1st things 1st
Un hook the Vacc pipe from the gate and replace it as stock and verify that it's hitting the same boost on just the gate no controller plumbed at all.
Can't see that the late 7M's would have any different material used in the blocks compared to a Jz but I'm open to being educated if you have info supporting this?
Pistons better how?
Rod failure isn't an issue with a 7M?
The Head is a much nicer design
I'd hazard a guess that a late...
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