christoner2002
Petty Officer 2nd Class
- Joined
- Jun 27, 2010
- Messages
- 139
I have a 1997 Larson 206 SEI, with a Mercruiser 5.7, Alpha one Gen 2, with a 1.62 ratio drive. Engine has the older style, non vortec centerbolt heads, and was originally a 2bbl and was rated at 210hp. I swapped to a 4bbl intake and a Edelbrock 1409 600cfm carb. This engine will be finding a nice spot in my garage to stay safe, in case it ever needs to go back in.
I am building another engine for the boat this winter. The new engine is a 10243880 2 bolt main 350 block, std bore, with a 14088532 forged steel crankshaft, Speed-Pro +6cc dish pistons, and a set of fresh vortec heads with a valve spring kit from alex's parts, giving the heads ability to take up to a .550 lift. The boat has only thru Prop exhaust, and I am not really wanting to change that.
The cam I am looking at is the Comp Cams Xm270hr, with lift of .495 intake/.503 exhaust, 112 lobe separation, and 270 intake/276 exhaust duration. Thinking of matching that up wit a Edelbrock RPM Air gap manifold. Does this seem reasonable for a thru prop exhaust?
Next will be the Oil Pump. Should I run a Standard oil pump? I thought I remember hearing that a high volume will pump to much oil to the top end under higher rpm for a extended stretch, like a boat does. What do you think is my best option?
I have read the warnings of not giving a Alpha wide open throttle starts, and not getting the prop out of the water. And will be adding a drive shower, and running synthetic Mercury gear lube, like I always have. Any insights will be a great help. Thanks for looking
I am building another engine for the boat this winter. The new engine is a 10243880 2 bolt main 350 block, std bore, with a 14088532 forged steel crankshaft, Speed-Pro +6cc dish pistons, and a set of fresh vortec heads with a valve spring kit from alex's parts, giving the heads ability to take up to a .550 lift. The boat has only thru Prop exhaust, and I am not really wanting to change that.
The cam I am looking at is the Comp Cams Xm270hr, with lift of .495 intake/.503 exhaust, 112 lobe separation, and 270 intake/276 exhaust duration. Thinking of matching that up wit a Edelbrock RPM Air gap manifold. Does this seem reasonable for a thru prop exhaust?
Next will be the Oil Pump. Should I run a Standard oil pump? I thought I remember hearing that a high volume will pump to much oil to the top end under higher rpm for a extended stretch, like a boat does. What do you think is my best option?
I have read the warnings of not giving a Alpha wide open throttle starts, and not getting the prop out of the water. And will be adding a drive shower, and running synthetic Mercury gear lube, like I always have. Any insights will be a great help. Thanks for looking