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24' Python

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Old 10-10-2011, 12:02 PM
  #11
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Are you still running the cam that Bob designed for the oval heads? It may not be a great match for the 320 heads which are a bit big for a stockish 468 anyway, and they're not a very good head out of the box. What size chambers on both heads? Is your compression lower now too? Before you go crazy chasing boat set up, you might save yourself some time by yankin that motor and running on the dyno. Did you try jetting the carb up a bit yet? It's probably seeing less signal with the big lazy heads and may need bigger jets to compensate. Good luck.
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Old 10-10-2011, 02:47 PM
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I am still running the cam Bob designed for the Oval ports. The 320's are still stock with 118 cc. I should be around 9.6 compression with these heads as I am running a small dome forged piston. With the oval ports I was around 9.6 compression also. I was thinking the other day that my ported Oval ports might be a better head than these World heads. When we dynoed the motor with the oval ports the jetting was fine on the carb and in the boat it seemed to run a little rich. It seems to still be the same with the World heads on it. I am not real good and carbs and don't really know anyone in the area that would be great at it. How do you know if its seeing a lazy signal? Other than reading plugs what else can be done? On the dyno we used a pyrometer on each header tube.

Last edited by cdail28590; 10-10-2011 at 02:56 PM.
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Old 10-10-2011, 04:48 PM
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Call my cell 803-242-0806 about the props.
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Old 10-16-2011, 07:51 PM
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I did some testing this weekend and found out a few things. First off the timing was set to 35 degrees not 30 as I had thought and I checked the plugs which didn't show any signs of running lean. They all had a brownish color on the porcelain and no other issues on the plug itself. After running 3 props on Sat. we found out that the drive is a 1.36 drive and not a 1.5. This was something I had suspected since the boat originally had a blower motor and I have a article that showed a 24 Python that left the factory with a blower motor and 1.36 drive. The cavitation plate on the drive is 3" above the bottom of the boat, so it appears to have a high X.
Prop #1 25p 3 blade quicksilver rpm's 4800 mph 68.3
Prop #2 25p 4 blade Revolution rpms' 4600 mph 69.8
Prop #3 27p 3 blade Mirage rpms 4200 mph 64.5
Prop #4 26p 3 blade Labbed Mirage rpm's 4400 mph 67.6
Prop #5 26p 4 blade Bravo 1 rpms 4400 mph 67.1
Prop #6 24p 4 blade Hydromotive rpms 4700 mph 70.1
Prop #7 23p 3 blade Mirage plus rpms 4900 mph 71.6
The boat handled the best with the 23 Mirage plus as it didn't seem chine walk as bad. The cam is made to pull to 5200 rpm. Should I keep going down in pitch trying to get the rpm's up or just run the 23 Mirage plus? With the 23 Mirage its running a 9% slip. Anybody have any suggestions?

Last edited by cdail28590; 10-17-2011 at 04:47 PM.
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