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Old 12-08-2017, 02:25 PM   #1
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Why Iron?

Why are almost all of the replacement short blocks iron now instead of aluminum? Any concerns with iron block and aluminum heads?
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Old 12-08-2017, 02:35 PM   #2
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Type this into Google, and you will have some reading to do:

problems with an iron block and aluminum heads
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Old 12-08-2017, 02:40 PM   #3
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Yup as I expected. issues do to different thermal expansion properties. thank you.

So why are there so few aluminum replacement options with the 3v 4.6L. it looks like FRPP discontinued the aluminum strokers.
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Old 12-08-2017, 03:53 PM   #4
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Because you don't need any aftermarket blocks for the 4.6L or the Coyote. This isn't like the pushrod days where the webbing was not much better than paper mache. Any aluminum 4.6L block will take 800+, even the WAP which ppl seem to think is weak but ask anyone to go find a case of failure where the actual block let go because of insufficient strength and you won't find anything. People use anything from stock iron to teksids to aluminators and even WAPs for big power builds with no issues at all.
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Old 12-09-2017, 01:26 PM   #5
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Why Iron?

Quote:
Originally Posted by swharvey62 View Post
it looks like FRPP discontinued the aluminum strokers.
Unless you can find a company that has one sitting on the shelf. I managed to get a NOS 3V Aluminator block earlier this year. Just have to start calling companies to see if any of them maybe have one somewhere.
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Old 12-09-2017, 01:33 PM   #6
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is this motor an option for replacement? M-6009-A463V can I reuse heads intake and headers?
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Old 12-09-2017, 03:21 PM   #7
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Yes but you'll want the heads gone through and decked. One last time I will recommend a low mileage runner from another Mustang or see if a 4.6L F150 engine would work.
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