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Bbc 454 gen 4 overhaul

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Old 11-01-2020 | 04:47 PM
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Question when u run a blower shouldn't u change pistons to like 8 - 1 ratio
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Old 11-01-2020 | 06:46 PM
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I can't find any good info stating a good blower build
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Old 11-01-2020 | 06:54 PM
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Other than being bored .030 are these pistons direct replacement for stock pistons and should I do anything special to run these with a wieand 177 blower
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Old 11-01-2020 | 07:04 PM
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Originally Posted by Baja 250es
What do u mean by get the tune right ?
Generally speaking, it means getting ign timing and fuel mixture adjusted across all RPMs, load conditions and temperatures to achieve max power/best driveability while maintaining a degree of margin to prevent damage or accelerated wear.. Also includes adjustments for quick transitions from one power setting to another (similar to an accelerator pump on a carb), This is where the WB02 comes in handy.

Edit: Missed the part abt op using a carb. Either way, same principle.

Last edited by zz28zz; 11-03-2020 at 10:49 AM.
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Old 11-01-2020 | 07:14 PM
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Originally Posted by Baja 250es
Question when u run a blower shouldn't u change pistons to like 8 - 1 ratio
Not really. It's all about building cylinder pressure. Starting with a little high compression ratio just means a little less boost to reach a give HP goal.
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Old 11-01-2020 | 07:35 PM
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So if I bought a complete blower setup off a guy on here he had it on a stock gen 4 454 365hp and I rehoned, reringed, rebearing, new oil pump and resealed bottom end went through heads completely and bolted his stuff on i should be ok theoretically speaking
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Old 11-02-2020 | 08:00 AM
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Originally Posted by Baja 250es
So if I bought a complete blower setup off a guy on here he had it on a stock gen 4 454 365hp and I rehoned, reringed, rebearing, new oil pump and resealed bottom end went through heads completely and bolted his stuff on i should be ok theoretically speaking
Theoretically yes, but we don't deal in theoretics. It should be close. Tune it properly or don't do it. Also that engine has low-mid 8:1 ratio.
I believe you have the basic platform of the 525sc.
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Old 11-02-2020 | 08:10 AM
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That's what I was trying to figure out if these pistons were a direct replacement for stock pistons if they were id say that blower setup will work just fine on my engine
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Old 11-02-2020 | 10:16 PM
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Stock compression on a 454mag/365hp is 8.75. You can run 5# of boost with no issues on 93 octane fuel.
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Old 11-03-2020 | 04:46 AM
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Ok cool thank u , Griff that's what I was looking for sorry to be a pain never built a blower motor rather be safe than sorry also what are the best head gaskets to use and any recommendations on valve springs im redoing the heads today and getting checked at machine shop
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