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Old 10-22-2007, 11:30 AM
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400 Build

There has to be quite afew people on this forum that have built 400's. I have never personaly built a motor and need some ideas. I have a 400 with a 2 bolt main, bored 30 over, overall I'd like to make around 400hp. What are some good ways to make this power? Heads, intake carb, stall?

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Old 10-22-2007, 11:53 AM
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What kind of money do you have marked for this build??

Do you want a daily driver engine??? or more of a street/strip engine??

Is it ok if it makes more then 400hp ??

Pump gas??? 89 or 91???

Keith
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Old 10-22-2007, 11:58 AM
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Ive got about $3000, I want to make a street strip motor that will run on 92 and it can definatly make over 400
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Old 10-22-2007, 04:54 PM
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engine

A real basic combo will get you want you want... I would suggest maybe throwing another $500 at the build to invest in a nice set of aluminum heads.

Get a set of SRP, or KB forged pistons, use the stock rods, resized with arp bolts,stock crank, reground, build it for 10.0 to 10.5 static compression, use a solid roller in the 240@.050 range and 106 LSA. The above mentioned heads and a vic jr or like style intake..

it will take weeks to get the smile off your face.

Keith
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Old 10-22-2007, 07:22 PM
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I know a 406 doesn't have much of a problem making tq. But to increase tq use a rpm air gap, it doesn't seem to hurt top end power either. If you use the right aluminum heads you can make a lot more that 400 horses on pump gas. Weight savings are a plus also.
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Old 10-22-2007, 07:40 PM
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I would at least stud the mains or have 4 bolt splayed caps installed. Make it an internally balanced assembly if you can afford it, if not, at least have it balanced.

400 production blocks are prone to cracking in the cylinders so be very careful to avoid detonation.

If you need to save money in the overall build, you can easily get your HP goal with a solid flat-tappet cam, although proper attention to the cam break-in procedure is a must.

tom
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Old 10-22-2007, 09:55 PM
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Quote:
Originally Posted by k-star
A real basic combo will get you want you want... I would suggest maybe throwing another $500 at the build to invest in a nice set of aluminum heads.

Get a set of SRP, or KB forged pistons, use the stock rods, resized with arp bolts,stock crank, reground, build it for 10.0 to 10.5 static compression, use a solid roller in the 240@.050 range and 106 LSA. The above mentioned heads and a vic jr or like style intake..

it will take weeks to get the smile off your face.

Keith
Keith, I see you recomend the tight 106 LSA. I've always thought the tighter LSA would work better on these longer stroke motors because the dwell time at TDC is shorter than say a 350 or 327 stroke-am I right on this or is there another reason you suggested the 106LSA?

Bob
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Old 10-22-2007, 11:11 PM
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I'd also suggest 5.7 rods with the appropriate pistons.....
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Old 10-23-2007, 05:58 AM
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Quote:
Originally Posted by baddbob
Keith, I see you recomend the tight 106 LSA. I've always thought the tighter LSA would work better on these longer stroke motors because the dwell time at TDC is shorter than say a 350 or 327 stroke-am I right on this or is there another reason you suggested the 106LSA?

Bob

Bob I am glad you saw that...I wanted to typ 108 lsa and not 106....

I personally like the tighter LSA in heavy cars/ street engines because they make the engine more throttle responsive. I am sure with the proper cam that is designed for a maximum race effort a 110 or even a 112 LSA would show a flatter torque curve. Like everything else in a engine there are so many options that the discussion could go on for ever. Another benifit to the Tigher LSA is that the engine will be a little less sensitive to detonation. Like Tom posted those blocks can get thin around the bolt hole notches on the outside of the cylinders. This will be a little added insurance to stave off detonation.

Keith
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Old 10-25-2007, 04:21 AM
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I always liked the 400SB . I also think that it is better then a 383 SB . The only problem's that I had with them is they like to over heat . You can build them wrong and still make big power with them . Just make sure your coolant sys is up to keeping that 400 cool . Let F Bird 88 help you with your build . I think he is the man when it comes to 400SBs .
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