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.


Availability:
Now
Turnaround Time:
2-4 weeks
Prices: (MSRP)
Stage 0: $1047
Stage 1: $1913
Stage 2: $3693
Stage 3: $4021
Stage 4: $5642


Thank you.

Next: GT Motorsports® Short/Long block packages

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.

 

This is the process of installign the new valve seats.

 

This it the testing process for the RA finish that's put onto the surface of the heads.

 

Some of the end product

 

Some flow bench 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).

 

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.

 

Nice work Sam you guys are doing an excellent job in making the 350z on hell of a car .. Thank you

Maybe you guys can come up with a billet block on day

 

Looks great. Quality work, very impressive. Keep it up Sam.

 

nice stuff, great new products

 

thanks for posting the flow charts.

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!

 

Sam,

Will a n/a engine benefit from any of this? Or are you targeting FI specifically?

 

i must say that im truely impressed with your work Sam and your crew at gtm i just wish the prices wouldnt be so high but again great work

 

Working on any head and cam packages? Would you take a core exchange?

 

This is the only way to make REAL power with any engine. Bolt-ons are just ancillary at this point.

So yes, n/a engines will benefit greatly.

 

Looking Good as always Sam..
Good job on getting the pics up for everyone to see the details of the hard work you guys do.

 

how much more do the stage 4 heads flow compared to the stage 3 heads with the only difference being 1.5 mm instead of 1.0mm valve size increase?

 

same question here ^

 

are u sure that's not backwards? looks like the Cyl1 is flowing much more than Cyl2. I'm confused

 

Head package including cams?

 

What Stage Are Most Of You Guys Doing?