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Carb for a 408 #1511171 10/02/13 12:03 AM 10/02/13 12:03 AM
Joined: Aug 2006 Posts: 85 Iowa R Rodder OP member
Rodder OP member R Joined: Aug 2006 Posts: 85 Iowa	Could I hear from you guys with 408 small blocks running a 850 double pumper, what jets sizes work best so it doesn't fowl the plugs and do you use two power valves or one, or none? Thanks

Re: Carb for a 408 [Re: Rodder] #1511172 10/02/13 12:44 AM 10/02/13 12:44 AM
Joined: Jan 2007 Posts: 8,041 Mt Morris Michigan mopar dave master
mopar dave master Joined: Jan 2007 Posts: 8,041 Mt Morris Michigan	Bigs 950 stage5+ which uses a proform 850 main body with 1.450 venture. 75/83 1 power valve in the front. Last edited by mopar dave; 10/02/13 01:30 AM. http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: Carb for a 408 [Re: mopar dave] #1511173 10/02/13 01:08 AM 10/02/13 01:08 AM
Joined: Jan 2003 Posts: 1,365 elmira ny hp340nos pro stock
hp340nos pro stock Joined: Jan 2003 Posts: 1,365 elmira ny	i use an aed 850 on my 418 stroker,pump gas.bought through competition wedge racing(todd).it has 79/88 jets,4.5 pv on the primary side,squirters are 37/40,works real well.mike

Re: Carb for a 408 [Re: Rodder] #1511174 10/02/13 05:36 AM 10/02/13 05:36 AM
Joined: Oct 2003 Posts: 614 ont,canada M mopartuner mopar
mopartuner mopar M Joined: Oct 2003 Posts: 614 ont,canada	Quote: Could I hear from you guys with 408 small blocks running a 850 double pumper, what jets sizes work best so it doesn't fowl the plugs and do you use two power valves or one, or none? Thanks I have recently learned that jet sizes depend alot on what carb you run as well as the specs of the motor.I bought one of the new Holley 850 ultra hp carbsand had 88&95 jets and never did get rid of a large stumble.I took it back and got a 850 Q-series Quickfuel carb and had to jet it down and its close with 74&82 jets.No powervalve in the rear and the Quickfuel carb has no stumble and works verry well. 410 pump gas solis flat tappet cam 10.95 so far

Re: Carb for a 408 [Re: mopartuner] #1511175 10/02/13 08:34 AM 10/02/13 08:34 AM
Joined: Oct 2007 Posts: 3,978 Hilltown Pa 1967dartgt master
1967dartgt master Joined: Oct 2007 Posts: 3,978 Hilltown Pa	Holley 950 hp 84 square no power valve, on a 421 small block(4.095x4). Brett Miller W9 cnc'd heads STR Chassis fabraction

Re: Carb for a 408 [Re: 1967dartgt] #1511176 10/12/13 05:28 PM 10/12/13 05:28 PM
Joined: Jan 2003 Posts: 412 Hampton Va gtsdon mopar
gtsdon mopar Joined: Jan 2003 Posts: 412 Hampton Va	Pro Systems 850 running 76-86 jets.

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