See post # 6

500EFI cam is a Crane hr cam with 230/236 at .050”, 114 LSA, and I believe 612lift ?

Edit in:

Some edelbrocks have 110cc chamber, some 118cc depending on the model. Even with the 110cc, youll likely be sub 9:1 with a flat top

A stock 454 with zero machining puts you barely over 8.6:1 with those heads. Use the summit calculator to help figure out where you’ll be.
https://www.summitracing.com/popup/c...ion-calculator

Dont forget most bbc flat top pistons have about a 3 or 4cc valve relief

True dat. If he has the larger chambers it won’t even make it to 8:1

He would most likely have a 4.320 bore. Won't make much of a change though.

I just built 2 454's with the above mentioned cams. They sound great and seem to make good power. Merc 420's with upgraded HR cams. I will be running 87 octane with the little mini domes that were in the 420's.

You can follow my build thread if you’d like. Same heads and a video of the cam running.

Guess the new power game!

Have Dana exhaust. How much dome will I need. The 12cc SRP’s or?. I’m open to a good proven recipe

why is it Or what makes it more marine friendly