April: 355 with Edelbrock 600 - 13.36@99mph
June : 355 with Edelbrock 750 - 13.49@104mph (just changed carb)
Sept : 355 with Holley Red - 13.29@103mph (just installed fuel pump to replace junk mechanical one)
Nov : 355 with Holley 750 DP - 13.23@104mph (today was terrible weather and yet I still had the best mph and ET all year)

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'90 GTA...nitrous is your friend

 

Where's Jester? You'd think he'd be in here with his usual comments about Edelbrock carbs. Though, I guess there really isn't anything to say...

 

Yep these numbers are about what my results were.
One thing though, what were your 60's at with the 600 edelbrock and the holleys?
I had a tenth better 60 footers with the 600 edelbrock than the 600 cfm holley or the 670 SA.
SSC

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85 Camaro, 355/400 "drag car" current DD 13.1@ 101mph on its last season run.
Plans: Possibly add N20 for next season.
82 Firebird, 355/350, as soon as the powertrax gets installed. "dyno time"

 

Exactly :shrug:

Thaks for the results crazeinc. It's always good to see more personal results, even supporting such already widely held truths

I'm actually a little surprised tho the difference wasn't greater. 6/10 is certainly substantial, but I bet there might be more in it. I bet if you play with it a little and try again with better weather, a full second gain is doable.


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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

Guy here, part owner of a muscle car resto/performance shop, showed similar improvements going from Holleys to Demons on 4 different cars/engines; using G-tech for comparisons in the cars, and engine dyno in one case.

Except all Demon replacements were the same type (double pumper or vac sec) and CFM rating as the Holley it replaced, as well as all of the Demons were out-of-the-box vs. tuned-to-the-max Holleys (and he knows how to tune a Holley).

Typical improvement on 396-454 BBC's was over 25 HP. A '67 427 4-speed Vette had so much more low-end torque they had trouble hooking it up with the Demon off-idle while they launched the Holley at 1500 rpm, but 60-foot, 1/4 times and speed still improved.

I think I got the wrong carb for the '57...

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

my results with carbs:...they suck!!!!!end of story

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89 firebird formula


360 10:1compression (350 .060 over)/fully balnced and blueprinted
comp cams xe262 cam
performer rpm intake/port matched to heads
#1405edlebrock 600
sportsman 2 heads 64cc 2.02/1.60 valves 200cc intake runner/cnc pocket ported
msd 6al/msd8.5 super condutor wires
h.e.i. proform 50,000 volt vac. advance ditributor
700r-4 with 3.08 first gear and 3.73 7 5/8 rear end.
b trans shift kit(will kill shifts...suck dong!!)
shorty heddman hedders with custom 3" pipe y-pipe back(no damn cat!) with 40 series flowmaster!
griffin daul1" core rad.cutom fabrication to fit(but no cutting )


future mods: 406 roller REALLY REALLY REALLY RADICAL!!!!!.with lots of NOS

 

HMMMMMMMMMMMMMMMMMMMMMM.........