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We are in the process of designing our site, so please bear with us. Until then, we will make the introduction of our products here.
Now: GT Motorsports® VQ35DE Heads
We offer 5 stages of head upgrades. Here is what each features:
Stage 0:
Cleaning and inspecting cylinder head
Resurface cylinder head with an RA finish
Radius/5 angle valve job
Pressure testing cylinder head (cylinder head is disassembled completely)
New viton valve stem seals
(OEM valves and springs)
Stage 1:
Cleaning and inspecting cylinder head
Resurface cylinder head with an RA finish
Radius/5 angle valve job
Pressure testing cylinder head (cylinder head is disassembled completely)
New viton valve stem seals
Ferrea® valve springs
Ferrea® titanium retainers, locators, and keepers
Stage 2:
Cleaning and inspecting cylinder head
Resurface cylinder head with an RA finish
Radius/5 angle valve job
Pressure testing cylinder head (cylinder head is disassembled completely)
New viton valve stem seals
New exhaust and intake valve guides (bronze)
Machine spring seat to accept single or dual valve springs
Moderate port and polish
Ferrea® standard-size stainless steel valves
Ferrea® titanium springs (single or dual option)
Ferrea® titanium retainers, locators, and keepers
Flow bench cylinder head
Stage 3:
Cleaning and inspecting cylinder head
Resurface cylinder head with an RA finish
Radius/5 angle valve job
Pressure testing cylinder head (cylinder head is disassembled completely)
New viton valve stem seals
New exhaust and intake valve guides (bronze)
Machine spring seat to accept single or dual valve springs
Ferrea® 1.0mm oversize stainless steel valves
Install new valve seats
Ferrea® dual titanium springs
Ferrea® titanium retainers, locators, and keepers
Flow bench cylinder head
Stage 4:
Cleaning and inspecting cylinder head
Resurface cylinder head with an RA finish
Radius/5 angle valve job
Pressure testing cylinder head (cylinder head is disassembled completely)
New viton valve stem seals
New exhaust and intake valve guides (bronze)
Machine spring seat to accept single or dual valve springs
Ferrea® 1.5mm oversize stainless steel valves
Install new valve seats
Ferrea® dual titanium springs
Ferrea® titanium retainers, locators, and keepers
Flow bench cylinder head
All cylinder head stages include something that no other head manufacturer uses: RA Finishing of the head mating surface. This is a finishing process that ensures the optimal finish for proper sealing of the head gasket. Simply machining the head perfectly flat is not enough. A mirror-like finish is not optimal to proper head gasket sealing. The RA finish puts the right amount of grit onto the surface of the initially machined head, helping it most optimally “bite” into the head gasket when the heads are torqued down to proper specification. This process has been proven by many OEM and performance builders to provide the best sealing possible. Chrysler vehicles, that were notorious for head gasket sealing issues, fixed their already problematic design by factory RA finishing of the heads. Combining this technology with the superior head design of the VQ35DE, allows for the best possible mating of the heads and the block of any internal combustion engine.
Pictures:
Note the first picture below. In the porting process, we machine out the portion of the guide for more superior flow. This has been done on very high end exotic race cars (Porsche). The last picture shows the Stage 4 (most extreme) porting available; note the large size of the port.
Here you can see the flow improvements between the stock and Stage 3 heads, obtained from our testing. This was the final product.
"Cyl 1" designation in the legend of the chart denotes the stock heads, while "Cyl 2" stands for the stage 3 heads, all shown as a function of valve lift. The improvement is evident between the two, to an extreme degree. Notice also that our cams, introduced a few weeks back, have a lift of 0.423"/0.435" (Turbo/NA), allowing the system to actually take advantage of the greater flow (see the chart and where .423-.435 lift falls on the graph).
I am impressed with your work. i cant wait to get mine installed and on the road. i am getting another job to afford all this madness.
__________________
Only when you have lost everything can you truly accomplish anything.
The market can stay irrational longer than you can stay solvent. -John Maynard Keynes
I remember someone stating that these heads flow upwards of 400 cfm per port and I was having a hard time believing it. thanks for showing your numbers!
Here you can see the flow improvements between the stock and Stage 3 heads, obtained from our testing. This was the final product.
"Cyl 1" designation in the legend of the chart denotes the stock heads, while "Cyl 2" stands for the stage 3 heads, all shown as a function of valve lift. The improvement is evident between the two, to an extreme degree. Notice also that our cams, introduced a few weeks back, have a lift of 0.423"/0.435" (Turbo/NA), allowing the system to actually take advantage of the greater flow (see the chart and where .423-.435 lift falls on the graph).
are u sure that's not backwards? looks like the Cyl1 is flowing much more than Cyl2. I'm confused
GT Motorsports® VQ35DE Head Packages
you guys are doing an excellent job in making the 350z on hell of a car .. Thank you
