Are the 3.8 v6 blocks the same from 1994 - 2000? - Ford Mustang Forum

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post #1 of 4 (permalink) Old 04-02-2011 Thread Starter
AllenLee's Avatar
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Exclamation Are the 3.8 v6 blocks the same from 1994 - 2000?

I could go into detail (which I might by the end of the thread if I get lots of hits) but the bottom line is I have a 1994 Mustang V6 with a great running engine. I also have a 2000 V6 that threw a rod straight through the block, and I'm looking for a cheap way to get the 2000 back on the road again.
Can I use the bottom end (block, pistons, etc.) of the '94 to rebuild the 2000 with all of it's top end components?

Thanks in advance,

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post #2 of 4 (permalink) Old 04-02-2011
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It will be fine. A lot of people do basically the same thing you are.... they put a 99+ top end on a 94-98 bottom/car to gain the extra power of the split port heads and intake.

Between the 2 blocks you mention, the only difference I know of is the head bolt depth. I read this is an issue for guys who want to run head studs. For regular head bolts they may both use the same ones; but buy bolts for the year of the block just to make sure.

1990 GT 5.0 - H/C/I
2003 GT - bolt-ons, 87 octane, 252/298 rw
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post #3 of 4 (permalink) Old 04-03-2011
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ive heard the same, that they made the head bolt holes deeper to help remedy the head gasket issues in the later blocks.. only issue you would have is if the 00 engine was made in the last half of the year and was internally balanced rather than externally like the 95s.. in either case, use the flywheel or flexplate from the respective block

2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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post #4 of 4 (permalink) Old 04-03-2011
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Pretty sure that 96+ blocks have deeper thread holes. 1994 ws one of the bad years for head gasdket failures due to the shallow head bolts. Just make sure to be extra careful torquing the headd bolts and use new ones. Do not reuse the old head bolts under any circumstances.

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1994 , 2004 , 232 , block , rebuild

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