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Old 04-06-2011, 01:48 PM   #28 (permalink)
comptiger5000
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Join Date: Feb 2010
Location: CT, USA
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RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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^ That'll do too. If you don't mind pulling the heads, thinner head gaskets will bump the compression up a little, which helps both low end torque and thermal efficiency.

The key with headers for a build like this is they must meet certain criteria: equal length primaries, clean merge, long primaries, primaries not too big. If the primaries are too big and/or too short, they won't build as much low end.
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Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
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