My car be mostly stock.
Top swap, headers, intercooler.
Heads are of unknown mileage.
Stock lifters, pushrods, rockers, comp bolts torqued to 25 ft lbs. Cleaned threads out with qtip, used ARP fastener lube.
tried swapping rockers, no change.
Motor is louder and sounds deeper when the breather is off and it is given a small rev.
Put screwdriver to evap solenoid, not the correct frequency.
Put screwdriver to injectors, possibly correct frequency, seems too fast, but overall very quiet. Could be one loud one... Will swap and see.
Noise is only on front bank near cylinder 5.
Screwdriver to rocker pedestal, only heard bearing noise.
The valve springs appear to be moving at precisely the correct frequency.
To be frank, I can hardly hear it over the bearing noise from the blower.
Oil is M1 5w30 with 800 Km on it.
Was changed at 2000 Km the time before that.
