LT1-LT4 Modifications 1993-97 Gen II Small Block V8

52mm or 58mm TB

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Old 08-23-2010, 05:36 PM
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Default 52mm or 58mm TB

Ok right now I have full bolt ons, with 1.6rr's and just ordered the nitrous outlet 52mm plate kit and plan on spraying a 125 shot, in a year I plan on a AI H/C package, will the 52mm be a restriction in my case? How much hp would I be leaving in the table with a 52mm vs a 58mm? I have a BBK/edelbrock 52mm on my carby the way.
Old 08-23-2010, 06:21 PM
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On a N/A with NOS & Stock internals you should be ok with a 52mm even with a AI H/C. When you stroke them and spin them faster is when you need the bigger TB. Strokers cycle more air though the engine, and when you spin them well over 6k is when the 58mm helps keep intake restriction down. Still depends on the actual setup.
Old 08-23-2010, 06:52 PM
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honestly you have to put a lot of power down to go to a 58mm, you should only switch if your A/F ratio is to low
Old 08-23-2010, 06:52 PM
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Thank you.




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