Dynoed my 389, very pleased.
 

Nothing spectacular, but a very nice street motor that will be a lot of fun to drive. 1965 389 with 76 heads built and ported by SD Performance. Crossovers filled, threaded rocker studs, hardened seats installed average 72.5 cc on the chamber, intake flow 230 cfm. Lunati Voodoo 702 HFT cam 262/268 duration @.050 and .468 / .489 lift degreed and installed at 106 deg with 1.5 Harland Sharp rockers. Bored .030 over with Ross custom pistons, 11.8 cc dish for 9.5 compression, Scat rods, Butler Melling 60 psi oil pump. Stock Armasteel crank, turned 10/10. Stock intake lightly cleaned up inside, with a Carter AFB off of a 65 GTO. It made 399 hp, and 456 ft. lbs torque. It will be mated to a Extreme Automatics 200 4R with a 3:73 rear end. One run did show 400 hp, and another showed 460 tq, but i for some reason didn't get those sheets.

The last 2.

Very nice!


:)

Nice...congrats!

Nice hp numbers and a really wide Torque cradle numbers!
With those gears the car should move out with great athourity!

Congrats!

I’d be proud too, super nice 389!

Going to be a stealth fighter on the street, 400 hp is a bunch.

NICE!!!!

Are those 76 heads open or closed chambered?

Those Voo Doo cams sure are becoming popular...

Surprisingly strong for a mild combo I like it. Cam is 219/227 @.050

The cast number 76 he is running is a closed chamber unless Dave who did the porting opened them up?

Cardo, well done!

Impressive

Thanks all. Stealth is what i was going for. Chambers not opened up. Dropped compression with the dished piston. Should be a fun snappy street motor. With that cam, she's all done about 5200 and the trans is set to shift at 4900 for WOT, so it all ended up on the money. Running a 2500-2700 stall converter with lock up. She'll cruise at 70 with the A/C on quite nicely.

Sweet setup and nice torque curve. Those voodoo cams rock.

What would be expected HP given the engine was spinning the water pump, alternator, power steering pump, flex fan, and other as installed street loads (not to the wheels, just engine dyno). Asking to try and put into perspective the engine performance.

Looks like a fantastic engine build.

A 389 is what started my fascination with Pontiac Power
Nice build !!

Makes a small difference.

Last engine I dyno'd we spun the water pump and alternator and used the water pump to cool the engine. The only real downfall to that is you can't cool the engine/spin the pump between pulls while it's shut off.

It's really up to the dyno operator and what is easiest to hook up. But these reasons (and more) are why you see such a big spread between flywheel HP and chassis dyno HP at the wheels.

Nice, 400hp, and 450tq. all with a mild manner package. that should be a fun ride.

Sweet!

Very nice!

Impressive!
imho, your 389 build is quite the value adder for any factory built '64-66 389 4bbl car.