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Old 08-01-09, 03:48PM   #1
EC
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Default 550hp street 400 combo?

Since Im bored and just setting around the house with a broken rib I thought I would start a discussion. So, I have been thinking about building another 400 for the street. Im not interested in building a 455 or a stroked 400, just want to build something with a 3.75 stroke crank (since I have a couple setting around). So the question is if you were to build a 400 that needed to run on pump gas, be somewhat street friendly (power brakes), be reliable and an end goal of around 550hp how would you build it. Also trying to keep it somewhat budget minded.
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Old 08-01-09, 11:51PM   #2
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I like that idea myself. I think you could do it with ported Dports but I think SD prepped KRE 290's possibly smaller would be a wise choice to start with. A good set of rods perhaps lightweight I beams from ace. I'd say T2 intake and I'll get back with a cam pick.
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Old 08-02-09, 12:20AM   #3
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Well ported iron heads
T-2 depending on gear and weight, possibly RPM.
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Old 08-02-09, 01:09AM   #4
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How hard can it be to make power from 3000 to 6000 with a 400 and peak power coming in around 550hp, still being able to run power brakes, and be reliable?
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Old 08-02-09, 01:32AM   #5
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I'm just thinking I made 400 hp with HO
03 hyd cam.. Just wondering if you could
make 550 hp with a hyd cam or if it would
have to be a solid or maybe a solid roller?
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Old 08-02-09, 01:35AM   #6
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A 400 I think would need to be at least
in the 6200 rpm range... No?
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Old 08-02-09, 02:07AM   #7
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It could be done with a solid flat. Might be touchy with the power brakes.
Probably Hyd roller would be the best bet.
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Old 08-02-09, 02:35AM   #8
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That's my guess nice hyd roller
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Old 08-02-09, 02:55AM   #9
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I would go with a hyd. roller, I feel they are less maintenance and you can get some decent lift out of them.
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Old 08-02-09, 01:05PM   #10
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What kind of compression are we talking to run pump gas on an iron head 400
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Old 08-02-09, 03:44PM   #11
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9.50 to 9.75
Seems like SD's old faithfull would be close.
You will still need a good exhaust system to make the most of things.
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Old 08-02-09, 03:56PM   #12
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A 400 is not going to be quite as street friendly as a stroker combo at 550hp but with the right convertor and gear wont be an unmanageable dog either.

Compression and cam choice dictate the fuel requirements. You can likely push 10.2:1 range with iron 11:1 aluminum with the cam it will take to make the number.

I dont see making 550 hp at anything under 6000 though.

If you can find a well ported set of iron heads on the cheap use them. You will likely need 250 cfm heads minimum.

Hyd roller ok but a solid flat with say a set of 1.72 Scorpion rockers might be able to get the lift and do better vacuum wise. You could invest in a hydro boost and not worry about your power brakes.

Somewhat off topic but a recent inspection while re detailing my wifes motor the Crower flat hyd cam is still in excellent shape after 5 years 20,000+ miles. Surprising seeing I never took the springs from the solid cam(prev app) off the heads and 145 lb seat pressure. I do use STP with every oil change.
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Old 08-02-09, 05:30PM   #13
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We are running a little under 10.5:1 compression now with our iron 62 heads with no issues on our current 400.
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Old 08-02-09, 05:35PM   #14
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Must be a late intake closing, thus reducing the DCR to help?
Anything coated?
93 octane I assume is bring used.
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Old 08-02-09, 05:47PM   #15
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nothing coated 92 octane. cam has 106 l/s installed on a 104c/l duration is 246/254
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