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How Much HP Are Gils Costing Me

Old 10-20-2016, 09:31 AM
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Default How Much HP Are Gils Costing Me

Plain and simple, how much HP are the factory high performance gils costing me? They are one of the only parts I re used from the 454 mags I pulled out at the urging of a few people saying not worth the upgrade to another manifold as they are a decent piece. Just built two fresh 540's, NA that are producing about 700hp per side on the engine dyno with their dyno headers. I just can't seem to get a solid answer. Engine builder thinks probably not much, maybe 20hp vs a higher performance header, but that was just a guess. If it's a big spread I think I'd like some EMI Thunders.

Thanks Guys!

Last edited by hotstang46; 10-20-2016 at 09:37 AM.
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Old 10-20-2016, 11:30 AM
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The Gils are fine. Look at the Lighting header web site,they used to have some dyno comparisons
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Old 10-20-2016, 11:34 AM
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This graph was done by Fountain.
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Old 10-20-2016, 03:00 PM
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Exactly what I needed, thank you so much!
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Old 10-20-2016, 03:04 PM
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On an NA 540 700 hp engine I'd guess the Gils make 30-50hp less.
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