Is 5w-30 still the right oil now it's been forged?
sounds like top end clatter to me.
what was the condition of the lifter bores? these can get badly scored when metal fragment go through an engine.
you say 1 of the valve clearances was tight? why is it tight,what were valve clearances and is there any sign of lobe wear?
just throwing this out there..... wood for the trees etc
have you checked your ac compressor? That makes the car sound like sh1te
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That doesn't sound right.
When I had my Astra VXR rebuilt, relined and a new cylinder, fully forged. It sounds fine. All I can hear is the injectors.
Did you change the lifters? What oil you using? 5w 40 is recommended.
See if you can get a new head.
Regal Inlet Cam, (nice and lumpy idle) Pre Cat Delete, Fully Forged by WG Motorworks (Wosser 86.5mm Pistons, Molnar Conrods, Stem Seal Retainers). Crossover Delete Wtih RAMAIR. Rear Vibra Fast Road Mount, Polybushed front and gearbox mount, MTEC Dimpled and Grooved Discs with Brembo Pads Standard map Goodyears X4 Miltek Catback @ 245BHP