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Old 07-07-2021, 06:03 AM
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steve25 steve25 is offline
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The 5c or the 6X if they are -4 castings are are nearly identical, but for the 5 series heads having a bit less Intake port volume which is not a bad thing if your stuck running 3.08 rear gears or less.

If I am not mistaken that 7J2 head had no center Exh port divider extending out from the head bolt to the flange.

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Old 07-07-2021, 06:58 PM
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noalibi noalibi is offline
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Thanks for all the responses. i brought the 400 YX block and heads to the machine shop today. heads are 6X-8's going in my 66 GTO. i want a good drivable torquey street driver i will be running a holley sniper EFI, so next question is suggestions on the right pistons and camshaft to match this setup.
??

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Last edited by noalibi; 07-07-2021 at 07:17 PM.
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