Guest Anonymous Posted August 21, 2002 Share Posted August 21, 2002 Right now I have a Holley 8007 390 cfm 4 bbl carb sitting atop my 6 with a very bad dead spot. I have already rebuilt the damn thing 2 times... what are my options, I really dont know much about carbs so I need help... What other choices to I have besides Holley. Right now I need a cheap fix because I plan on getting a 2.8 T BTW it is a 240.. Any and all help is needed.... Quote Link to comment Share on other sites More sharing options...
DCZ Posted August 21, 2002 Share Posted August 21, 2002 I think your best option is to get a set of SUs and put them on. I had a holley 4bbl many years ago and knew nothing about carbs so I traded a guy some parts and he put SUs on mine. Much better and once I got the ZTherapy video I was able to tune/rebuild them myself. Keep an eye out on the buy/sell forum here, at zcar.com and 240z.org, etc, even eBay and you should be able to get a setup for $100 to $250. As long as the throttle shafts aren't worn out (vacuum leaks) they can be rebuilt for cheap. Good Luck! Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted August 22, 2002 Share Posted August 22, 2002 I changed over my 260Z to a Holley 390 this past year and it also had a "flat spot" in the throttle. Keep in mind this is a universal carb and it needs to be tuned for your motor. Going from the 6.5 to a 8.5 power valve fixed the problem for me (means it starts pumping in extra fuel at a higher manifold vacuum level - manifold vacuum is high at idle/cruising and drops when you give it throttle). I drove the car around with a vacuum gauge hooked up to figure out what vacuum level I needed more fuel at. Best advice is thoughly read the Holley tuning instructions and maybe buy a book on the subject too. Good luck! Quote Link to comment Share on other sites More sharing options...
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