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post #1 of 6 Old June 17th, 2007, 10:55 PM Thread Starter
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engine block

i just bought a 91 gt and the guy that built the car said it had the block out of a 69 or 70 mustang. is there a power handling differance between the older blocks and the block that should have come in the car. if so about how much?
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post #2 of 6 Old June 17th, 2007, 11:19 PM
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Darrell would probably know better than I, I think he is running a retro block, but basically the blocks are somewhat stronger, there will always be an issue with main cap flex though on the two bolt main blocks regardless of age. That inevitably is the weak link.
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post #3 of 6 Old June 17th, 2007, 11:47 PM
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it should also be a flat tappet cam now instead of a roller, unless he did the conversion
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post #4 of 6 Old June 18th, 2007, 12:50 AM
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Did he say whether it was a four bolt or two bolt? The Boss engine was out in '69 & '70.

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post #5 of 6 Old June 18th, 2007, 12:52 AM
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Doesn't appear as though he had. That is why I made the caviat about two bolt mains. If it is an original boss then FTW
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post #6 of 6 Old June 18th, 2007, 03:05 PM Thread Starter
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the guy that had the car built really couldn't tell me much all he did when he had the car built was wright the check. all he could say was it was out of a 69 or 70 and that it had a roller cam in it
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