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Discussion Starter #1
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
 

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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.
 

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Discussion Starter #3
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
 
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