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post #1 of 3 (permalink) Old 02-28-2010, 07:10 PM Thread Starter
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89 sc

Hello I havent been around for a while but in journeys i ran across a ford mechanic lookingt to sell his 89 sc with a 4.2 crank i bought it for 550 he gave me the parts to swap the brakes over to a normal booster setup anyway my question is what are the gains of the 4.2 swap or did i just by a normal sc thank for any and all help

94 sc NEW
4.2 crank borlas 2.5 pipes from headers back 5% od pully
89 sc parts car need somthing let me know
The journey of life isn't to arrive at death perfectly preserved but to slidein sideways yelling "DAMN" what a ride
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post #2 of 3 (permalink) Old 02-28-2010, 10:20 PM
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Well you will gain some more torque and HP but you trade in your forged 3.8 SC crank for a cast 4.2 crank. Now I will say I am unaware of any crank failures to date. You will also need to readjust your blower if you want the same boost level due to the extra displacement.

If all else fails get a bigger hammer!

93 SC Tbird
MPII w/ Plenum,90mm MAF, 85mm TB, 40# Injectors, 255 lph FP, Double IC w/fan, SCT Chip (Tuned by Jerry),3/4" Raised Top, F52-TT TC, SilverFox AOD 550, SPT-R VB
96 1/2 XR7 Sold and Salvaged
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post #3 of 3 (permalink) Old 03-01-2010, 01:14 AM Thread Starter
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THe owner before me was aord mechanic and did the crank swap on the slow over nights at the ford delar what adjust are needed

94 sc NEW
4.2 crank borlas 2.5 pipes from headers back 5% od pully
89 sc parts car need somthing let me know
The journey of life isn't to arrive at death perfectly preserved but to slidein sideways yelling "DAMN" what a ride
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