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Old 05-09-2006, 05:48 PM
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Supercharging my 400sbc

Hey guys, I was thinking of putting a weiand pro street supercharger on my 400sbc thats pumping out around 470hp with 10.5/1 compression and hypertecnic pistons. But I'm unsure about a couple of things. I have steel conrods and a steel crank, both made by eagle and rated at about 500-550 hp. Will they be able to withstand 700 hp? Will I need to go with a billet crank and conrods? What about my pistons will I need forged steel pistons?

Also I was thinking of putting a 6 speed behind it, will a 6 speed be able to handle 700 hp? I also still have the chevy ten bolt rear end. Now I've heard before that they can handle a 9 second car, is this true?

Any help is appreciated.


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Old 05-09-2006, 10:11 PM
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No you do not need billet rods and/or crank. Superchargers are not that rough on parts. The main problem I see is your compression. 10.5:1 is too high for a pump gas roots blower.9:1 would be my max upper limit. You can probably get by with 10 oe 10.5:1 if you run water/alky injection along with a timing retard, the problem is if you are out and about and run out of water/alky and you are running pump gas, you will be in the detonation zone. Water injection helps a LOT but, I would want to have to depend on it at all times.

Your pistons are also not up to the task. If you can find a set of dished pistons and get a blower friendly cam, you will be in good shape. Might be a little hard finding off the shelf pistons to get you to 9:1 (or even 8.5:1 would be good) with a 400.

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Old 05-09-2006, 10:36 PM
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I'm currently running about 4.5-5psi with a 142ci Weiand blower and about 9.8:1 compression. I usually run about 5 gallons Trick 114 mixed with about 20 gallons of 92 octane though.
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Old 05-10-2006, 12:26 PM
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Originally Posted by Blazin72
I'm currently running about 4.5-5psi with a 142ci Weiand blower and about 9.8:1 compression. I usually run about 5 gallons Trick 114 mixed with about 20 gallons of 92 octane though.

Cameroman hit it dead on. Why do all this work just to skimp out because of pistons. Just do it the right way and get it down 8:1 or so. Sure Blazin72 has almost 10:1 but hes only pushing 4.5psi with a little 142ci. Try a nice big old pro style blower putting out 10psi with 10.5:1 and see what happens to those hyper pistons.

By the way your math is off, Just for kicks here, I'm assuming you got to 700hp by thinking that a blower adds 50% to the current 470hp motor. The problem is that motor is not set up for a blower. The 40-50% is a ballpark figuer used by companys to market blowers on stock motors. That motor you have may drop to 400hp or even less! once you set it up properly for the blower.
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Old 05-12-2006, 06:31 AM
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These guys are right on. Dont half way do it in favor of a cheaper, easier build up. Spend the money on some lightweight forged, dished pistons. There are several companies that make a nice deep dish piston that does not kill quench. Weisco, SRP, JE are some I know of for sure. I would also take a look at the cam specs. Wrong cam will damage power potential.
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