HP Estimate

Does any one have an estimate or prior build dyno sheet for an old school motor?

Just a ski Boat motor 1969 19 wooden deck miller V-drive flat

72C velvet drive 12% 11.5 x 15 Stellings

Engine Specs

bbc 427 + 060= 440 ci

Rect Port Closed Chamber Heads Dated 1966

Valves 2.19 1.88 blended [replaced 1.72 ] 11/32 stem

Ports cleaned up bowls blended 105 cc chambers

Chambers cleaned up exhaust quench area laid back

Log exhaust no snails 3" Thru hull

11.1 cr mixing 91 and 110 [97-98 octane Mix]

Camshaft

Solid Flat 264-273 @ 050 0.635 lift 108 LC set up @ 102 Ultradyne Cam

Wieand T-Ram 700 Double Pumpers if i can get to run upstairs

idle 900 in gear midrange good haven't dialed top end yet setting up o2 sensor to dial in winter project

Prior 660 4224 6500+ rpm

MSD Billet 6T Box

Timing Locked out at 38 using starter saver to start

Bottom End

Chevy Forged crank

Scat Rods

2 bolt mains



First post just looking for info not ready yet to build full throw done motor.

Ski at least once a week might build 496 have most parts heads are the issue?

Any info would be helpful

HP Estimate