As most of you guys know, I have been put in the situation of have to rebuild both motors this winter. We decided to do both motors even though I thought my Starboard engine was fine. We did find some of the valves leaking at over 50% and decided to go ahead and tear down that motor also. So far everthing looks good and will be able to use all of my old parts with the addition of some new parts.Since most of us are not sure on what Merc used on the bulldog motors, here is a chance to find out. I will include all the details of what we find as far as original parts and what we will be doing to these motors. Merc did alot of machine work to these blocks. Blocks were clearenced and decked to 3 thousands. The Bulldog motor is actually the Merc 1000sc motor minus the blower, different cam and valvetrain. This is what we have found so far.
Block: GM MK 4 tall deck (cast# 14044807)
Bore: 4.440
Stroke: 4.375
Crank: Lunati
Rods: Carillo
Pistons: JE Forged 8.6:1 Blower pistons
Heads: GM Cast Iron Rec port (cast# 14096188)
118cc open chamber
Intake: 2.19
Exh: 1.88
Intake: Dart
Block: GM MK 4 tall deck (cast# 14044807)
Bore: 4.440
Stroke: 4.375
Crank: Lunati
Rods: Carillo
Pistons: JE Forged 8.6:1 Blower pistons
Heads: GM Cast Iron Rec port (cast# 14096188)
118cc open chamber
Intake: 2.19
Exh: 1.88
Intake: Dart