Feel like my 440 should be faster

[318willrun]

My favorite old saying is Mind over matter, I don't mind and you don't matter.

 

[PRH]

What size converter would yall recommend for my setup? If I ended up going to trick flow heads one day would that same converter still be applicable? (which I believe have a smaller chamber volume and would raise my compression to about 10.2:1)

I will definitely be going to at least 3.73 or even 3.91s out back this winter.

If you’re looking for a big move in the seat of the pants feel, the TF heads and a good 9.5” or 10” converter is the right call.

 

[standup303]

How many miles on the engine now.

Is the carburetor opening all the way with the accelerator pedal? Need 2 people to check this.

Are the secondaries opening fully or at all? Maybe you are driving a 440-2bbl.

About 500 miles on the motor. I’ll have to check the carb this weekend. Thank you

 

[standup303]

The thing about the CR is………at that high of an elevation, the CR is “effectively” less.

After you do a cranking pressure test and have a real number to look at.
Use the Wallace cranking pressure calculator to see how close it is.
Then change the baro pressure to something that represents being closer to sea level.
The cranking pressure number will go up.
Now, start lowering the CR until the cranking pressure number is pretty close to what you’re seeing from the test.
Whatever CR you used to come up with that result is basically what the effective CR is at your altitude.

Edit-
So I ran the numbers on Wallace…..
Current baro reading(station pressure) at Denver airport is 24.79”.
For a 446, 9.38cr, int closing point of 67abdc, and 24.79” shows 121psi gauge pressure.
At 29.50” it would be 144.
For the gauge to read 121 at 29.50” the CR has to drop down to about 8.25:1

Thanks for running those calcs. I’m going to run a compression test this weekend

 

[standup303]

How fast was the car with the previous 360 engine? Was it a stock 360 or modified?
Will play a big part in your perception of what is "fast".

Not sure the details on the build, it wasn’t anything crazy. Big cam, Victor intake, stock heads, fairly “tired” motor. However in retrospect, good engine.

 

[68Bee]

What size converter would yall recommend for my setup? If I ended up going to trick flow heads one day would that same converter still be applicable? (which I believe have a smaller chamber volume and would raise my compression to about 10.2:1)

I will definitely be going to at least 3.73 or even 3.91s out back this winter.

3.91 & at least 3000stall converter. Heads would definitely help, but rear gear first is a good idea.