750 Holley

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'73red-duster

'73red-duster

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I've found a new 750 Holley (vac secondary) for $200. I'm needing a carb for my 340. Mopar purple shaft cam (not sure of specs) J heads, stock bottom end. Also not sure on what intake to buy yet. Open for suggestions. My question,is that too much carb? :scratch:
 
no, not at all..a stock TQ back in the day was like 800-850 i think on a 340.
 
Assuming its a model 3310 - add RPM performer intake - makes a good combination on a 340.
 
Thats' about the ideal size Holley for your engine size. Regarding the intake choice, really can't go wrong with any of the dual plane manifolds currently on the market (Air gap, Performer RPM, etc.).
 
388dart said:
Assuming its a model 3310 - add RPM performer intake - makes a good combination on a 340.
Click to expand...

i got the same intake setup and it runs awesome
floridajulytoaugust2054.jpg
 
A 750 Holley isn't too big for a 340. Remember the TQ was rated higher than that. Also the factory also offered the 6-pak set up which was more than either of the previous carbs. They key is controlling the timing and opening rate of the secondaries........
 
:thumbup: Thanks for the advice guy's. 750 and perf. RPM is how I'll go. Please bear with me. It's been 30 years since I put a motor together,and I sure am remembering alot of things I have forgotten. :scratch: Plenty more ?'s coming,once I tear into this thing,I'm sure. Have a cold one on me :drinkers:
 
OK,called to make arrangements to pick up this carb. Found out it is a 750 DP,man.choke,mech secondaries. I know this is a higher $ piece,and probably better for race purp.,but how would it perform on the street as just a driver? Been a long time,but back in the day,seems like the few guys I knew that run these,were constantly having to adjust and tune them. Advice,please. Thanks,Dave
 
It will work ok still. Harder to tune and would be better if your running some gear like 3.91s. I ran a 650dp for years though with a LD340 inatke and 3.23 gears.
 
DP'er carbs can do well in the street. You'll just need to watch how hard you hit the hammer.
An ideal set up is a manual trans and higher numeric gears like 3.91 for the carb to shine well.
Otherwise, if it's on a auto trans and 3.23's or numericaly lower gear, it will be harder to get the car going in a hurry.
Years back I had a 600 DP on a 318 backed by a 4spd and 3.23's. (Small tire) It took some tuning to get the car to accept a mashing of the pedal, but I got there. VEry nice when you get it all worked out.
You'll like the RPM and Holley DP combo.
 
:thumbup: Thanks Adam & Rumble. Car is '73 Duster 4-speed / .321's. Engine is 340 from a '72. (Low comp.) Think I'll steer clear of the DP. I'm not concerned about how fast she'll go,just want her to look,run,and sound good,with as little problems as possible. I don't want to go any lower in the gears,so when I take a Sunday drive to my Dad's (125 miles each way),I can pass at least a few of the gas stations. Will go with the Perf. RPM and probably a reg. 750 Holley,unless you have better suggestion for good working,easy tuning carb. Thanks again,Dave
Have a cup on me :coffee2:
 
Actually the best carb I ever ran on my low compression 340 was a Eddy 600. Great throttle response and milage. It may have had more top end with a 750 though.
 
Actually the best carb I ever ran on my low compression 340 was a Eddy 600. Great throttle response and milage. It may have had more top end with a 750 though.

Adam,is that not pretty much the same as a Carter AFB? That is what is on my Sport /360,and performs great. I had good luck with AFB's back in the day,just never had much exp. with Holley's. I'm 53,and a Grandpa, not speaking for anyone else in this catagory,but top end,is no longer a concern. I got my 150+ mph fix,many years ago. :headbang: Thanks again,Dave
 
Yes its the same as the AFBs. The new AVS are said to be a little better too.
 
get yourself a Holley 670 street Avengerand a gasket, bolt them on the RPM manifold and go - and enjoy - I did. Its a great carb for a low compression 340.
 
AdamR said:
Yes its the same as the AFBs. The new AVS are said to be a little better too.
Click to expand...

i have a AVS the only big diference betwen a AFB or edelbrock performer carb and a edelbrock AVS carb is that it is alot easier to tune the vacum secondary you only need a screewdriver and a torxscrewdriver to tune it in exept for that it is about the same as the earlier mentioned carbs!
 
edelbrock,, bought carter,, carter made the afb,,,also the avs,,

avs stands for air valve secondary,works like a thermoquad or just like a holley vacumn secondary,,

if you have the change and are not concerened in haveing as much top end as possible ,ide get the edelbrock avs,,im not sure what cfm the avs is available in,,but stay under 750,for a mild or stock street cruiser ,,that wants some gas mileage,, the smaller the cfm,,the crisper the throttle responce will be the bigger the more top end,,and less mileage you will get,,,
im not saying the edelbrock doesnt make power ,,but they are factory tunded for mileage,,but can be worked to make power,,,holley;s usually make more power out of the box,also geta an electric choke,,,,,
 
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