshaft. So, if you are running a 224/224 cam, you will receive more
milling than if you were to run our MS4 (239/242) cam. We stock all of our cylinder heads with various
mill numbers, so we will most likely have multiple sets of heads in stock that will match your setup!
We know the exact piston-to-valve clearance with all of our camshafts, so this allows us to provide
our customers with maximum compression given the constraints of their p-to-v clearance. We also do
NOT charge for the additional milling! Whether we are performing a .003 clean-up mill or cutting the
surface .030, you will not pay any additional money. We want every set of cylinder heads to be perfect
for your setup, so you will always achieve maximum power results. We will not leave any power on the
table!
For the PRC dual valve spring kits, all seat bases and titanium retainers are machined on a Haas CNC
lathe. We do not use outsourced or overseas parts, which allows us to set both our .650 and EHT .675
valve spring kit up with an install height of 1.810. We do see a little variance in the installed height
when using factory GM valves, but any of our cylinder heads with stainless steel valves will have very
minimal variance, if any at all. The valve springs that we use for both our .650 and EHT .675 are NOT
the same, old gold valve springs that you find with other vendors. The old gold valve spring is a
weaker design with less closed and open pressures, and they have proven to lose their installed height
with as little as 15,000 miles! The PRC valve springs are ONLY used by us, and they were specifically
designed for us. Our valve springs were spintron tested against other major valve spring suppliers in the
LSx market, and the PRC springs not only retained their closed and open pressures for more cycles than
any other valve spring but they also did not lose ANY of their installed height! As with ALL components
of the Precision Race Components product line, every piece in our valve spring kits are built in the USA!
Throughout each production run, we randomly pull cylinder heads to not only verify the quality control
processes that were in place to that point but to also verify that the cylinder heads flow exactly what
they are advertised to flow! It is VERY important to understand that there is a correct and incorrect
way to flow cylinder heads. You must have the correct bore plate, you must use a consistent unit of
measurement (we measure flow at 28.0 of water), and you MUST have a radiused inlet on the intake
ports! We use a Superflow SF-600 flow bench for all of our air flow testing, and we use clay to create
a radiused inlet. The radiused inlet is so important when testing intake ports because the sharp edge
of the port will create a disturbance and show much lower flow numbers. You have to remember that
when the engine is running, the intake manifold is against the intake port and the lip of the cylinder
head is not a factor at that point.
All PRC cylinder heads are designed to be the best possible right out of the box. Our cylinder heads do
NOT require any additional hand porting or reworking for better flow! Any cylinder heads that require
additional work out of the box are not providing you with the best performance possible! The CNC
marks in the intake and exhaust runners do NOT need to be smoothed out. What looks good to the eye
does not always equate to better performance and power! We have actually tested this theory many
times on multiple cylinder heads of ours, and each time nets zero gains. If a set of cylinder heads need
additional work out of the box, the company did not do their job on properly designing or digitizing the
cylinder heads.
We have multiple quality control checks in place throughout the machining and assembly process to
ensure that every set of cylinder heads is completed with precision accuracy for maximum performance
and durability. From start to finish, we use nothing but the best equipment and staff to provide you
with the best products available. You will not find another company that is more dedicated to building
your LSx cylinder heads! We house over $500,000 of CNC machines that are dedicated to building the
Precision Race Components cylinder heads. Dont rely on only an online presence to decide who
will build your cylinder heads. You can determine a companys overall success rate and customer
service by reading online, but it will never provide you with the full picture. How clean is their facility?
What quality control processes are in place? Where do they source their products from? You need
to KNOW that your cylinder heads are built using the best parts, machines, and processes available
today. You should research very carefully and ask where and how your cylinder heads are machined
and assembled! We are very proud of our product offerings, and we are very thankful to all of our
customers for allowing us to succeed. As we continue to grow, we will not sacrifice power, accuracy,
or durability. When you purchase Precision Race Components products, you purchase the BEST on the
market!
12-14-2012, 11:10 AM
#4
"Precisions Race Components is legally a separate company from Texas Speed & Performance. All distribution of PRC products is handled through TSP. They have the same ownership. Both are here at our new facility in Lubbock, Texas. "
12-14-2012, 11:29 AM
#5
Burning Brakes
12-14-2012, 12:42 PM
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12-14-2012, 12:56 PM
#8
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No sir, we have been a major parts dealer in the LS market for 10 years. We also have been forum sponsors for 7+ years. This is more of an update to make sure every one knows the type of quality we put into our work.
12-14-2012, 12:57 PM
#9
Drifting
In any case, lets do a group buy, i can tell you many of us would be interested, what do you say sir?
Thx
12-14-2012, 01:10 PM
#12
Safety Car
Since maybe the other thread is gonna die I'll post it again in this thread lol so I can get an answer
Nice to see this, just had a set of your PRC 265 Heads with the .675lift springs put on my C6Z. They looked top notch, nice to see they actually are.
How long can I run the valve springs for before needing to be replaced? I have the stock cam in my car
Nice to see this, just had a set of your PRC 265 Heads with the .675lift springs put on my C6Z. They looked top notch, nice to see they actually are.
How long can I run the valve springs for before needing to be replaced? I have the stock cam in my car
12-14-2012, 01:10 PM
#13
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If these heads will cure all the valvetrain worries we have with the LS7 you guys will sell a lot of them. It would be nice to see a head built to satisfy the (small, maybe tiny) need for a "stock" head which is what I need.
12-14-2012, 02:37 PM
#16
Melting Slicks
Just ordered a set of 265's with Ti intake / SS exhaust.
They had these in stock and are shipping today, they even offered to mill them and would still have them out today.
Beats waiting 3-4 weeks for a set.
They had these in stock and are shipping today, they even offered to mill them and would still have them out today.
Beats waiting 3-4 weeks for a set.
12-14-2012, 03:11 PM
#17
Safety Car
12-14-2012, 03:47 PM
#18
Team Owner
If I throw a set of your heads on instead of reworking my LS7 heads will I need a tune. Everything is completely stock and will remain that way.
DH
Last edited by Dirty Howie; 12-14-2012 at 03:50 PM.
12-14-2012, 03:50 PM
#19
Team Owner
Since maybe the other thread is gonna die I'll post it again in this thread lol so I can get an answer
Nice to see this, just had a set of your PRC 265 Heads with the .675lift springs put on my C6Z. They looked top notch, nice to see they actually are.
How long can I run the valve springs for before needing to be replaced? I have the stock cam in my car
Nice to see this, just had a set of your PRC 265 Heads with the .675lift springs put on my C6Z. They looked top notch, nice to see they actually are.
How long can I run the valve springs for before needing to be replaced? I have the stock cam in my car
DH
12-14-2012, 03:51 PM
#20
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Since maybe the other thread is gonna die I'll post it again in this thread lol so I can get an answer
Nice to see this, just had a set of your PRC 265 Heads with the .675lift springs put on my C6Z. They looked top notch, nice to see they actually are.
How long can I run the valve springs for before needing to be replaced? I have the stock cam in my car
Nice to see this, just had a set of your PRC 265 Heads with the .675lift springs put on my C6Z. They looked top notch, nice to see they actually are.
How long can I run the valve springs for before needing to be replaced? I have the stock cam in my car
