Only after several capt and cokes....

I think we messaged about my build.

454 bored .060 over
L2399 pistons- 8.75 compression
Crane 134561 Cam Style: Hydraulic flat tappet

Basic Operating RPM Range: 3,000-6,000

Intake Duration at 050 inch Lift: 236

Exhaust Duration at 050 inch Lift: 246

Duration at 050 inch Lift: 236 int./246 exh.

Advertised Intake Duration: 296

Advertised Exhaust Duration: 306

Advertised Duration: 296 int./306 exh.

Intake Valve Lift with Factory Rocker Arm Ratio: 0.553 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.571 in.

Merc HP500 heads. 2.25 intake 1.88 exhaust

525sc/177blower
dominator carb

Made 572@5600 on the dyno. That was with the engine on the cool side. After the blower got warm, the pulls flattened out to 550-552hp on the later pulls. I have 60 hours on the setup. Runs great all the time, runs even better on cool days. I suspect a chiller is needed on a 177.

Those cams sound good on 454/468. Get as much air in and out of there as possible. You have scoops or enough clearance without. Install extra vents if need be. Intercooler pros and cons.

Howsmit running with that static compression? what kind of fuel?

Runs perfect. I have been told that is what merc should have used with the small blower. I also run 34* of timing. I use 91 non-ethanol. All marinas and many stations have it.

The small or big upper pulley?

I don't know if my pulley is small or big. I do know its 1/2 the diameter of the crank pulley. Makes about 4.5psi to 5psi of boost.

Im full of questions tonight...since I am looking at a 242 without motor... how well does it fit back there?? hatch clearance etc....??

Pm endeavour32
He had one years back and was in and out of the bilge I know that for sure.

My 242 is an 86. It has about 2.5 inches of clearence. If your boat is an 87 or newer, the hatch is a few inches taller than the 86 and older boats.