Street driven
4 speed cuda 3:55 rear gear
Close to 600 lift solid roller
10:4-1 comp
Max rpm 6200
Holley says single 670cfm is that anough?
No, not enough for that engine. What intake manifold? I would suggest something like a Holley 950 HP for that car. It will use every bit of that - and then some.
It has been said CID of the engine X 2=carb size. :alan2cents:
Mopar Performance recommended 850cfm Holley Double Pumpers on their 472" and 528" crate motors, and 750cfm on their 426" crates. Their 528" had 10.25:1 compression, dual-plane M1 intake, hydraulic lifters with .524/.543" lift.
- Wade
Single plane iintake or dual plane? Stock 426 Hemis ran dual 650's and didn't bog. I think those 950's flow less than an 850. I'd be tempted to run a 1050 Dominator for a single 4 application. I have run Hemis for decades and not once did I think "dang I wish I had smaller carbs".
Hemis move a lot of air , I would use a 950 CFM Proform as the smallest carb choice
1050 Dominator is an awesome carb & I woule thinking about that for sure .
950 cfm if single 4 bbl. 2x600 cfm if dual carbs.
Again, what intake are you running? If it's the MP dual plane it might be best to put it up for sale before investing in a carb for it.
Quote from: RUNCHARGER on September 10, 2020, 06:57:19 AM
Again, what intake are you running? If it's the MP dual plane it might be best to put it up for sale before investing in a carb for it.
I wonder if hood clearance is an issue? :thinking:
The stock aluminium dualplane it came with from mopar performance... it has a 4150 street hp 850 dp on it ...
It has a issue ! when cruising its 13.7 afr when accelerating alittle hard it leans it out ,unless i floor it and it overcomes the lean spot and the sec kicks in...
The acc pump cam / nozzles has been switched back and forth but nothing is changed...
Has a 5,5 power valve in it
Simple thing but is the pump arm adjusted ok? :notsure:
Yes its not a off idle stumble... wich a miss adjusted pump does
???
So what is the intake vacuum idling , in gear if Auto , the power valve should be at least 1.5 " below that reading , What about the secondary accel pump what size pump shooter & cam . as the secondaries are quickly opened it can go lean if there is not enough pump shot , you might need a 50 cc pump / if you are near .040 shooter you might need a hollow screw , I would want a pump cam that delivers a lot of fuel fast not a long duration shot , do you have enough jet size in the rear so when the pump shot is done you still have adequate fuel through the boosters ?
30cc acc pumps
31 nozzles
orange pump cams in no 2 position
9hg at idle
7 power valve
78 front jet
88 rear jets
13.1 wot afr
13.8 cruise afr