Im also guessing it could be lack of compression...
but i have CTR pistons in B18c block, that should give me at least 11.8:1 or 12.0:1 in compression ratio. Head was shaved by 3 thou and block was decked by 5 thou. But i am only getting 225 psi for all 4 cylinders... does it sound abit low? cuz ive compared with another stock jap spec B18cR motor and he has got 250psi with all 4 cylinders. Anyone with similar setup can tell me what sort of compression reading u r gettin? thx!
p.s how much does it cost to port out the intake manifold?