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Old 01-01-2015, 07:00 PM   #1
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Question head swap

Alright i have a 97 4.6 gt im thinking i can but want someinput will the 01 model mach 1 4 valve heads bolt on
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Old 01-01-2015, 09:48 PM   #2
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You'll lose compression. Just build from scratch and use the appropriate pistons.
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Old 01-01-2015, 10:13 PM   #3
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Well im going to be adding a turbo in the next month so that won't matter

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Old 01-01-2015, 10:30 PM   #4
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Then yeah..they'll bolt on
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Old 01-02-2015, 12:31 AM   #5
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More than just a head swap then you are building for boost.

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Old 01-02-2015, 10:07 AM   #6
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Are you going to be running relatively low boost? If you are going to run over 8/9 psi then I don't see why you get the 4v head when you can just max out the engine internals strength with boost anyways?


I could be wrong, but you probably cant put more than 400 rwhp with the stock rods and pistons. You can hit 400 rwhp pretty quick if you have a good turbo. Instead of getting the 4v heads, I would upgrade your clutch, rear end, or rods so that they are ready for boost.


I probably sound like too much of a nay-sayer though. a 4v head swap is cool no matter what you're set up is and the HP gains from it will be doubled if you boost it at 15 psi
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Old 01-02-2015, 04:17 PM   #7
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Yeah I'm not going to be thrown no big 15 20 psi boost into it maybe 10 psi max right now and I'ma be rebuilding the engine like internals later on just want to start getting the cheaper stuff right now

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