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250 Supercharge on a 9.5 compression 454

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Old 02-26-2006, 04:42 AM
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250 Supercharge on a 9.5 compression 454

I bet this one will get a lot of varying opinions.

Just ordered a couple of 250 supercharges to install on my twin 454's that have about 50 hours on them. Here's the question. Can you get away with running about 4 pounds of boost with the 250 blowers with a 9.5 compression motor?

Not looking to run all out all the time, just want to be able to create a bit more power when I want it. Currently these 454's are at about 500 hp and hoping to get about 600 to 625 with the upgrade. With the 425 TRS outdrives, I simply don't want to run anymore than that for fear of hurting the drives.

So what are some of your thoughts? Can I get away with this without having to pull the engines and change pistons to lower the compression or is burning a piston inevitable?
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Old 02-26-2006, 10:09 AM
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Default Re: 250 Supercharge on a 9.5 compression 454

Talk to Dean Nickerson. I ran this combo for several years in a 311 Formula with Bravo,s. If your pistons are stock your CR is more like 9:1. You could always use thicker head gaskets to shave a 1/4 point or so off. Joe Murray
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Old 02-27-2006, 06:54 AM
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Default Re: 250 Supercharge on a 9.5 compression 454

Thanks Joe. You know I presumed it was 9:5. The fact is these engines have TRW piston and they are .30 over stock. I couldn't find a part number but they have a slight dome on them. 9:1 would make me feel a little better. How much boost were you running on your set-up?

How would I reach Dean Nickerson. Appreciate the response.

Last edited by alcor; 02-27-2006 at 10:00 PM.
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