how much boost can you put in a C5R block (427ci)? I have a D1SC with 11psi and it makes 715 WHP, but planning on changing the unit to F1C and we probably see 15psi.

It's not really boost thats the issue its overall horsepower and torqe. 1000+ HP is certainly not unreasonable with a C5R block.

I have logged 22lbs threw my C5R 427 with an F2. With proper compression for the build, and good tuning, you will be fine. :cheers:

I have logged 22lbs threw my C5R 427 with an F2. With proper compression for the build, and good tuning, you will be fine. :cheers:

what is the compression of your C5R and HP