# Holley 750 CFM Double pumper **URL:** \ **Category:** Classifieds\ **Created:** [July 6, 2012, 7:44pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414 "2012-07-06T19:44:03Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![robftw](https://avatars.discourse-cdn.com/v4/letter/r/6bbea6/32.png) [@robftw](https://forums.speedlife.net/u/robftw)\ **Post date:** [July 6, 2012, 7:44pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/1 "2012-07-06T19:44:03Z")
Because this: [ATTACH=CONFIG]21403[/ATTACH] ---
**Author:** ![speedped79](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/speedped79/32/7491_2.png) [@speedped79](https://forums.speedlife.net/u/speedped79)\ **Post date:** [July 6, 2012, 8:08pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/2 "2012-07-06T20:08:41Z")
did you check the timing? what carbs on the car right now? ---
**Author:** ![robftw](https://avatars.discourse-cdn.com/v4/letter/r/6bbea6/32.png) [@robftw](https://forums.speedlife.net/u/robftw)\ **Post date:** [July 6, 2012, 8:18pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/3 "2012-07-06T20:18:55Z")
600 cfm timing is 36\* at 3500 rpm ---
**Author:** ![Jon](https://avatars.discourse-cdn.com/v4/letter/j/3bc359/32.png) [@Jon](https://forums.speedlife.net/u/Jon)\ **Post date:** [July 6, 2012, 9:27pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/4 "2012-07-06T21:27:07Z")
I’m willing to bet that a 750 will be too much…past experiences and volumetric efficiency. ---
**Author:** ![speedped79](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/speedped79/32/7491_2.png) [@speedped79](https://forums.speedlife.net/u/speedped79)\ **Post date:** [July 7, 2012, 10:09am UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/5 "2012-07-07T10:09:49Z")
> [@Jon](#): > > I’m willing to bet that a 750 will be too much…past experiences and volumetric efficiency. thats what i was thinking, what kind of carb is on there now? what size motor what compression what gas r u running? ---
**Author:** ![95dime](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/95dime/32/7514_2.png) [@95dime](https://forums.speedlife.net/u/95dime)\ **Post date:** [July 7, 2012, 8:56pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/6 "2012-07-07T20:56:24Z")
750 is way too much for your car. back off the timing. were those plugs in there when you were running the car for a few weeks without setting the timing? ---
**Author:** ![robftw](https://avatars.discourse-cdn.com/v4/letter/r/6bbea6/32.png) [@robftw](https://forums.speedlife.net/u/robftw)\ **Post date:** [July 8, 2012, 7:47pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/7 "2012-07-08T19:47:27Z")
> [@95dime](#): > > 750 is way too much for your car. > > back off the timing. were those plugs in there when you were running the car for a few weeks without setting the timing? Yeah for a little bit, but i changed them out once i got it timed. I retarded the timing a bit (without a light) and the cars running better on those fucked plugs. I will swap them when i get a timing light on it again. I still need a second set of new plugs for when choda gets his hands on it. I had to order them. edit: i want a 750 DP anyway because i will be stroking it out over winter time, and investing in nitrous oxide shortly. If we can make the 600 thats on it work thats great, but i still want to give the 750 a try. I’d rather run it rich than lean ---
**Author:** ![speedped79](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/speedped79/32/7491_2.png) [@speedped79](https://forums.speedlife.net/u/speedped79)\ **Post date:** [July 8, 2012, 7:54pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/8 "2012-07-08T19:54:54Z")
what size motor? i have a mild 350 with vortec heads and a vacuum secondary holly 650 and its pretty close unless you have a big block or really done up stroker small block i wouldnt go any bigger than 650 ---
**Author:** ![Copper280z](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/copper280z/32/5464_2.png) [@Copper280z](https://forums.speedlife.net/u/Copper280z)\ **Post date:** [July 8, 2012, 8:02pm UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/9 "2012-07-08T20:02:07Z")
> [@robftw](#): > > Yeah for a little bit, but i changed them out once i got it timed. I retarded the timing a bit (without a light) and the cars running better on those fucked plugs. I will swap them when i get a timing light on it again. I still need a second set of new plugs for when choda gets his hands on it. I had to order them. > > edit: i want a 750 DP anyway because i will be stroking it out over winter time, and investing in nitrous oxide shortly. If we can make the 600 thats on it work thats great, but i still want to give the 750 a try. **I’d rather run it rich than lean** Carb CFM doesn’t have anything to do with rich/lean, that’s all in the jets. ---
**Author:** ![Choda](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/choda/32/7347_2.png) [@Choda](https://forums.speedlife.net/u/Choda)\ **Post date:** [July 9, 2012, 8:09am UTC](https://forums.speedlife.net/t/holley-750-cfm-double-pumper/224414/10 "2012-07-09T08:09:31Z")
Robert!!! I said 650!!! Damnit!!! Get a 650!!!