Originally posted by AirKnight:
Originally posted by Big Jim:
If you port and polish the SE heads you should be able to pretty much replicate the extrude honed SVT heads.
No, you can't replicate the extrude hone process with port and polish. Hand porting the intake passages with curves is not going to be as good as extrude honing it.
Not true. The main reason for extrude honing is the ease and speed at which the gains can be replicated from piece to piece. The next reason EH would be used over hand P&P is being able to reach intricate details inside impossible to reach ports, such as the UIM on a 2.5 Duratec. Outside of that, one has no gain over the other. The air doesn't care how the material was removed as long as the right material was taken from the correct spots. That's where an experienced P&P'er comes into play with flow numbers to back up their data. BTW, hand P&P numbers can surpass EH numbers and vice-versa depending on how much work has been done.
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