CNC port shops opinions inside.
CNC port shops opinions inside. I recently sent my GM L92 cylinder heads out to be CNCd complete, and have all new valve train installed for my build, well the heads came back and this is what they look like, does anyone see any issues with the CNC work in the intake/exhaust ports. I will not mention at this time the name of the shop, but would like some opinions on there work.
I don't think you can judge how well a head performs/flows by looking at it.
A CNC machine is just a bit on an arm that moves inside the port and removes to the depth programmed on the axis it is told to (very simply). If there isn't metal to be removed due to casting variation, it won't remove something that isn't there. It is very consistent work, but castings vary in shape etc. One casting may require more metal or less to be removed than another.
How did the heads flow?
I say bolt them on and try them. A little bit of metal from the right places often results in better performance than a huge amount being removed for no reason. You don't want a huge port that flows like a turbulent sewer drain.
A CNC machine is just a bit on an arm that moves inside the port and removes to the depth programmed on the axis it is told to (very simply). If there isn't metal to be removed due to casting variation, it won't remove something that isn't there. It is very consistent work, but castings vary in shape etc. One casting may require more metal or less to be removed than another.
How did the heads flow?
I say bolt them on and try them. A little bit of metal from the right places often results in better performance than a huge amount being removed for no reason. You don't want a huge port that flows like a turbulent sewer drain.
Are your heads L29s or Cathedral port? I have a set of 5.3 stage 3 TEAs cathedral port and they are some awsome heads, and they perform like no other, TEA was my first choice, but getting them to return phone calls is like calling Obama...lol
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Staging Lane
Joined: Nov 2006
Posts: 92
Likes: 0
From: Souther Minnesota
Exactly! but this shop does not give flow #s with there heads, just a basic CAD photo of what he claims they flow, I am having them flowed to compare to his chart, funny no flow chart, Its like buying a new car and not getting a title...lol
[QUOTE=Tireburnin;14350349]
How did the heads flow?
QUOTE]
Very good question, maybee you can tell me what yours flowed, and I could get a basic idea, I did not get any info, even after asking for it...strange!
How did the heads flow?
QUOTE]
Very good question, maybee you can tell me what yours flowed, and I could get a basic idea, I did not get any info, even after asking for it...strange!
It doesnt take much to make the LS3 heads flow well..Was this a stage 1 type CNC job or was it supposed to be an all out CNC job?? What flow numbers did they say they could get out of them with their CNC work??
From what was agreed and what I was invoiced for, was a complete CNC port job, In/Ex/CC, as for the flow #s like I said he would not give me any, he sent me a CAD flow profile in a email stating this is what his L92/LS3 heads flowed for example, he claimed...In 349.4 @ 28"H20 4.030 bore, at .600 lift Ex 217.5, we will see I had to leave the shop but they are going to flow them, in the exact state he claims the #s Those actually are nothing all that great considering Richard at WCCH flowed a stock set and got 328 In and 214 Ex @ .600. I am considering putting them on the shelf, and trying to get ahold of TEA or WCCH. Im not Happy at this point
I've have read many times that flow numbers alone don't necessary dictate how a head will perform. If I'm correct in who I think ported the heads, I have seen nothing but stellar results from them. My friend sent his heads to TEA and he has reported the same lack of communication from them as you stated. I find it very bizzare in this economy when someone is willing to provide you with business and you can't return the call.
If all they can do is send you a CAD photo and not give you some real world numbers maybe you shouldn't have went with them. I was already dealing with TSP for my rotating assembly and so I sent them my heads and had them back in a week and a half. Ported and spring change. Cost me a grand to get them done. They already had flow #'s on their site and a few people are already running their l92's with great success so it was a no brainer.