340 horsepower

[h340]

is it possible to squeeze 500-550 hp out of a j headed stock stroke 340 with say 11:1 compression, h beam rods,forged pistons and balanced rotating assembly. also maybe a solid roller and j heads that have been prepped to the max say from shady dell speedshop. i only want to keep j heads because of the visual factor of a sleeper like the rest of my car.

thanks

chris

 

[AdamR]

My 340 made 480hp at the crank with iron heads.

1973 340 block
* decked to +.020 deck height(pistons above deck)
* bored .030 over
* Ross flat tops with max weight removal option*** and .927 pin bores* B&B tool steel wrist pins, 2.500 X .927 X .090 wall(piston and pin 525g)
* OE rods bushed to .927, fully polished, resized, lightened, ARP bolts
* OE steel crank( reground, strokes equalized, indexed)
* Milodon deep pan
* Melling oil pump
* double roller timing set
* Crower 262/265 @ .050, .575/.585 solid lifter cam
* Crower lifters
* ported 587 heads with MP 2.02/1.60 valves, milled for true 11:1 CR flow 260/173 at .600 lift
* bronze guides and hardened exhaust seats
* Crower dual springs
* Comp 10deg retainers and machined locks
* Edelbrock Victor intake, gasket matched, mild plenum mods
*HVH 1" spacer
*Profrom 750
* Harland Sharp 1.5 roller rockers and HD thick wall shafts
* Crane pushrods
* MP moly coated fuel pump eccentric
* MP OEM replacement 340 damper

 

[duster340]

i am not the one to tell how much power you can get out of that kind of motor, but at that power level i think anykind of sleeperimage is totaly destroyed as soon as you twist the key and it starts up, my rollercamed, J headed 340 where rattling windows all over my neighbourhood as soon as it was started up ;) with a 800-900 unstable idle there whas no way to make a misstake on the power

 

[340mopar]

My 340 in my Valiant is about 500-550hp. It runs 11.20s @ 121 @ 3150lbs race weight. Which is about 435 at the tires.

'73 340 block (half filled)
4.10 bore (old heavy TRW pistons .060)
3.31 stroke (stock 318 poly)
Eagle SIR rods
X heads, mild porting 2.05in / 1.625ex
Comp Cam roller, .630 in / .631 ex lift - 252in / 258ex duration @ .050
Compression approx 14:1
Dual 660 center squirters (the right single four would be just as good on power)


Chuck

 

[388dart]

is it possible to squeeze 500-550 hp out of a j headed stock stroke 340 with say 11:1 compression, h beam rods,forged pistons and balanced rotating assembly. also maybe a solid roller and j heads that have been prepped to the max say from shady dell speedshop. i only want to keep j heads because of the visual factor of a sleeper like the rest of my car.

thanks

chris

425 - 450 and keeping with your sleeper look, maybe - 500-550 not a chance. you can hear it coming a 1/2 mile away and to make use of it, especially street driven will mean a lot of modifications I doubt you want to make as you have a good looking car. M2CW.

 

[AdamR]

425 - 450 and keeping with your sleeper look, maybe - 500-550 not a chance. you can hear it coming a 1/2 mile away and to make use of it, especially street driven will mean a lot of modifications I doubt you want to make as you have a good looking car. M2CW.

You mean my motor isnt going to sound stock with that 11:1 compression and big solid cam ?

 

[AdamR]

h340, that car looks great, what size tires are on the back?

 

[388dart]

You mean my motor isnt going to sound stock with that 11:1 compression and big solid cam ?

Depends on what type of ear plugs you use!!

 

[moper]

Can it be done? Sure. At 11:1? possible. But like they said...no sleeper there at all. The problem becomes the power will be at an rpm peak around 6800 rpm. So it will be sluggish around town under 4500 unless you run the big stall convertor and steeper gears.