Its always a good idea to put a better valve spring in that is rated to the RPM needed or at the very least new ones..

 

Please go ahead. I'm listening and find this information very, very interesting. Thanks for sharing.

 

Good info, thanks, keep it coming. So the consensus is that for up to 7500 stock valve train is fine. So since we've bitten into this apple, what valve train modifications are you referring to for a 8000 limit? I haven't really seen anyone talk about or advertise better valve springs but it would seem like stiffer springs would be needed for a higher rev limit? Ideally I'd like to stay away from any custom machining but rather just swap some parts.

 

Thanks for clarifying about the TT vs GT3 crank.
Cheers,
Rob

 

down a slippery slope ...if you are going to do new springs then a custom cam would be a nice bump in overall performance.

 

Why a Custom cam?

 

When I was in my early teens I was building a blower stang and swapping out to a custom cam I got a lot pwr under the curve...peak pwr did not go up too much.. can't recall.

for me it felt great power wise for daily driving where I was alway in mid rpm power band

 

if your going full out build then yeah do a set but if your doing basics, only do the exhaust cam.

 

Yes, I know that's for American muscle..
I don't think builders have custom cams made,,maybe it isn't needed or know one makes them for that level..
I believe mixing and matching some of Porsche's grinds is the ticket?

 

Cams are one if those things people automatically upgrade and sometimes without the research. Muscle cars were so dependent on cams because they did not have the flexibility of variable valve timing cars. Cams are always about compromise one area for another. I often ponder whether cams are overkill on many of the builds I read about that are under 800hp?

 

You design a cam for what you intend to use your car for. As stated above you can't design for everything. Aside from this, what is he biggest benefit of designing and manufacturing your own cam?

I'll leave this open for discussion.

 

I was going to rebuild my 964 Turbo motor but decided not to at this time. However, had I gone that route, I would have either considered an SC cam (noticeable higher low end torque) or a 964 cam ( higher top end---5500 rpm vs 6500 rpm ) or a custom grind (lower-higher).

I now need to find a good reputable shop on the east coast (close to KY) that can build a nice reliable motor?

Any suggestions?

 

These intake cams were made back in the day when people were using GT3 exhaust cam and that was it. We designed and manufactured both the intake and exhaust. These were billet cams with zero harmonic distortion. We had no manufacturer to go to. At the time no one was doing anything with the intake cam. Design and manufacturer cost just under 60K before we had what we wanted.

Since we used billet material we had no idea if the Porsche GT3 hemispherical tappets were compatible material wise so we designed and manufactured our own tappets.

The springs are also very special. This is one item we keep to ourselves. No one is running even close to the low spring pressures we are able to run for a motor that is capable of 9400 redline prior to being reduced by 600 rpm's due to PR. Our seats do not get beat up.

 

Intake and exhaust being flow tested so as to precisely polish to match flow.

 

^engine ****! awesome stuff, want more!!