want to get stage 5 headwork done.
P&P, oversized valves,tri angular etc..
also an approx. cost....and how long would it take?



thanks!

 

Not sure what a Stage 5 would consist of. We have our top of the line head and call it a Stage 3.

This is what it has:

Upgraded SS coated valves
Ported and polished
Upgraded springs
Milled for perfectly flat finish
Stainless steel o-rings installed for better head gasket seal at the combustion chamber
New guides (if needed) and seals


We flow tested and did a bunch of testing over a year ago to come up with a combination that would work well.

We gained 27% more flow on the intake side at 100 lift and 20% at 500, so the gains are across the board and on the exhaust side we gained between 5% at 100 lift and 21% at 500.

There isn't an EVO cam on the market that lifts the valve to .500 so you guys know. Most are only around .440 lift. We flow them only up to .500. Many guys will flow a head up .600 or so and then make some crazy claims and end up with a head that is just hogged out inside to give big numbers at high lifts that the car will never see.

It is important to get a head that flows in the lift ranges it actually sees.

This particular head for the EVO is $1650 with your core and we can have it back to you within 2 weeks from us getting it.

David Buschur
www.buschurracing.com

 

would you also do oversized valves,titanium retainers etc..?

 

The buschur deal sounds good.

You can also visit www.portflow.com

speak to tom, the owner. He can get through heads quickly. He uses alll serdi equipment, as used by leading F1 engine build shops. Tom has over 20 years of racing experience & has primarily built championship wining cylinder heads for engines run in CART & the IMSA series before forming his own company.

 

thanks for the assistance guys.
just checking out my options

 

Different questions on the same topic:

David, Is there a trade-off using the stage 3 head? In other words, would I lose anything using a stage3 head on my car?
Also, would I need a larger throttlebody and intake manifold to use a stage 3 head?

Head tuning is not one of my strongest areas...

 

That price includes titanium retainers, sorry didn't list it. The valves, yes I can go oversize if that is what you want. We have found that the stock size valve, with a re-designed stem and back side of the valve flows better at the under .450 lift ranges. Also with the relatively small bore size of the engine we also find that the oversized valves get shrouded from the cylinder walls.

You do not need a bigger throttle body or intake to use the head. There is also no trade off that is why we concentrated on the low lift areas also.

david Buschur
www.buschurracing.com

 

Hey you might PM joeycoates. He does good head jobs. He even did his own!

 

Buschur Racing
Forrester Racing Heads
Jackson Auto Machine

I'd say $1500-$2000 with a two to four week turnaround time.

 

Does that mean he is extremely flexible?

 

sorry for my ignorance...
but why is it that other vendors use the 1mm oversized valves...?
or is it just a personal preference thing?
from what I have read I know that u are very good at what u do.and i was reading about the stage 3 head on your website and all the values u have found.
was just wondering why other people go for oversized.cause I'm sure they must have researched like you did...
or did they..lol


anyways...thanks for the quick responses.
they are very much appreciated!

 

A-ha, or did they? Did they build a flow bench fixture the same diameter and length of an actual 4g63 cylinder for testing? I wonder if everyone goes to the same length as we do for testing on products? From our performance history I would say, no.

David Buschur
www.buschurracing.com

 

There isn't much of an advantage at all to overstuffing 1mm valves into a head if you don't port behind it and open up behind the seats (which hardly anyone does because it takes a ton of time.) Otherwise, you are just adding more valvetrain weight with little to no benefit. I believe Buschur has gone 7s on a head with stock bore valves so I think their headwork will work for you guys.

 

Actually, whether we do or don't install an oversize valve in the head we spend a ton of time behind the valve, in the area you are talking about Mike. There is a lot of power and flow to he had there. When the seats are cut we maximize that area with the valve machine and cut it with the tool. From there it is hand ported.

David Buschur
www.buschurracing.com

 

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