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ChadS
06-11-2005 08:01:59
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Re: 460 tuning help? in reply to 720 gas, 06-10-2005 20:58:47
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38hp? out of a 301? Something is wrong there! I got a C-263 thats over 80, and its only had a stock rebuild. Yes, run a compression check, Stock is somewhere in the area of 170-195psi on a good engine. They are picky on timing, they love 92+ octane gas, dont run it on anything less than 92, cause the will preignite and burn up the valves. Set the timing on the dyno, at 540, that is where you will get peak power. On the carb,, I hope it still has the 715 carb on it, thats the biggest carb available for that engine, it should have a #35 venturi in it, which is good for running 2500 rpms. After running it on the dyno, pull out the plugs,, see what they look like, if they are whitish, or lite in color, you need more fuel, if they are black, then you may have a few problems,, low compression, bad gas, bad valve guides, rings, all of these are what goes wrong in these engines ,and take away alot of power from these engines. That engine should be 80 hp+ easily at 2640 engine rpms,, but, the 460 wont let you dyno the engine at 2640,,, only 1900, or what ever the stock 460 rpms were, the gearing in the pto are different ratios VS the 806, so you may have to tune it at 650 pto rpms rather than 540, its pulling the rpms down too low. Run that compression test, if its under 150, better think about new rings, (if the bores are not worn out) and a valve job. ChadS
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