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Re: got a 340 intake for my 318 RR...what next?
[Re: Mopar_Country]
#886592
12/24/10 01:18 PM
12/24/10 01:18 PM
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Joined: Jan 2009
Posts: 124
Pittsburgh, PA
bigdaddywiz
OP
member
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OP
member
Joined: Jan 2009
Posts: 124
Pittsburgh, PA
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thank you so much for all the tips! i will check and see exactly what kind of carb i have when i get home. should i look for any specific markings?
73 Road Runner
09 Challenger R/T
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Re: got a 340 intake for my 318 RR...what next?
[Re: bigdaddywiz]
#886593
12/24/10 01:40 PM
12/24/10 01:40 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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cant miss a thermobog,,it has a plastic bowl center section  and is preety big looking AFB will look like and edelbroke carb..maybe not as pretty  Q-jet looks like ...well a q-jet  I like running a q-jet on all my 318s myself and mopar did use them..so you can find one with a mopar throttle lever too
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Re: got a 340 intake for my 318 RR...what next?
[Re: MoparforLife]
#886598
12/24/10 02:36 PM
12/24/10 02:36 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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 at least a good soaking and rebuild kit move the carb and lets have a look at the intake is it a spredbore intake? is that holley a spredbore carb? what are the list #s on the airhorn/front driverside? if not a spredbore did it have a square to spredbore adaptor? 
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Re: got a 340 intake for my 318 RR...what next?
[Re: scratchnfotraction]
#886600
12/24/10 02:40 PM
12/24/10 02:40 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
at least a good soaking and rebuild kit
move the carb and lets have a look at the intake
is it a spredbore intake?
is that holley a spredbore carb?
what are the list #s on the airhorn/front driverside?
if not a spredbore did it have a square to spredbore adaptor?
That is a speadbore Holley.. Mechanical secondaries = 4 mpg... Find a Thermoquad or a Mopar OE Quadrajet.. 
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Re: got a 340 intake for my 318 RR...what next?
[Re: bigdaddywiz]
#886603
12/24/10 10:48 PM
12/24/10 10:48 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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no you dont have to change traz or rear axle
they will take a little HP upgrade
run them till they break then swap to bigger stuff
comp 901-16 springs are good for most cams that are a mild hydro cam,they are a single with damper,drop on with heads on engine,use stock valve seals and retainers
I steped mine up to a small roller cam with the 901s and run the 904 tranz with a high stall loc-up verter
Last edited by scratchnfotraction; 12/24/10 10:51 PM.
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Re: got a 340 intake for my 318 RR...what next?
[Re: bigdaddywiz]
#886604
12/24/10 10:56 PM
12/24/10 10:56 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
Quote:
If you can swing an intake change, can you swing a little more for a cam change? The summit k6901 cam/lifter kit is only 110 bucks and I'm sure someone on here can suggest a set of valve springs. Add in a set of aftermarket headsers and you'll really wake that 318 up a lot more than just doing the intake.
i'd love to do that down the road, but wouldnt i have to change out the 904 tranny and 8.25 rear to handle the extra power? how far can i go?
You're not making that much power for it to be an issue. Also one thing you should really look into is what rear end gear ratio you have. 2bbl 318's tended to come with granny rear end gear ratios. Gears like that make for nice highway cruising but will make your car an absoloute DOG in the acceleration department.
Quote:
Quote:
If you can swing an intake change, can you swing a little more for a cam change? The summit k6901 cam/lifter kit is only 110 bucks and I'm sure someone on here can suggest a set of valve springs. Add in a set of aftermarket headsers and you'll really wake that 318 up a lot more than just doing the intake.
I have run this cam on two different 318's with stock springs with no problems up to 5500 rpm. My 76 Feather Duster with this cam, a 72 340 TQ and duel exhaust was a screamer! The 4-speed and 3.55 gears helped too!
That's very interesting. If the stock springs will do it to 5500, assuming they're in good shape, that sounds like a good bet. Stock 318 heads are going to be done by 5500 anyway.
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Re: got a 340 intake for my 318 RR...what next?
[Re: bigdaddywiz]
#886606
12/24/10 11:12 PM
12/24/10 11:12 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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2.76,2.94,3.21,3.23.3.55,3.91 depends on what was orderd when new most have a 2.76 open diff 3.55 are good for the street 3.91 are better but can get old on the highway pull the rear cover and change the oil,probly needs it anyways..while its draining turn it to see the yr and gear ratio stamped on the ring gear few bucks for 2 bottles of gear oil,that info is cheap and will be needed down the road with upgrades...also will know if its open or a sg unit a short dur cam with high lift works great in a teen for street duty..gears multiply the torque and HP so the lower the better for launching it from stand still 
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Re: got a 340 intake for my 318 RR...what next?
[Re: bigdaddywiz]
#886610
12/25/10 01:25 AM
12/25/10 01:25 AM
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Joined: Nov 2006
Posts: 1,459
oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,459
oklahoma
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Quote:
Quote:
2.76,2.94,3.21,3.23.3.55,3.91 depends on what was orderd when new
too bad my dad doesn't remember...he's the original owner! i always get on him for getting the "base" model...he sold a 1970 340 duster for a 318 road runner! i've attached a pic in case you were interested. 
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