Dyno numbers are in.

[Mark1972]

For anyone who had read my posts over the last 6 months regarding my 440 build, I said I would post numbers once it was dyno'd. I posted the engine info below. I'm quite happy with the numbers, especially the torque.

Block bored .030"
Align bored
Decked
Factory cast-iron crank ground .010" under
New SCAT H-beam rods
Keith Black pistons(10-1)
Eddy RPM intake
Eddy E-Street heads (75cc chamber's)
Engine balanced
Doug's headers
CompCams XE268H cam and lifters
Melling M63 HV oil pump and pick up
Carter M6903 fuel pump
ProBillet distributor
MSD wires
440Source 6 quart oil pan, windage tray.

So, the dyno shop used a Holley 750 DP. But I don't yet actually have a carb for this engine. My plan was to use what ever the dyno shop used, but I've been told vacuum secondary would be better. This car will pretty much live between idle and 4000rpm, with 3.55's. I have to send the dyno data to the transmission shop Monday so they can make the converter, and am not sure what rpm stall it will be. I'll let them decide that, but the carb is still up in the air. Seeing the dyno data, any thoughts?

 

[BSB67]

Can't really read the data.

 

[Nate S]

First I’d go with a Holley, far better adjustment options. The 750dp they used wouldn’t be bad, could even get their jetting figures. If you want evil throttle response and don’t mind spending a bit more get an 830 annular discharge. With the auto though, I’d be looking at a VS probably. Best bet is a properly rebuilt 3310-1. This has the down leg boosters, secondary metering block etc. Could upgrade a new one too but not quite the same.

 

[Mark1972]

Sorry, a little blurry for some I guess.
488HP @ 5400rpm
565TQ @ 3200RPM
The torque curve was nice and flat, starting at 3200, and staying above 500 through to 5000.

 

[BSB67]

Very nice. I like the 750 DP.

 

[66Satellite47]

Depending on the converter you choose, I think a DP can be made to work just fine for a Street/Strip application with those gears, a 446 cube, that cam. A double pumper may take a bit of tuning effort to get it right. It takes working the shooter sizes(front & rear) & the pump cams. And of course the jetting. A good old 3310-1 is a great choice too. The 3310 will likely need a bit of tuning also. 750 size is a good start. A bigger cam may like the 850 better. Just my opinion.

 

[slepr1]

These 440's sure are consistent. My 440 build is almost identical to yours and produce the same numbers.

 

[Curiousyellow71]

Looks great Mark!....You shouldn't need too much convertor with all that torque. 3.55s a 24-25k stall works nice.
For a more economical option and a great driving carb...its hard to beat a good rebuilt 72-75 era thermoquad, 500 hp is right in the sweet spot for a TQ.

For tuning it's hard to beat a 4150 dp, but they usually are not bolt on carbs and take some tuning...we've never been able to just install one an go.
Get this beast in the car ASAP!

 

[Mark1972]

Way ahead of ya Curious. The 318/904 is out as of 10 minutes ago, and now I'm going to do the engine compartment properly, and paint it the color of the car. So I've got lots of masking and sanding to do to be ready for shooting it next weekend.

 

[beanhead]

Wow that's a great turnout. I've seen 'bigger' builds not make much more than that. Were the heads ported? Should be a real fun street car!

 

[Mark1972]

Thanks Bean. The heads went on as shipped from Edelbrock, after an inspection of the heads and checking the valve job. Even the engine builder was a little surprised at the dyno numbers.

 

[khryslerkid]

Sorry, a little blurry for some I guess.

If you click on the picture it will clear up. It's the way it works on here with pics.

Nice results Mark

 

[BSB67]

Wow that's a great turnout. I've seen 'bigger' builds not make much more than that. Were the heads ported? Should be a real fun street car!

Don't race dynos. It never works the way you think it should.

 

[wyrmrider]

A lot of heads do not make enough in the street lift range to make a difference
PRH posted on ported iron heads vs CNC and the Iron were better below .500 if I remember correctly (lot's a luck with that)

 

[YY1]

what cam?

 

[threewood]

Nice! Engine dyno or chassis dyno?

 

[Mark1972]

CompCams XE268H
Engine dyno

 

[Bee1971]

Seems to Bee a norm with these Comp XE Cams

5200/5400 RPM s and they are done fast after that

 

[Mark1972]

I've not seen any other dyno tests with this cam in a similar motor. When I sat down with the engine builder I stressed idle to 4000 was where 90% of my driving would take place. It would be interesting to see how my results would change if I had a single plane intake. Maybe the HP would continue to rise past 5400?

 

[YY1]

Quick google lists RPM range starting at 1600, so not truly "idle".