![]() I would think you're going to be on the money at more like 32 or 33 degrees. I also think if you're running your stock heads that your timing may be too far advanced if it's 36 degrees total advance based on your post. and adding aftermarket really isn't worth much if anything in terms of power. ![]() the load required to displace water and overcome the friction is just too great.Īlso, the thunderoblt ignition system is a good ignition. incremental changes in power don't make major changes in speed in a boat. 350 horse 327 L79 (Chevelle-Chevy II part 3863151) Flat Tappet Hydraulic cam specs: Valve Lift:0.447' Intake /0.447' Exhaust Duration. that would require an increase of over 100 horsepower. if gear ratio is constant and we assume that slip doesn't change much, a change from a 17" prop to a 21" prop and pulling the same engine rpms equates to somewhere around 12 miles an hour increase in top speed. The factory bump stick in a marine engine really isn't so bad that only a different cam is going to make a dramatic change by itself. dry headers and aftermarket heads are a different story. spit pattern would probably be a good bit better. I agree on single pattern cam - especially with anything that looks remotely like a factory exhaust system. that's a decent cam and should make a good amount of power, but if you've got factory heads that'll be the main bottleneck to making much additional power. What I have says stock merc flat tapet cam pn 431-5943 that was put in most 350s is: 0.05 duration (intale/exhaust) 200/212, lift.
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