What do you think of the portwork on these heads?
#22
10 Second Club
iTrader: (8)
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CNC has two key advantages accuracy/repeatability and freeing up the operator to do something else while the machine runs.
If you have to stand there and babysit because the port was already hacked up then you lose one of those advantages and should charge MORE to do it. With stock castings being so readily available the smart thing to do would be to just get a virgin set of castings. Besides, they could already have had meterial removed where a porter wants it left.
I run a wood CNC, not exactly the same as metal but still gives me a good idea of what CNC is and is not good for.
If you have to stand there and babysit because the port was already hacked up then you lose one of those advantages and should charge MORE to do it. With stock castings being so readily available the smart thing to do would be to just get a virgin set of castings. Besides, they could already have had meterial removed where a porter wants it left.
I run a wood CNC, not exactly the same as metal but still gives me a good idea of what CNC is and is not good for.
CNC is great for consistant reproduction. BUT most CNC machines do need to have an operator stand by at the start of operations to get the machine homed in on the right position and operating within your tolerance, Tool wear, temperature, and how long the machine has ran has an affect on these. Especially older machines.
Anyhow that is beside the point. I have seen these heads in person, to me the bowl area has only been polished, and the start of the intake runner has been flubbed up, but is still saveable.
Honestly matt I would just go ahead and switch valve springs from your other set of heads on to these and run these since they are true, and send off your other set eventually for porting since they have only been touched an inch or so into the runner.
#28
TECH Apprentice
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So true. A flowbench along with a dyno are nothing more than a measuring stick. Just because a head flowed good on the bench doesnt mean its worthy of big power. Its not uncommen to gain 10 CFM on the bench and lose 15 HP on the dyno. The numbers gathered from a flowbench arent the only thing needed to make a great flowing set of heads. A good head porter also uses their ears to tell whats going on in the port while on the flowbench. It not all about quantity of airflow, the quality of airflow is just as important.
#29
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