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i looked up, that rb26 and 26 cams have different timing, even different years of rb25 and 26 have different timing.
First, to prove my theory i lifted the intake cam 1 tooth later and exhaust cam 1 tooth earlier. It worked, compressions raised from 5.5 to 9.5-10bar. Then i fitted adjustable cams to fine tune and now the compressions are 11.5-12.0 all around.
Lookes like you can use rb26 cams in 25 head with hydraulic lifters.
Tomorrow i´m off to dyno and hoping for something around 600hp.
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