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84LX89GT · 04-10-2003, 10:34 PM

The 4.2's have a longer stroke crank, and most kits use the crankshaft, rods and pistons out of a 4.2L V6 truck engine (same engine), while others charge more and upgrade everything to forged. Also, i believe you'd have to get your engine block clearanced for the longer throw of the crankshaft. I believe the bottom end of a 4.2L truck engine will bolt right in with your cylinder heads and intake manifold with no problems. There's alot of info out there in the internet, so hopefully people can be more helpful than i am

04-10-2003, 10:34 PM	#3
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	The 4.2's have a longer stroke crank, and most kits use the crankshaft, rods and pistons out of a 4.2L V6 truck engine (same engine), while others charge more and upgrade everything to forged. Also, i believe you'd have to get your engine block clearanced for the longer throw of the crankshaft. I believe the bottom end of a 4.2L truck engine will bolt right in with your cylinder heads and intake manifold with no problems. There's alot of info out there in the internet, so hopefully people can be more helpful than i am __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)