My 250 engine was standard comp ratio, STD new mahles on STD rods

Nick waples ported head and a cam STD manifolds (efi in) with 55trim t3.48 22psi

252bhp @ 6000rpm

My new one has a slightly reworked head, our own inlet new cam and more boost

Oh obv steel rods and forged pistons

26psi made 303bhp @ 6000rpm and 285 iirc at 6500rpm

It flies in my car really happy with it the old engine was good too though