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PostPosted: Sun Jun 10, 2018 1:41 pm 
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Quick Tech question. On my 408 C build, Scat stroker kit, 10.5:1 static compression, custom built Lykins Motorsports CHI 4V alum heads, Lykins spec' 650+ lift solid roller cam, Holley Strip dominator and Hooker long tubes with 1 7/8 tubes.
Question: what CFM carb should I be looking at for street / maybe strip occasionally.
Also 3:89 rear gear, estimated 3500# car. 850? 950?


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PostPosted: Mon Jun 11, 2018 12:58 pm 
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Something like a 950HP would be good but I've also done a few 408's with a 740 which is a custom built piece that uses a 650HP body and that works like gang busters in that type of application.


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PostPosted: Mon Jun 11, 2018 2:39 pm 
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I wouldn't go under an 850. If you're not concerned about appearance, a Quick Fuel Q-850 would be my first choice.

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PostPosted: Mon Jul 02, 2018 12:31 pm 
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I vote with Dave, or at least a well prepped "750 DP" which usually runs in the 800+ range after they get done with them.

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PostPosted: Mon Jul 02, 2018 2:46 pm 
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My vote is for a 950cfm. I switched from a 825cfm Demon to a 975cfm Demon on my 408 last weekend and picked up .11 of a second in the quarter mile. That was back to back passes with no weather change.


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PostPosted: Mon Jul 02, 2018 6:58 pm 
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johncroft wrote:
My vote is for a 950cfm. I switched from a 825cfm Demon to a 975cfm Demon on my 408 last weekend and picked up .11 of a second in the quarter mile. That was back to back passes with no weather change.


Don't forget that this is a street/strip build so off idle, part throttle driveability and throttle response are very important.


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PostPosted: Mon Jul 02, 2018 8:47 pm 
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Location: Texas
How much power you looking to get or think it will have? My off the shelf Barry Grant 750 Mighty Demon "pre Holley" seems to do nice on my 359C. It made 520hp at 6300rpm 450tq at 5600rpm on engine dyno. I have though been wondering if it would like another 100 c.f.m
My carb with the Trick Flow 225cc heads, the matching intake and custom solid flat cam from Bullit Cams has no off idle or part throttle issues - when it's at least 150º :D


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PostPosted: Tue Jul 03, 2018 7:12 pm 
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nova467spanker wrote:
How much power you looking to get or think it will have? My off the shelf Barry Grant 750 Mighty Demon "pre Holley" seems to do nice on my 359C. It made 520hp at 6300rpm 450tq at 5600rpm on engine dyno. I have though been wondering if it would like another 100 c.f.m
My carb with the Trick Flow 225cc heads, the matching intake and custom solid flat cam from Bullit Cams has no off idle or part throttle issues - when it's at least 150º :D


You have to remember that fuel curve trumps airflow when it comes to carburetors and it takes a pretty large change in cfm to make any real difference in power.


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PostPosted: Wed Jul 04, 2018 6:21 am 
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An out of box 950HP only flows about 830 cfm. That being said, they generally work really well and have nice off idle manners and just plain work. On my better half's 408W at the track, an old 850DP is a touch quicker than a 950HP. But, if it were a street/strip deal, I would run the 950 every day of the week just because of it being the better "driving" carb.

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