HP estimate for mild 340

[Landon]

I'm curious to what this engine may put out and I'm not gonna be able to get to a dyno anytime soon so let me know ur estimate on this mild build!
1973 340 block 0.030 over, externally balanced cast crank with windage tray and stock rods with speed pro forged pistons, 360 J heads with 2.02 and 1.60 valves cleaned up and port matched to intake making approximately 9.4 to 1 compression. Comp cams xe268h, Intake Duration at 050 inch Lift:*224, Exhaust Duration at 050 inch Lift:*230, Valve Lift with Factory Rocker Arm Ratio:*0.477 int./0.480 exh., Lobe Separation (degrees):*110, with hardland sharp roller rockers, 1.6 ratio taking the valve lift too 0.509 int./ 0.512 exh. Topped off with a edelbrock air gap rpm intake, a 670 cfm holley street avenger carb, a mopar performance distributor and a msd 6al ignition box.

 

[bbrroowwnn]

I have very very similar build and specs.....should be about 365 HP and about 400 TQ at the flywheel

 

[Landon]

I have very very similar build and specs.....should be about 365 HP and about 400 TQ at the flywheel

what is ur combo?

 

[doogievlg]

365 hp 385 ft. Lbs

 

[bbrroowwnn]

340 .040 over
externally balanced cast crank stock 3.31 stroke
windage tray
stock rods
Diamond forged pistons
360 J heads with 2.02 and 1.60 valves cleaned up bowl blend
10 to 1 compression
Erson TQ50 Cam
Duration @ .050 228 intake 235 Ex
.472 lift on both intake and exhaust
110 Lobe center
degreed to 105-1/2
stock 1.5 rockers
Stock 340 cast iron intake
800 CFM thermoquad

I dynoed at 346@4900 HP and 388TQ@4500 at the flywheel

I figure I am giving some up to you in your higher lift cam and better intake manifold, even though my compression ratio is a little more....I can post my dyno sheet if you would like

 

[Oldschoolcuda]

Here is my combo Landon that pulled 312 Hp & 337 ft. lbs of torque to rear wheels

1971 340 block 0.030 over, stock forged crank ,stock rods with TRW forged pistons, 587 heads with 2.02 and 1.60 valves, lunati springs & light porting. approximately 10.5 to 1 compression. lunati voodoo cam 226/234 duration @ .050 .494/.513 gross valve lift, lobe separation 110. Factory 273 adjustable rocker arms, rhodes lifters. Edelbrock airgap rpm manifold, eddy 800 cfm carb. Mopar performance dizzy with 22 degrees total mechanical. Running 16 degrees initial. All in at 2600 rpms. Mopar chrome ignition box. Hooker super comp headers.

Oldschoolcuda

 

[tekslk]

Rear wheel alot diffrent than crank.

 

[Oldschoolcuda]

Rear wheel alot diffrent than crank.

Absolutely. Its what counts.

 

[johnnycuda]

How long of a burn out can you leave?
that will tell ya???

 

[Landon]

How long of a burn out can you leave?
that will tell ya???

Haha I can't even do that yet! I'm still in the assembling the car. Thanks for all the info guys! I was hoping it would be around 400 hp but I doubted it. It sure was a hard pulling, strong little engine when I got it with the car 4 years ago and have since then been restoring the car.