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  1. M

    Calculating prop slip with Rake and Cupping

    Tried a new Solas HR Titan 4 14X21 today on my 1990 OMC Cobra 4.3L 4bbl. Performed pretty well but I think I'd like a little more hole shot so I'm thinking about ordering a 19". I was turning 4400 RPM at WOT with a speed of 52 MPH (GPS and speedo agree). This is with only me on board and...
  2. M

    Raker or 4 Blade?...or other?

    Boat is a 1991 18ft Marada with 1990 (pre balance shaft) 4.3 Cobra. I have added Vortec heads and Edelbrock Performer manifold, 1409 carb, and K&N arrestor. I'm estimating HP around 215-225. Current prop is a 14.3 X 21" Solas "Amita" 3 blade aluminum. WOT RPM is right on at 4500-4600 @ 50MPH...
  3. M

    Prop venting

    I know there are some threads about this but I was hoping for some specific advise from any experts on the matter. I want to drill vents in my prop in hopes of improving my hole shot. Boat is a 18ft I/O about 230hp (apprx. 2700 lbs). Running a Solas aluminum (Amita 3) three blade 21. WOT is...
  4. M

    Do I need a wedge plate?

    Any of you guys that are familiar with the 4.3 upgrade using Edelbrock Performer intake and 1409 carb, is a wedge plate to level up the carb necessary? Just noticed the angle built into my stock 2bbl intake. Thanks
  5. M

    GLM Customer Service

    My new GLM manifolds arrived yesterday and thanks to Bond-o's January 25th post, "My experience with GLM manifolds,....." , the first order of business when I removed them from their boxes was to check the flatness of the sealing faces. Guess what....Not only are the manifold faces not flat...
  6. M

    Exhaust manifolds-Cast iron or aluminum?

    Would like to get your thoughts on this. What are the pros and cons other than the obvious - weight and cost? Are the aluminums worth the extra cost? Looking at the GLMs. Thanks
  7. M

    More Ponies for 4.3

    Sorry to bring up this subject again but I'm hoping to get a few questions answered. Here goes... I have a 1990 OMC Cobra 4.3L V6. It is a roller cam engine with 2bbl carb. and is rated at 160 hp. I have a set of 1996 Vortec heads (with rockers). I plan to buy an Edelbrock intake and 4bbl...
  8. M

    Another OMC 4.3 Vortec upgrade

    OK I'm gonna throw out the 5.7 idea and upgrade my 4.3 to vortec instead. I already have a set of Vortec heads (automotive). Now considering Edelbrock Performer intake and 600 cfm carb (1409). Anybody with experience or thoughts on these Edelbrocks vs stock GM? Is a gain of 45-50 hp pretty...
  9. M

    TorqueShift Prop

    Are these still avilable? Where can I get info? Thanks
  10. M

    Mercruiser engine I.D.

    Hoping someone can help me identify a merc engine. I am considering buying a 350 mercruiser engine to replace my current 4.3L and I'm trying to confirm that it is a roller cam engine. The serial number is OK281645. It has a two barrel carb. All online parts lists I can find indicate that it...
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