Mr.Duster

I was wondering if anyone could tell me what type of heads and intake would be good for a 340 block?

theomahamoparguy

Wow,you really know how to open a bag of worms. Cheap but good would be a set of 360 heads [72-79?] and an edelbrock performer RPM air gap manifold.

67 GTX

all depends on what you want to do with it

Red Devil

what he said, give us more info on what you want to do and we can help you more

Mr.Duster

id like to drive it on the street as well as on the strip. Something that would be able to keep up or beat the big blocks.

chlngr1970

360 heads with the full port/polish and a good 3 angle valve job, Performer RPM or LD340 with a MP 284/.484 cam, Holley 750 Vacuum secondary carb and TUNE, TUNE, TUNE! That with a good set of gears you should be able to take on all comers...in an A-Body, right?

j

78D200

don't forget a shift kit, posi (sure-grip), some thick solid sway bars, and a set od wide sticky tires.

Mr.Duster

ya its all for a 72 duster. thanks i think a buddy of mine has a set of 360 heads for it. how much u think the cam will run me for?. i was looking and i seen they have new front ends for them to handle better any of you think i should stick to the stock but beef it up a bit or swap it out.

Red Devil

you will have to look online for the price of the cam depending on what you go with.

Mr.Duster

I might go with MP 284/.484 cam and a 750 mechanical secondary for the carb.

Mr.Duster

do you guys think i should find another 340 to work over cause the motor and trans thats in it now is original.

theomahamoparguy

well, depends how much the car is worth, you know like options and such.

If you're worried, I'd just go straight for a 360 motor. They're easy to find.

Is this car special in any other way like high impact color or alot of options.

67 GTX

if your worried, a 360 is your best bet

Mr.Duster

im not to sure of the options yet i didnt get to fig. out all the stuff on the pin but ill post it soon as i take a look. I might go with a 360 then.

67 GTX

good choice

Mr.Duster

heres my fender tag srry i didnt post it sooner been kind of busy. vsx en2, m21,n23 n41, n42, r11, v6x, hb1, u , b51, g15, L25, L31, hb1, c4x9, tx9, c13, 540813, E55, d34, vs23, h2b, 264515. i fig. out the basics it has a 340 its a duster, where it was made and that but im having a hard time trying to find out the options on it the build sheet is missing to the car

Red Devil

here is what I got, hope it helps
CodeDescriptionE55340-4 Barrel 69-73
D34TorqueFlite Automatic Transmission
VS23V = Plymouth Valiant / Duster
S = Special
23 = 2 Door Hardtop

H2BH = 340 240HP(net) 1-4BBL 8 CYL
2 = 1972
B = Dodge Main, Hamtramck, MI, USA
264515 Sequence Number '264515'
HB1 Paint Code: Light Blue
C4X9 Trim Grade/Style/Color
C = Charger
4 = Vinyl Split Bench w/ Center Armrest
X9 = Black
TX9 Upper Door Frame: Black / Black Velvet
C13 Date Built: 12 / 13 / 1971
540813 Order Number: 540813
HB1 Roof Type OR Color: Light Blue
U Built to Specifications for USA Order
B51 Power Assisted Brakes
G15 Tinted Windshield Only
L25 Trunk Compartment Light
L31 Hood / Fender Mount Turn Signal
M21 Roof Drip Rail Moldings
N23 Electronic Ignition 72 only
N41 Duel Exhaust w/o Tips
N42 Chrome Duel Exhaust Tips
R11 Music Master Radio AM
V6X Black Longitude Sports Stripe
VSX Unknown At This Time
EN2 End of Codes Assembly Line 2

Polaradude

Nice job Red.

Mr.Duster

hey thanks red that helped alot.

1 Bad Mirada

ive run a wide variety of small valve heads and different cam setups in my 340 mirada.

ive run the 484, 508, and 528..i stuck with the 528. with 1988 360 heads with a light porting job and a port matched edelbrock airgap, roller top end, headers.. i ran 12.40s @ 108ish in a 3600lb car. stock stroke, 30 over, BG lawsuit carb with a proform high flow center. oh, and im running around 9 to 1 compression...

in the demon i have a 340 with 1973 340 heads, stock bore and stroke, stock fuel system and ignition system...508 cam, ld3400 intake, 750 holley, it weighed right around 3000 and ran 13.50s @ 101 ish. i also ran the 484 cam in that engine, and it didnt run as well as the 508, although i dont have times for that cam. this is also a fairly low compression engine.

the 360 can be had MUCH cheaper than the 340.

Mr.Duster

well iw ent a different route for now. i got an ld4b intake and didnt get the carb yet. i pulled off the heads and needs some cleaning up(ill get pics up in a bit). the rocker arm shaft on the 340 heads have the oil holes pointing up there supposed to be down right? if so the guy that rebuilt the motor didnt do it right. even when they did the pistons there looks to be a hair bit of rust in the cylinder walls not to sure yet didnt get to look at it closely.

Mr.Duster

well its not as bad as i thought it does have the cross hatch pattern and it is bored .030 over so that is a plus and the rust isnt deep probably just little 600 and it will be fine

chlngr1970

If you have the the heads rebuilt, make sure you have the hardened seats installed. You need those, unless you use a lead substitute with every fill up.

j

Red Devil

yeah that is a good point, I like your thinking chlngr

Mr.Duster

i took the valves out of one of the heads they are all new just one seat was hammered in and messed it up but we grinded it some and got it to seat.

67 GTX

but, this isn't a necessity
i have heard of heads going ten of thousands of miles without the lead, and stilll being ok

mr340

When I get home this weekend I'll snap some pics of what happens when the rebuilder doesn't install hardened seats....

67 GTX

i would like to see that

Mr.Duster

ya i def. dont think mine are harden seats.

mr340

It ain't pretty, and possibly not repairable, i might have a nice paperweight on my hands...