340 intake and carb help

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superdart426

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Guys need some help on choosing an intake and carb for my 69 340 swinger the motor is .060 over kb 243 pistons,mp cam 450-455 lift,4 speed and a 3.55 posi tti headers 3 in exhaust eventually i will put on my str-12 but i need a combo for now to get her goin for summer and out of storage ur help is appreciated
 
superdart340 said:
Guys need some help on choosing an intake and carb for my 69 340 swinger the motor is .060 over kb 243 pistons,mp cam 450-455 lift,4 speed and a 3.55 posi tti headers 3 in exhaust eventually i will put on my str-12 but i need a combo for now to get her goin for summer and out of storage ur help is appreciated
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Can you list the tire size, specs of the cam and tell me your compression ratio.

Like the pigeons in "Bolt"

"U'm unfamilur with dat cam."

Otherwise, rrvolare's reply is good. A LD340 and a 650, I'm not to sure a 750 will be so happy ontop of a 3.55 geared car. If you cn tune a carb OK, it'll work fine.
 
tire size P 215 70 14,compression 10.5
Summit Racing Part Number DCC-4452761

Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,500-5,800
Intake Duration at 050 inch Lift 228
Exhaust Duration at 050 inch Lift 231
Duration at 050 inch Lift 228 int./231 exh.
Advertised Intake Duration 268
Advertised Exhaust Duration 272
Advertised Duration 268 int./272 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.450 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.455 in.
Valve Lift with Factory Rocker Arm Ratio 0.450 int./0.455 exh. lift
Lobe Separation (degrees) 110
Intake Valve Lash 0.000 in.
Exhaust Valve Lash 0.000 in.
Computer-Controlled Compatible No
Lifters Included Yes
Lifter Style Hydraulic flat tappet
 
This requires a dual plane intake.
Carb size is your call between the 650 or a 750. I myself would use a 650.

I think your STR is a bit much for this combo.
 
RPM dual planes rock, air gap or not depending on hood/filter.

Get a demon carb, you only cry one time when you pay for it.

I've been down the road of power valves and leaky performers.

Demon or nothing, won't EVER buy anything else.

I'd say a 725 road demon if you can get one on ebay for under $400 is what you want.
 
I know where you can get a Weiand Stealth for $130 + shipping! ;)
Don't wanna spend too much if you're going to swap it out eventually anyway.
 
I missed the Vacuum secondary Double Pumper, that must be a new model.

Now with twin blowoff-power valves! :D
 
With a four speed ... Holley HP Series 750 Double Pumper.... its a $600 dollar carb but it will perform very well with the progressive secondaries and downleg boosters! With a DUAL plane intake.
 
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