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Discussion Starter · #1 ·
Here's what I have:

SLP single
Indyhead heads
V force reeds
ported carb boots
Flow rites and slp air horn
Tempa flow

I just dropped to 440 main jets cause the 460's where way to rich (sea level)
but am wondering where to put the needles. Or leave them in the stock location
 

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leave the needles in the stock location, MAYBE raise the clip a notchand add a shim (half a notch so to speak) to lean it... i wouldn't do any more than that... i have a similar setup and my needles are stock...
 

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I am running about the same thing except a RTK head and a gutted box.

most of the time last season was spent over 1000~1500' above but below 4500' sealevel in NH... I was thinking of going to 430 mains and still leaving the needle in the stock clip unshimed. I think if your doing a lot of high speed runs maybe leave the 440's and drop the needle .010" to start . see what your wash looks like from there.

SLP single pipe didnt start to make power until I jetted under 450 mains! seams good at 440's thats as lean as I had it last season, just cranked the tempaflow 1/4 turn lean from there.
 

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I ran your setup except for stock head @ sea level in very cold temps all last year.

420's ran well, good wash and plugs and very good performance.
If you like to clamp it for miles at a time and or lot's of high speed trail running I would stay @ 430.
The gutted box really pulls fuel allowing the leaner mains.
 
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