I'm getting ready to do some dyno testing and tuning on one of my 470 C.I. pump gas 440 motor tomorrow morning, 3.90 stroke with 4.375 bore. It has 9.64 to 1 compression with a set of Eddy RPM heads, the rockers are a set of Harland Sharp 1.54 to 1 ratio rollers. Eddy Performer RPM intake with a 1/2 thick phenolic spacer, 850 CFM Holley 4781-7 carb. It does have a set of 7.1 long rods and a set of forged KB Icon reverse dome pistons in it with almost no quench, .052 between the flat of the piston and the heads The cam is a Comp Cams XE275HL, the dyno is the famous central Oregon Studka dyno (2500 ft. above sea level) with all the latests calibration specs We got the motor mounted and fired up today, ran it long enough to set the timing at 34 BTDC and broke in the cam varying the load to help seat the rings by varying the RPM from 1500 loaded to 2500 with a small load on it, no WOT pulls today ( I had a Dr. Appointment also ) What say you on torque and HP? I'm hoping for 500 + on both HP and torque, actually expecting 550 HP and 570+ ft lbs on the torque, on Oregon non ethanol pump swill I'm planning on testing two different Holley 850 DP(1 4781-2 and the newer 4781-7) and two different heat range spark plugs, a set of Champoins RC9YC and a hotter set of the RC12YC to see which one the motor likes on the dyno I will use the wideban and jet both carbs. for best power and torque. Hoping on everything going well, if so I'll try and post some results tomorrow evening when I get back here Maybe I can learn how to scan and post copies of the dyno sheets also

Hey Cab, what did the heads flow.

I'm very interested in what you find on the plugs, and how easy it is to get those carbs dialed in as I am up in the air between an 800 and 850. Good luck

Good luck with it, I don't have a clue on HP or TQ, but am interested

My official SWAG is... 562 hp and 593 tq.

Just a guess. Stock eddie heads? 498 h.p. 535 lb ft torque

The cam IMO is abit small for the combo, I'll say 510-515hp & 530-540 lb. torque.

800HP for sure

I'm guessing 535hp / 540tq.

Should be close to 540-550 hp I would think and torque could be tricky but I`ll say more than hp.............

I am interested too, as this build is similar to my engine that is still on the stand.
As already asked, what, if any mods to the Eddy heads were done?
I guess 510 HP 525 tq.

Mark

528.5hp
554 lb-ft

Official Guess-top dyno results.
R.

What happened Cab?

Your customer is happy, and you built 550 ft lbs of torque where it will do the most good! I look at that as a pretty big win, based on the fact that you got it from 87 octane?
The expected Hp isn't that far above what you have either, If you tweak it and pick up a few more. Do you think retarding the cam might help?

Greg, I tested that motor with non ethanol 91 octane, not regular Sorry for the misleading comments on him being able to run the motor on regular He wanted a motor he can do burn outs in a 1969 Coronet super Bee That motor , with the proper torque converter, should shred his street tires As far as retarding the cam, all the Mopar motor I've dyno tested and done the testing at the track, didn't like the cams retarded That cam is ground on 110 LSA, I don't have the cam timing notes on that motor now but I think I put it in around 105 to 107 ATDC( 3 to 5 degrees advanced) on the intake lobes I'm anxious to see how it drives in the car I've had 446 and 452 C.I. iron headed pump gas motors( with bigger cams, similars size carbs and intakes) make more HP than this rascal did

Cab, do you think the dual plane intake made the carbs harder to get leaned out?

I said before I'm stuck between choosing and 800 and 850 for my car, and I've heard that the 850 can be troublesome/lack response.

I have another 3.90 stroke 440 block pump gas motor I will test next month, if the money allows that On this one the RPM intake probally limits the peak HP RPM, I looked at the sheets the dyno operator sent me, there hard to read by E mail or Photo Bucket It looks like the motor made 506 HP at around 5700 RPM and 570 Ft. lbs at a RPM I can't read, I'm guessing between 4000 to 4500 RPM As far as the jetting on the 4781-2( the second carb. tested) I had 78 in the front with a 6.5 power valve and 86 in the rear with no power valve and no other mods. I'm aware of or did other than having the choke blade removed. On the first Carb, 4781-7 I did open up the H.S. bleeds to right at .028 or .031, CRS It ended up with 76 jets in the front and 74 in the back with power valves in both metering blocks like stock I think thats the jetting and H.S. bleed sizes, CRS again It really suprised me when the earlier carb did better with stock jetting than the later carb. did I guess that is why we test I will switch manifolds on the next motor, take off the RPM and put on a either a Mopar M1 single plane or my old favorite, the Weiand Team G single plane I'm hoping to get some printed copies of those results soon so I can read all the data instead of parts of it All in all it was a good day, nothing broke and it made 40 more HP than it started out with BTW, making the AFR leaner did reduce the torque but it improved the HP, at the track by using a wide ban gets the same results Leaner is faster than richer. We don't race dyno ,do we My old M.W.stocker out ran the other cars in the same class that had hot spark plugs and a rich mixtture Test, test and test some more, the spark plug and time slip is your freind