Hp?

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Mar 18, 2008 | 01:23 PM

Scolesy

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Hp?

I still havent got any kind of anwser as to how much, so i have refined it a little bit. i know the stock 400's have around 169 hp. well, mine is healthy, and it has a Holley 4barrel, i think 700CFM, edelbrock performer intake, free flow exhaust, and an edelbrock cam. how much HP & torque are u guys thinkin, and what about after a set of headers?

Mar 18, 2008 | 02:40 PM

hollenjoe

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what are your exact specs on the edelbrock cam, standard bore? stock pstons? whats a free exaust for you? open headers no mufflers ? anser me that and ill tell ya

Mar 18, 2008 | 03:51 PM

ibleedblue1385

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From: Parma, MI

if you doesnt already have headers on it, i wouldnt call it a "free flowing" exhuast.

Mar 19, 2008 | 12:03 PM

fordeverpower

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From: iowa

i say 220-230hp depending on that camshaft, what are the specs?

Mar 19, 2008 | 04:45 PM

Scolesy8

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From: Ohio

Edelbrock Performer cam and as far as stroke and bore, that is all stock.

Mar 19, 2008 | 08:00 PM

danlee

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From: Delaware

The Peak Horsepower will be around 337@5000 RPM with your setup and headers. The low RPM torque is not great with that cam, it's a mid-to-high RPM cam. You also need to increase the Compression Ratio.

Mar 30, 2008 | 03:57 PM

fordtruck44

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From: Larchwood, IA

I have pretty much the same 400 set up but bored .040 over, what are ways to increase compression, by planing the heads or do i need different pistons? Why should compression be increased? What fuel octane should you run then?

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Mar 30, 2008 | 07:14 PM

danlee

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From: Delaware

Quote:

Originally Posted by fordtruck44

There are a couple of ways to increase the CR. One is to change the pistons. Another is to get closed chamber heads, like Aussie 2V heads or aftermarket aluminum heads. A new set of zero deck pistons matched to a set of closed chamber heads is the best. Then you can get the CR that you need.

When you install a performance cam You increase the lift and duration of the intake and exhaust valves. This improves the ability to get high Volumetric Efficiency at high RPM. It also reduces the effective stroke length and the Dynamic Compression Ratio, as well as increasing the overlap.

You need to increase the Static Compression Ratio by one of the above methods in order to maintain good power at low RPM, when you use a cam of this type.

The grade of fuel used will be determined by the Dynamic Compression Ratio.

I don't recommend milling the heads except for flatness.