Yes, You have been clocked at just under 55 now.
I just read your other thread. Sorry, been out of town. Not trying to be a dick. The dizzy, LOL never heard it called that before. You are right on the money about combustion chamber design, deck height and quench. I built a small block chevy 350 and hogged out some 305 closed chamber heads (as a teenager) before I really knew what I was doing. I ended up with 11 to 1 compression, and a doctors bill for removal of metal from my eye from all the grinding. Motor Ran Good, had to always leave the automatic tranny in gear to shut it off (to prevent engine run on). I also had to pony up for a high dollar gear reduction type starter. Bugger wouldn't start when the factory starter got hot. It got great mileage. Last project was a small block 400. Used longer rods from Summit, flat top pistons and Trick Flow Aluminum heads at 10.5 to 1 with no problems. Aluminum dissipates heat better than iron and you can get away with a bit more compression. Ran into a big problem on the final valve adjustment, adjusted five or six valves and then I couldn't turn the motor over by hand. One of the rods interfered with the lobe on the camshaft. Had to disassemble the motor and take it back to the machine shop to have them clearance the rod(s) and re-balance the entire assembly. The only other option was a small base circle cam and they only make them with solid lifters, unacceptable for my daily driver.
I like the idea of installing longer rods. Smokey Yunick Power Secrets -"Install the longest connecting rod possible that will still allow a good ring package".
I do not know what pistons the 3.7 is supposed to have. My guess would be a small dish. Mercruisers idle great and have pretty small cams as a rule. Beware, if you make too much power you will end up breaking that Alpha drive.
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