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  1. chelmick

    New camshaft

    I have a new .480 Intake .486 Exhaust 229 Intake / 230 Exhaust duration @ .050 - 110 degree lobe separation camshaft. Will it work in a pre vortec gm v8 for a boat?
  2. chelmick

    Went from 19 inch to 15 inch pitch, gained 200 rpm?

    I have a 1989 Regal 255 XL Ambassador with a Mercruiser 260hp V8. I was running a 19 inch pitch prop but couldn't get above 2600 rpm's. Very slow to plane. So I swapped on a 4 blade 15 inch pitch prop. I get on plane much faster now, but only picked up 200 more rpm. Full throttle is 2800 rpms...
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