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Gas mileage with the addition of heads?

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Old Apr 15, 2008 | 08:21 AM
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Default Gas mileage with the addition of heads?

Currently the Z has full bolt ons and a GT2-3 cam with essentials. I'm looking to add high flowing heads in a couple months down the road and am wondering how gas mileage will be affected with this addition? Right now I'm getting about 16mpg.

Thanks!
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Old Apr 15, 2008 | 08:45 AM
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Good question, Id like to know also.
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Old Apr 15, 2008 | 01:35 PM
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Do a search for AFR heads. Tony Mamo has reported lower emissions and 2-3mpg increases with the AFR 205 heads when they were tested for a Califormia Air Resources Board Exemption Order (basically, emissions legal replacement part).

Your converter probably does more than anything to hurt your mileage.
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Old Apr 15, 2008 | 01:42 PM
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I gained 4mpg with LS2 heads/cam along with a new tune
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Old Apr 15, 2008 | 02:13 PM
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its not so much the heads that hurt the mileage, but the supporting stuff, like stated above. my converter and gears are what made everything noticeable
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Old Apr 15, 2008 | 02:43 PM
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heads will probably help mileage before hurting it
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Old Apr 15, 2008 | 04:18 PM
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If anything I gained with the AFR heads.
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Old Apr 15, 2008 | 04:22 PM
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Originally Posted by hammertime
Do a search for AFR heads. Tony Mamo has reported lower emissions and 2-3mpg increases with the AFR 205 heads when they were tested for a Califormia Air Resources Board Exemption Order (basically, emissions legal replacement part).

Your converter probably does more than anything to hurt your mileage.
Thanks! Thats what I was thinking, I was just curious to how much... anyone know if there are any spread sheets that correlates cams to heads stats for best performance?

I honestly dont know where to start when looking for the right set of heads, Lingenfelter makes a head that they say works good with my GT2-3 cam.
http://www.lingenfelter.com/store/88958665.html
What do you guys think?
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Old Apr 15, 2008 | 04:23 PM
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Biggest reason to gain mpg's from Tony's AFRs are that they use small, efficient intake ports. Its an old school idea that alot (it seems at least) of manufacturers ignore. Supporting mods are going to be the decider as said above. However, really thinking the whole engine out will allow for optimizing engine output and mileage. A good tune will go a long way as well.
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Old Apr 15, 2008 | 04:24 PM
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If you have the dinero go for AFR 205's. Those cnc'd ls6ers do look nice. You may want to look into patriot performances ls6 heads. I've heard good things and their prices are great.
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Old Apr 15, 2008 | 04:33 PM
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I gained 3/4 mpg with my H/C combo. I am running a 11.2 C.R. with my setup and I am sure this is the reason for my mpg increase.Make sure you run as much C.R. as you can with your new heads.Your cam needs the added low speed torque you will get from the higher C.R. I would shoot for at least a 8.5 DCR.
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Old Apr 15, 2008 | 08:54 PM
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I think you gain a few but it depends on the cam and how fast you like to go haha
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