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#1
02-25-2011, 06:22 PM
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455 Carb CFM reccomendations
I am going to be upgrading my carb and intake. Currently I have the following:
455 (60 over) Forged flat top pistons, tomohawk forged rods, stock crank 6x8 heads mildly ported, crower springs Performer Intake, and Edl 650 Carb(left over from the the 350) Crower 60210 Cam I am thinking performer rpm intake and a holley street avenger 770. WOuld that be enough carb? The motor is basically just built, so there wont be any major changes in the near future. It is in a 1974 firebird, with the stock t350 and rear. Thanks Vic |
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#2
02-25-2011, 06:25 PM
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Vic, how are you going to deal with hood clearance between the Firebird hood and RPM intake?
The carb is probably marginal at 770, FWIW.
__________________
 ___________________________________ "Objects in mirror are closer than they appear" 
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#3
02-25-2011, 07:23 PM
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I agree with Overkill. It will run decent with the 770 but, will run better with a 800 or 850, or the HP950 or even the HP1000 which is just a fancy 850.
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#4
02-25-2011, 09:37 PM
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thanks for the info. I will prob go with an 850 or street avenger 870 the. I am pretty sure I will have the needed hood clearance because I have a 3 inch cowel induction hood, but my 'bird DOES NOT look like a camaro...
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#5
02-25-2011, 10:51 PM
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An 850 would work great on a 455 ! I replaced my 750 with a 850 and picked up a tenth on a mild 455 in my 79 trans am.
Gene
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Gene Kinch 1969 firebird CVMS 468,t-400,9inch 3.50 rear 11.58@116 1979 TA 462,t-400 3.23 10 bolt 12.76 @ 108 1971 GTO 400,t400 3.23 10 bolt all original 14.41@96 1968 GTO Gallop-n-Goat race car CVMS 462,pg 4.56 12 bolt eheads 5.98 @115 on e85 1995 Jerry bickel ex-pro stock Firebird,sonny leonard 632,Glide,9 inch 4.10 rear 7.08 @198 ( crashed and under reconstuction) 1979 TA, 400/ 4 speed all original needs restoration. 1999 Trans Am LS1 |
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#6
02-25-2011, 10:56 PM
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I have a real nice 850DP in the for sale section, it was briefly (break in) on a motor similar to yours.
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 Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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