*JZ*
Senior Member
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These are our new prototype 3V race head. These have twice the air velocity of our stage 3 ported heads. That is all the information I have on them as of right now. We have more info, I just don't have access to it currently.

Nice - when you get access to the info (you can PM me if you like) - can you let me know what upgrades are done to the train, specifically, what spring/rate you are using, what valves, and any extra 'work' done to the valves and seats?
How are you doing on head gaskets? With big boost, Mihovitz was seeing an issue with lifting the heads and came up with this bitchin' O-ring type set-up for the gaskets.
Have you determined how/why the head was cracking?
Sounds like a plan.
"X" heads![]()

i have not had any trouble with gaskets. the crack is in an exhaust port. we determined last year it cracked from being ported to thin. tony said he could fix it and it would be ok. but it has shown its head again.
Let me apologize for the delay in getting back to you. While I strive to try and get back to all phone calls and emails with in a 24 hour period sometimes the volume and time spent working with customers can be overwhelming. I tend to just go on a first come first serve basis and don't want to short change anybody, so if somebody needs help than I'm going to try to help them until whatever questions, problems, etc. get solved. Rick and the other guys do a great job helping me but the nitty gritty tech stuff is just me so I do what I can.
Anyways though just wanted to explain the delay. You are just as important as every other customer we have. That was why I kept calling after leaving voicemails. lol
I'm still very interested in seeing more info on this cracking issue with the exhaust port. It is something I have not seen before in any of our heads and I'm curious as to where the crack is and what conditions, boost, RPM, etc. are causing it. Even if you don't want to use our heads in the future I would still like to figure out what is going on with the heads you have. My assumption is something in your configuration and or application is pushing the heads beyond what that specific area of the port is capable of holding up to over the long term. Not your fault but definitely something I would like to look at in more depth.
My last voicemail I left in regards to just letting me know when I can call still applies. I am in here on Saturday morning trying to play catch up usually on phone calls, emails and tech help. I don't want to call anybody to early though on their Saturday so just let me know when via PM or email or whatever works for you and we can chat on the phone.
Thanks
Thats how it is in the car business right now..We cant afford to piss off one customer at this point, we need all the posotive advertising we can get..
Thats how it is in the car business right now..We cant afford to piss off one customer at this point, we need all the posotive advertising we can get..
i will say to you what i said to rick. i understand busy. but in this economy nobody is that busy.