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Old 01-23-2013, 10:42 PM   #136 (permalink)
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Join Date: Jun 2008
Location: Saint Louis, MO
Posts: 548

Gascort RIP - '93 Ford Escort Wagon
90 day: 43.01 mpg (US)

WifesCruze - '11 Chevrolet Cruze LT
90 day: 31.1 mpg (US)
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Originally Posted by mystere485 View Post
One of the upgrades ford guys say is upgrading the older first gen modulars with the second gen pi heads. The second gen heads have a slightly smaller cc combustion chamber and the pistons where slightly larger cc. With the head swap and no other mods the compression rises from 9.7:1 to 10.3:1. How high of compression could i go before needing to upgrade from regular to premium octane?
Those modular heads were terrible; the pi heads were worth like +50hp on those 4.6L engines.
Do you still have the plastic "alternator will snap off" lower intake? Those things were one of the worst Ford goofs ever.
"Hmmm, lots of tension on a device? Let's bolt it to something plastic that shouldn't crack and leak!"
I am excited to see if you can do this. I think aeromodding will get you to the mid 30s easily with the 3.08s. (are you sure those are the gears in the car? seems low for an AOD)...I have 3.08s in my '95 GT with the 5spd. I thought all the autos came with 3.55 or something; the racers typically throw in 3.73s into a 5spd, or 4.10s into an auto.
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