![]() ![]() Why the RD28? It is a diesel version of the inline 6 Nissan engine.The rb20det head has alot smaller ports, in fact it flow about the same as the sohc rb30 head It also has a much smaller bore than the other rb series engine that share the same bore You could i guess weld up a rb25 head and recut it to fit the bore of the rb20.For the cams I had to play around a bit, but eventually ended up with 73 for the (this is my first guide, I'd appreciate any feedback if this gets any). ![]() Since the RB26 is turbocharged, it needs a lower compression ratio, around 8.5:1.
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