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Yeah, I wouldn't think the SD would be causing the problem given the rave reviews it gets. Maybe it just works better on hotter engines rather than my relatively stock combo. Anybody ever use a SD on a stockish engine and have low end issues? I agree that changing carbs to a known good one regardless of the brand could elimiate a lot of guess work. I'll have to beat the bushes to see if I can scare a good candidate up.


Not a 440, but a 383.
~8:1, 268H cam, basically a stock rebuild smog engine with headers and a holley 750dp
4000lbs Fury, 275/60/15's
SD intake and 3.91's from an idle would barely chirp the tires
stock iron 4bbl intake and 3.23's from an idle I'd get a little spin

To be fair, I did not try to optimize timing for each intake, but for the gear change in the opposite direction I thought it a pretty substantial loss in tq with the holley intake. The big 383 intake comparo HotRod did confirms this. How that translates to a 440 is a bit up in the air however.

Last edited by furious70; 09/18/09 04:47 PM.
70 Sport Fury
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69 Coronet
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