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Best 340 cam/intake combo #940738 03/01/11 07:16 PM 03/01/11 07:16 PM
Joined: Jan 2009 Posts: 149 Rancho Cucamonga,Ca 3 392charger OP member
392charger OP member 3 Joined: Jan 2009 Posts: 149 Rancho Cucamonga,Ca	My son wants more power and a bigger cam in his 71 340 Demon. Currently has an old hyd 268 Magnum cam (180 lbs crankng compression)and a Crosswind (Professional Products?) intake. 99% street car with 727 auto, 355 gears, Dougs headers, manual brakes, mopar performance dist, 770 street avenger holley and a mild stall wich power brakes to around 2400. I told him to install the LD340 intake we already have but he wants to put a single plane on it along with a Mopar hyd 508(?) cam/lifter kit while retaining the stock rockers and springs. I'm not sure this would be the hot set and would need new springs at least, so I am asking for your proven combos. Thanks Moparts members

Re: Best 340 cam/intake combo [Re: 392charger] #940739 03/01/11 07:30 PM 03/01/11 07:30 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	I think he should listen to you

Re: Best 340 cam/intake combo [Re: 392charger] #940740 03/01/11 07:31 PM 03/01/11 07:31 PM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	Yep put the MP .509 with a single plane manifold an watch it turn into a slug. Not enough converter or gear ratio for that deal. If it's got a set of stock springs on it now you'd be best to upgrade them. The combo you have looks ok for mid to high 12's and should daily drive fine. What do the track numbers look like?

Re: Best 340 cam/intake combo [Re: 392charger] #940741 03/01/11 07:34 PM 03/01/11 07:34 PM
Joined: Jan 2003 Posts: 4,518 Indiana MonGoo$e master
MonGoo$e master Joined: Jan 2003 Posts: 4,518 Indiana	Same here for the LD340, thats a keeper My YouTube Channel, "Hoosier Garage" https://www.youtube.com/HoosierGarage

Re: Best 340 cam/intake combo [Re: MonGoo$e] #940742 03/01/11 08:55 PM 03/01/11 08:55 PM
Joined: Jan 2003 Posts: 9,875 Weddington, N.C. Streetwize master
Streetwize master Joined: Jan 2003 Posts: 9,875 Weddington, N.C.	Father knows best!! the old Ultradyne 223/231 on 108 in at 102 would be about as big as I'd go there and that'll work with the vert and gears, the LD 340 is a good one but if the crosswind is the airgap clone you won't tell a bit of difference between them Overcam and undergearing a short stroke motor is not a good idea, if it was a stick and 4.10's the 508 would work a good bit better but I'd step that up one notch of the ultradyne chart to the 231/239 which is my favorite hot street 340/360 cam. WIZE World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker! https://www.youtube.com/watch?v=-mWzLma3YGI In Car: https://www.youtube.com/watch?v=PjXcf95e6v0

Re: Best 340 cam/intake combo [Re: goldmember] #940743 03/01/11 08:56 PM 03/01/11 08:56 PM
Joined: Jan 2009 Posts: 149 Rancho Cucamonga,Ca 3 392charger OP member
392charger OP member 3 Joined: Jan 2009 Posts: 149 Rancho Cucamonga,Ca	He's never had it to the track but plans on doing so this summer. It used to be my car so I know it pretty well and my seat-o pants meter would guess it runs high/mid 13's. I agree that a 509 would be the wrong cam for this car. If he were to go up a notch or two what would be a good cam to go with the LD340 intake?

Re: Best 340 cam/intake combo [Re: 392charger] #940744 03/01/11 09:22 PM 03/01/11 09:22 PM
Joined: Jan 2003 Posts: 5,443 Indiana Y YO7_A66 master
YO7_A66 master Y Joined: Jan 2003 Posts: 5,443 Indiana	""a mild stall wich power brakes to around 2400."" Have you thought about a performance converter with the cam/intake swap? 1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)

Re: Best 340 cam/intake combo [Re: 392charger] #940745 03/01/11 09:25 PM 03/01/11 09:25 PM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	Call Tim @bullet cams and have him use H10 lobes on a 108-110 lsa. I use it on customers cars that want strong street 340-360's that pull from 2500-6500 rpm with mild valve springs(NO STOCK SPRING),120lbs seat-275-300lbs open. I've replaced a few .509 MP cams with this and the results are fantastic. The crosswind intake has worked well and I doubt the ld430 would be an improvement,but testing is the only way to be sure.

Re: Best 340 cam/intake combo [Re: 392charger] #940746 03/01/11 09:52 PM 03/01/11 09:52 PM
Joined: Dec 2008 Posts: 176 Rome, GA G GTXX member
GTXX member G Joined: Dec 2008 Posts: 176 Rome, GA	I have one of those .508 cams with maybe 100 miles on it, if interested PM me. A mechanic at local dealer had it in his Dart and decided it was too much for a daily driver.

Re: Best 340 cam/intake combo [Re: 392charger] #940747 03/02/11 02:15 AM 03/02/11 02:15 AM
Joined: Jan 2003 Posts: 1,996 s. e. pa. C calrobb2000 top fuel
calrobb2000 top fuel C Joined: Jan 2003 Posts: 1,996 s. e. pa.	hi without changing anything in engine a mopar 280 / 480 < old hemi grind > would be a nice upgrade for thay engine with the ld340 intake .

Re: Best 340 cam/intake combo [Re: calrobb2000] #940748 03/02/11 10:15 AM 03/02/11 10:15 AM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	cam, I'd used hughes #1110 springs and a lunati voodoo 60403. intake, I'd probably go to the LD converter, I'd go to something in the 2500RPM stall range. 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: Best 340 cam/intake combo [Re: 392charger] #940749 03/02/11 10:41 AM 03/02/11 10:41 AM
Joined: Aug 2007 Posts: 1,564 St. Clair Shores, Michigan bigsbigelow pro stock
bigsbigelow pro stock Joined: Aug 2007 Posts: 1,564 St. Clair Shores, Michigan	Before tearing into the engine, call a reputable torque converter company and see what they recommend for the combo. Ryan "Bigs" '73 Duster (BLKDUST) - Black, 100% factory sheet metal, flat hood, 346 cid, J Heads, and a bench seat. http://s268.photobucket.com/albums/jj1/bigsbigelow/ Best to date: 12.40 @ 109 mph

Re: Best 340 cam/intake combo [Re: patrick] #940750 03/02/11 10:42 AM 03/02/11 10:42 AM
Joined: Dec 2010 Posts: 42 georgia 1 1340busa member
1340busa member 1 Joined: Dec 2010 Posts: 42 georgia	i have a 72 demon 340. when i bought it it had a single plane with a 750 double pumper and a mp508 with a 3000 stall and 391 gears. it ran strong but lacked any power below 4000. i put a crosswind airgap and a 670 quickfuel tech carb on it. it really helped the bottom end. i didnt notice any loss of power on top since i shift at 6600.

Re: Best 340 cam/intake combo [Re: 1340busa] #940751 03/02/11 05:31 PM 03/02/11 05:31 PM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	The 509 is good with 4.56 gears and a stick period. Get a copy of the 68 340 stick cam and with a LD340, holley dbl pumper,4.10s that car will be in the 12s

Re: Best 340 cam/intake combo [Re: Paul_Fancsali] #940752 03/02/11 06:33 PM 03/02/11 06:33 PM
Joined: Sep 2004 Posts: 22,873 Chicken coop dustergirl340 Chicken Little
dustergirl340 Chicken Little Joined: Sep 2004 Posts: 22,873 Chicken coop	that LD340 is a great intake...and a good converter is worth its weight in gold.

Re: Best 340 cam/intake combo [Re: dustergirl340] #940753 03/02/11 10:44 PM 03/02/11 10:44 PM
Joined: Dec 2009 Posts: 74 Oregon D desomod member
desomod member D Joined: Dec 2009 Posts: 74 Oregon	What cam would you suggest with a 6-pak, auto with 3500 stall and 3.91 rear?

Re: Best 340 cam/intake combo [Re: desomod] #940754 03/02/11 10:53 PM 03/02/11 10:53 PM
Joined: Jan 2003 Posts: 6,840 The Swamp S Sixpak master
Sixpak master S Joined: Jan 2003 Posts: 6,840 The Swamp	Comp XE 268 Hydraulic - excellent street cam...swapped out an old street hemi grind for this cam in a 3.55 stick e-body with a 6 pak, car picked up a lot of driveability and bottom end power.

Re: Best 340 cam/intake combo [Re: 392charger] #940755 03/05/11 06:52 PM 03/05/11 06:52 PM
Joined: Nov 2009 Posts: 2,275 Desert Tracker H HYPER8oSoNic top fuel
HYPER8oSoNic top fuel H Joined: Nov 2009 Posts: 2,275 Desert Tracker	Quote: My son wants more power and a bigger cam in his 71 340 Demon. Currently has an old hyd 268 Magnum cam (180 lbs crankng compression)and a Crosswind (Professional Products?) intake. 99% street car with 727 auto, 355 gears, Dougs headers, manual brakes, mopar performance dist, 770 street avenger holley and a mild stall wich power brakes to around 2400. I told him to install the LD340 intake we already have but he wants to put a single plane on it along with a Mopar hyd 508(?) cam/lifter kit while retaining the stock rockers and springs. I'm not sure this would be the hot set and would need new springs at least, so I am asking for your proven combos. Thanks Moparts members You are already on the right path! Tweak the ignition a bit more and "optimize" your present setup, BEFORE you start making other changes. It may surprise you for the better!! The bigger '508 cam and single plane WILL need the higher stall converter and gears to increase performance BUT it will reduce the "streetability" of the combo. Depends on how fast vs how far (in cruising) he wants to go!! "Stupidity is Ignorance on Steroids" "Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)

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