Drilling 90mm tb for idle
04-22-2007, 07:42 PM
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Drilling 90mm tb for idle I have a 408 with a fairly large cam and I was told to drill my NW 90mm tb to get the idle better. Is this common or should I try to get it tuned better. Thanks for any help.
04-22-2007, 08:04 PM
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the hole on the NW is almost smaller than on the stocker, I'd drill if I were you.
I researched the same question a while ago and decided to drill.
Getting a 408 to idle ok without it would be tough I would think.
I researched the same question a while ago and decided to drill.
Getting a 408 to idle ok without it would be tough I would think.
04-23-2007, 12:50 AM
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Tune first, then drill. Often times the idle is liveable just through tuning (unless its fly-by-wire). Although if the hole is smaller than stock, it probably wouldn't hurt to enlarge it a little.
04-23-2007, 04:06 AM
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I cant find it now, but I strictly remember reading a post a few weeks ago saying not to drill tb's anymore
I would search a little more before deciding to drill a perfectly good tb
I would search a little more before deciding to drill a perfectly good tb
04-23-2007, 05:51 AM
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04-23-2007, 04:20 PM
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The way I see it is that if you drill for one cam setup and decide to go back to stock or lesser aggressive cam setup the hole you have drilled is now too big for the new setup, especially if all you have to do is follow the directions in the link that 8a8mfh has posted above, this is the post I remember reading previously.
04-24-2007, 09:37 PM
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I have a 408 as well with a 264/272 cam and I have the throttle screw all the way in and it barely idles. I was thinking about enlarging the hole as well.
04-25-2007, 09:02 AM
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Originally Posted by fil131
The way I see it is that if you drill for one cam setup and decide to go back to stock or lesser aggressive cam setup the hole you have drilled is now too big for the new setup, especially if all you have to do is follow the directions in the link that 8a8mfh has posted above, this is the post I remember reading previously.
The only downside is that there are limitations as to how much you can compensate for, which is why I mentioned to tune first, then drill (if needed). 
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