.96 or larger at least Dan.
Mine chokes at 300rwkw pretty badly, if I ran better fuel I could get more out of it up high but it's not happy running like that.
I'm seeing 20psi @ 3600 which is way low for an 04z.
The genuine HKS price is a joke I wouldn't pay it.
I also passed on the...
The check valve has to face the right way, if you blow into the booster it should stop flow.
If the valve is damaged or installed backwards when you come on boost it pumps the booster up and you can't push the pedal.
The idea behind Grinding/Polishing/Shot Peening is it removes any surface defects (think dotted lines in toilet paper) then the peening increases surface hardness (before the propeller heads jump up and down YES this is simplification of the process) :icon_razz
All of this just gives the rod...
Dunno you'd have to ring around to find out.
Back in the day I built a rig to do mine so the would all come out pretty much the same as this makes the final balance much easier.
(picture a linishing belt that runs on it's side)
You do however need someone that knows how to shotpeen them...
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