91 Block the same as 94+? - Mustang Evolution

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Old 11-02-2003, 11:10 AM   #1
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91 Block the same as 94+?

I can get a 91 3.8 block for free and wondering if it would cause any problems with a 94-98 engine if I were to get it bored etc...
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Old 11-02-2003, 12:36 PM   #2
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I am 99.999999999999999999999999999% sure it is the same.
But a free engine is a free engine. Take it!
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Old 11-02-2003, 01:41 PM   #3
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alright I am waiting on Brandon to get me some pics so I can see what condition its in. If its in good condition then its mine.
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Old 11-02-2003, 02:16 PM   #4
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It is the same. there was a change in 88 and from 89 to 95 nothing was done internally again till 96

For you reading enjoyment http://www.babcox.com/editorial/ar/ar90134.htm
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Old 11-02-2003, 02:23 PM   #5
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well crap the next car I get is going to be a 96-97..... what was the change in 96 and will it affect the '91 block
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Old 11-02-2003, 02:26 PM   #6
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basically the block was reinforced in some areas and the heads were changed. There was a casting number change between 96 and 97 but nothing appeared to be changed
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Old 11-06-2003, 12:30 PM   #7
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I believe there is complete compatibility from
89-98 but you must use 96-98 heads with a
96-98 lower intake or mod the intakes to fit the
heads, but it is an easy mod. You also have to
use the same year gaskets as the intakes are.
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Old 11-06-2003, 08:55 PM   #8
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Ok If I sent the block to you what would you suggest the best thing to do with it be
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Old 11-07-2003, 06:04 AM   #9
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Big Bore and forged pistons, stock (forged) rods
High RPM NA use, baby!

SC crank for sale probably, I could use the $$$
and you could use the forged steel crank strength!

I have done lots of measuring and research, I
have found that the bigger bores on a V6 should be very
safe with the proper machining and such, my machinist
has done V6 blocks .060" over and it was great, more is possible.

BV heads and a big cam to top it all off! 1.8 RR's
on top of that and the level 2 springs wil complete the pkg.
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Old 11-07-2003, 09:03 AM   #10
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I thought older blocks, (may its just supercoupes)

Have something different with their coolant lines. Like they had a different coolant line comming out of the block.
Is that true?
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Old 11-07-2003, 09:13 AM   #11
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In the older blocks they had a few extra coolant holes running thru the block and head but a couple were 2 close to the cylinder on the heaad side causing the head problem in 96 they changed the design in 96-97 and futher in 98. Actuall the 98 block is identical to the 99 block minus the new top end stuff
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