It's a full Dart motor, block and marine heads in alloy. 540ci with a pro former Holley knock off 4 barrel. The originally had a 468 BBC with a period (early 80's) Race aero twin turbo setup. When I got it a few years ago it was in barn find condition with a cracked block and no carbs. There was also some rot in the floors, but the hull and stringers were sound.
My engine builder was able to save and reuse the crank and Carillo rods, but everything else was junk. We went with a hydraulic roller cam and he found me a used set of water cooled headers as well as a set of muffler tips and a used mercruiser electronic ignition. I am not sure what the compression ratio is, but the dyno runs were done using the 87. My philosophy is to build a motor for 87 and then run it on premium, that way if I can only get the low octane stuff or if the fuel degrades over the winter, I will still be in the detonation free zone.
The boat is an 83 Campbell 24 foot Daycruiser, one of only 6 made. Campbell practically invented the Daycruiser back in the 60's and sold hundreds of 20 and 22 foot models. Their signature boat however was the 24 foot cuddy cabin of which they built over 300 over the years. Their heavy construction and early Vee hull made them popular for ski racing from Long Beach to Catalina as well as on the western lakes. Having such a big cockpit as well as all the storage under the foredeck make this a perfect scout for Powell where it really helps to go ahead of the slower houseboat to claim a good beach for the night.
Depending upon how I prop it and how heavy I load it, I top out on GPS above 80 mph on a glassy lake. But usually I have 100 gallons of fuel, 200 lbs of German shepherds, and several people as well as beach chairs, canopy, coolers etc. then I run a 5blade that gives about 60 at the top, but cruises in the 30 to 45 range like a big old Cadillac convertible. There is nothing like rumbling through those narrow slot canyons on a warm afternoon....... It's like driving through the Painted Desert or the Grand Canyon, except there are no cars or even other boats most of the time.