Looking for Input: Twin 548 BBC Engine Build

Hello all, I am new to the forum and looking for input on my current engine build specific to fuel limitations on the 548's running pump gas (92 octane) with iron heads. I have spoken with many of the local engine builders with mixed opinion, but most of these guys live in the race car world as high performance, offshore, boats are no common in my neck of the woods. I would love to hear from the boating community on this. The engine specs are as follows:



548 BBC

9.8 Deck Height

4.530 Bore

4.250 Stroke

6.385 Rod

10cc piston dome

1.270 Pin height



Merlin "Grumpy Jenkins" iron heads

115.5cc chamber

.039 loc wire gasket



Crane Cam HR 236/359-2S-14 IG

236/244 @ .050

298/306 advertised

114 deg LSA

Intake closes @ 82 deg ADBC @ .004



The math tells me that the static CR for the motor will be 10.27 and the dynamic CR will be 6.81.



So the question; I know that 10.27 is pushing the limit for a static CR but how important is the DCR? I have been told that DCR is more critical and anything below 8.5 will be totally acceptable for pump gas. Am I going to be pushing the limits of this build or will I be able to find a safe area by adjusting timing the compensate for the higher static CR?



Thanks in advance for the input; I am hoping I only have to put these engines together once :)



Reid

Looking for Input: Twin 548 BBC Engine Build