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340/Holley Question
#744181
07/09/10 04:42 PM
07/09/10 04:42 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
OP
super stock
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OP
super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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I have a 70 340 with stock J heads, stock 340 hi po manifolds, stock compression, stock cam, stock 4bbl manifold in my 69 Formula S Cuda. I have a box stock Holley 1850S (600 cfm) on top, with 67 primary jets.
The gears are 3.23s. Is the secondary jetting too lean and requires addition of a jet plate, or do you think that this is sufficient for the motor?
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: 340/Holley Question
[Re: MoparJ]
#744182
07/09/10 06:36 PM
07/09/10 06:36 PM
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Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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a 600 CFM is just to small period.... get a 750... mine runs great on 1250 CFM....
I am truckless..
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Re: 340/Holley Question
[Re: 340SHORTY]
#744183
07/09/10 07:01 PM
07/09/10 07:01 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
OP
super stock
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OP
super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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To me, 750 seems too large for a 3.23 geared stock internal motor. Maybe a 650 Avenger or Edelbrock.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: 340/Holley Question
[Re: MoparJ]
#744184
07/09/10 07:09 PM
07/09/10 07:09 PM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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if it is just a daily driver...a 600 holley will be fine...especially with 3.23 gears..
if the car has more gearing, converter and cam...yes a 750 holley is faster...
besides you have it already....
Last edited by 70AARcuda; 07/09/10 09:44 PM.
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: 340/Holley Question
[Re: MoparJ]
#744185
07/09/10 09:35 PM
07/09/10 09:35 PM
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Joined: Jan 2003
Posts: 5,444
Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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I had a Holley 600 that was modded to a 650 by Promax. When my motor had about the same specs as yours, I ran 68-70 front jets and 74-76 rear jets.
What I found was the secondary metering plate sure made it easy to dial in the WOT.
I am not sure that you will know until you try it and play with the secondary jetting. If you do not have any pinging at WOT, then it may only help a little.
I know from experience that a stockish 340 with the HP manifolds ran very well with the 650 vac/second carb with 3.55's and 26" tires. The Edy 600 that I had was not as responsive with this combo. I think that your 600 would be fine for a stock 340 for cruising but as soon as you want some more performance, then stepping up on the converter will be a big difference in performance.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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