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Old 03-02-2013, 01:24 PM
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trying to estimate horsepower and torque slightly built 440

I have a 440 from 1973 that cam out of a winni. I took it to my mopar motor guy and he said it had the good crank and rods. I had him bore it .30 over and installed these pistons
Speed-Pro Forged Pistons ZL2295F30
Speed-Pro Forged Pistons ZL2295F30 - SummitRacing.com
and this cam
COMP Cams Xtreme Energy Camshafts 21-220-4 - SummitRacing.com

it has stock 452 heads on it and stock 4 barrel intake.

I'm trying to guestimate the HP and Torque

by the info here what would you guess?
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Old 03-02-2013, 03:11 PM
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Just a WAG I would say 290 -320. Cam seems small .I would have opted for a cam in the 215 -224 at .050 lift range.
JMO.
You could run a purple cam, but you would need a bit more compression than those 1973 smogger heads will provide.

Glad to see a MOPAR guy around here.
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Old 03-02-2013, 08:04 PM
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lots of 550 hp 440s,in my neighbourhood,bring more. We tried a purple cam in a pick up,it needs more Compression than a pick up 440 has.top end was good
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Old 03-02-2013, 08:12 PM
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thanks for all the replies.

I'm trying to find the info on the compression ratio but I have searched and searched and found different answers.

I have had this motor for a while trying to build the rest of the vehicle.

Let me give a little more info:

It will be run on propane. that was the reason for the cam choice. I remember my motor guy telling me that the pistons I got were domed and would give me a compression ratio of about 10.4:1 Not sure if that is right. but I know that the compression was supposed to be above 10:1. Propane likes high compression since it is on average 108 octane depending on where you buy it.

it will be running the stock exhaust manifold to begin but eventually it will have headers, I was worried about it running out of air so I plan on running this setup for the propane:

IMPCO Propane Dual Twin 2 CT425M 2 425 Holley 4 bbl Throttle Plate 600HP LPG Kit | eBay

Since I already have the two 425 carbs.

Let me know what you think.
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Old 03-02-2013, 08:21 PM
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dual propane mixers with a turbo?
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Old 03-02-2013, 09:18 PM
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HP estimate

You have confused me a bit with your parts list and question. Propane will get different results from a fuel system. Conservative estimate for HP with domed pistons and stock heads...which will be restrictive in flow...will be around 350HP...especially with the cam. May be difficult to get your mix right with the current list of parts. Needs different heads and headers for sure. Propane likes to breathe.
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