Shaving the head does slightly decrease the distance between the cam gears and tge crank gear, which i believe could make it difficult to set your camshafts perfectly with the crankshact (due to the set length and number of teeth on the timing belt). If the underlying cause of your problem is the camshafts (specifically the exhaust cam) not lined up correctly with the crankshaft, a set of adjustable cam gears can fix that problem.
I do not know how much material needs to be removed to cause the gears to not line up.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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