Rb25det piston protrusion CP pistons!

Discuss the RB20, RB25 and RB26 series engines.
RbDatsun280zx
Posts: 2
Joined: Thu Jul 28, 2016 7:43 pm
Car: Rb25det Datsun 280zx 2+2

Rb25det piston protrusion CP pistons!

Postby RbDatsun280zx » Sat Jul 10, 2021 7:21 am

Hi everyone I need help I’m building an Rb25det s2 and needed help i have Cp pistons 9:1 SC7305 and eagle crs-4783-NI rods when I went to check valve clearance the pistons would touch the valves. The block was decked .003” and the head hasn’t been worked on. What could be causing the clearance issue could the pistons be to tall and if I have enough clearance with an .140” cosmetic head gasket would there be an issue other than lowering the CR. thanks everyone in advance.


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